Why is apparent power not measured in Watts? Appropriate translation of "puer territus pedes nudos aspicit"? 1 Answer. Now, the value it should return after passing a variable of (int) to it: This website uses cookies to improve your experience while you navigate through the website. For example, for a 32 bit computer the pointer size can be 4 bytes and for a 64 bit computer the pointer size can be 8 bytes. The size of a short pointer is 8 bytes! Why size of pointer is 8 bytes? That address is 8 bytes. Performance cookies are used to understand and analyze the key performance indexes of the website which helps in delivering a better user experience for the visitors. The sizeof operator doesn't care where the pointer is pointing to, it gives the size of the pointer, in the first case it just gives the size of the array, and that is not the same. Why is pointer size 4 bytes in C? By clicking Accept All, you consent to the use of ALL the cookies. Arrays are passed by the reference and this division will only give you information how many times size of the pointer is larger than the size of an integer, but not the size of the object referenced by the pointer. rev2022.12.9.43105. But opting out of some of these cookies may affect your browsing experience. Usually it depends upon the word size of underlying processor for example for a 32 bit computer the pointer size can be 4 bytes for a 64 bit computer the pointer size can be 8 bytes. Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Your machine seems to have 64 bit addresses, and thus, each address (and hence, each pointer) is 64 bits (8 bytes) long. Why is this reference of a pointer a rvalue? An 8-byte procedure pointer refers to an active procedure through teraspace. In 32-bit system, the size of a pointer variable is 4 Bytes whereas in a 64-bit system, the size of a pointer is 8 Bytes. You need to return two values from your function - the buffer pointer and the length of the buffer. Thus, pointers to all types of data occupy the same size of memory because the value of a pointer is the memory address - an unsigned integer. Usually it depends upon the word size of underlying processor for example for a 32 bit computer the pointer size can be 4 bytes for a 64 bit computer the pointer size can be 8 bytes. [duplicate]. For example, i can get the first value of array using kkpointer[0]. For instance, most computers have an address space of 4GB. Copyright 2022 it-qa.com | All rights reserved. If you have a 64-bit system with 8-bit bytes (and it sounds like you do), probably all pointers will be 8 bytes in size. This cookie is set by GDPR Cookie Consent plugin. You seem to work on a machine where int has a size of 4 bytes, so the row has size of 3*4 . Why is the compiler loading this pointer from memory in a loop. It is useful as it can specify how many bytes of memory is occupied in memory. would suspect that there are 8-byte integer types as well as 8-byte pointer types, in addition to 4-byte integer and pointer types. Why use a pointer to a pointer in this 'handmade list'? rev2022.12.9.43105. Character pointer in C. Why is the WSARecvMsg function implemented as a function pointer and can this pointer be reused? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. Which method of the Component class is used to set the position and size of a component in JSP? the operand. Why is this Pointer to Constant Pointer assignment Illegal? Others are equally sure that an int has 32 bits and sizeof (int) is 4. Who is right? a[0] is an integer and the standard only gives an indication of the minimum max value it has to store. You can compare each byte in a string to the byte the pointer is pointing at. Belows are simple code that compares size of array itself and size of pointer to array. Why does this work? Note, the size of the pointer is actually different on different architectures. Therefore, for a pointer to be able to store any memory location in this computer it should be 16 bits wide,i.e, 2 bytes(8 bits=1 byte). If you do pointer arithmetic, the compiler does for you the size calculations. Why is this pointer needed when calling std::call_once()? The following table shows how 8-byte and 16-byte pointers compare. Hence the size of char pointer, int pointer, float pointer, NULL pointer etc are all same. operand that has array type, the result is the total number of bytes in the array.103) When This cookie is set by GDPR Cookie Consent plugin. The bit types in a machine are nothing but memory address, that it . I don't understand why this function "returns a pointer from the list". Better way to check if an element only exists in one array. Normally, it depends upon the word size of underlying processor. What is size of pointer in C on DOS? And 3 bytes on a 24-bit system. Thanks for pointing it out! signed char, (or a qualified version thereof) the result is 1. Should teachers encourage good students to help weaker ones? No. When you take a pointer to it, the pointer just contains an address of memory (integer) without knowing or caring what this address contains. Because the void pointer is used to cast the variables only, So pointer arithmetic cant be done in a void pointer. The width of the memory address/location depends on the computer architecture. MOSFET is getting very hot at high frequency PWM, Effect of coal and natural gas burning on particulate matter pollution. . The bit types in a machine are nothing but memory address, that it can hold. The size of void pointer varies system to system. For size of a pointer I would mean the number of bits (or bytes) necessary to hold that pointer in memory, or send its value . Your uses 64 bits (8 bytes). Most systems access the stored data not byte-wise, but word-wise: A word is basically just multiple bytes.How long a word is (i.e. I added the explanation to the question. The example can be confusing to the understanding of the concept. so as you can see, when applied to the array, it gives the total bytes. . On 8 bit Arduinos the memory address range is a 16 bit value, so a pointer will always be 2 bytes. Most modern implementations use 32 bits (4 bytes) integers. Most modern implementations use 32 bits (4 bytes) integers. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Is the size of a pointer always equal to four? It technically could be anything of whatever size. How to smoothen the round border of a created buffer to make it look more natural? The size of a pointer in C/C++ is not fixed. Why does this work? What is difference between uninitialized (wild) pointer and null pointer. Would salt mines, lakes or flats be reasonably found in high, snowy elevations? I am learning C++, and read that when an array is passed into a function it decays into a pointer. How to set a newcommand to be incompressible by justification? Python string to an integer or an integer to a string This program for sorting array in c allows the user to enter the Size and the row elements of One Dimensional Array. Why the size of pointer is 8 bytes? Count decimal numbers in a string using the standard library. Sed based on 2 words, then replace whole line with variable. Why is the array size of a pointer 8 bytes? The cookie is used to store the user consent for the cookies in the category "Analytics". This is where the 32-bit, 64-bit, etc. Debian/Ubuntu - Is there a man page listing all the version codenames/numbers? We do not currently allow content pasted from ChatGPT on Stack Overflow; read our policy here. The size of the pointer basically depends on the architecture of the system in which it is implemented. > According to cpp reference, a pointer in 64 system is 8 bytes cpprefrence is talking about the data models in common use; the size of pointer referred to is the size of pointer to object. In practice, pointers will be size 2 on a 16-bit system (if you can find one), 4 on a 32-bit system, and 8 on a 64-bit system, but theres nothing to be gained in relying on a given size. Pointers are pointers. It can also depend on the compiler but this is beyond the question. When you take a pointer to it, the pointer just contains an address of memory (integer) without knowing or caring what this address contains. Administrative unit (AU) pointer Points to the location of the J1 byte in the payload (the first byte in the virtual container . Why does this ternary result in a pointer being printed? The size of any pointer is always 8 on your platform, so it's platform dependent. Example: char *x - pointer to char. The size of pointer variable is independent of the data type of the variable it is pointing to because at the end it is pointing to a memory location. What exactly does it depend on? It can also depend on the compiler but this is beyond the question. Shouldn't they be the same? @0___________ hm, I don't want to language-lawyer this, but I don't think. The 'char' data type in Java originally used for representing 16-bit Unicode. However, the variables to which the pointers point to . Necessary cookies are absolutely essential for the website to function properly. @APM500 because all pointers are the same size, regardless of their type. For most DOS compilers that depends on the memory model you use to compile. Basically, the size of a pointer is whatever the implementation says it is. Why does this function pointer assignment work when assigned directly but not with the conditional operator? . How big is a pointer in a 32 bit system? The cookie is set by GDPR cookie consent to record the user consent for the cookies in the category "Functional". applied to an operand that has structure or union type, the result is the total number of ILP32 and LP64 data models and data type sizes. However memory models are a DOSism or at least processor related, and not part of standard C. A good place to discuss this is comp.os.msdos.programmer. The values of pointer variables are unsigned integer numbers which are addresses of other variables. Why the size of pointer to array is always 8 in C? Why is the federal judiciary of the United States divided into circuits? (This is just to illustrate the concept, in the example in the question, a[] is an integer array but the same logic works with anything). Ready to optimize your JavaScript with Rust? The size of the pointer depends on the system and implementation. It does not store any personal data. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Why are all pointers 8 bytes? A huge pointer has a size of 4 bytes or 32-bits and it can access up to 64K size in memory. Copyright 2022 www.appsloveworld.com. I cannot figure out why a takes up 8 bytes, but a[0] takes up 4. Thought one thing, and typed the other! How is the merkle root verified if the mempools may be different? How many Array type function parameters are one of the biggest lies ever produced by a programming language. Can virent/viret mean "green" in an adjectival sense? These cookies ensure basic functionalities and security features of the website, anonymously. It can be anything from 2 bytes up. A pointer is just a pointer. String and Int are different data types and hold different values. Some people are certain that an int has 16 bits and sizeof (int) is 2. I meant the value stored in the array could be anything, using a random array as an example to illustrate the point. integer constant, When sizeof is applied to an operand that has type char, unsigned char, or You have a 64-bit machine with a 64-bit address word, which happens to be 8 bytes. 2 Answers. A pointer is just a memory address, which because of how many . Note that all pointers are 8 bytes. For example the size of a pointer in 32 bit is 4 bytes (32 bit ) and 8 bytes(64 bit ) in a 64 bit machines. Why use iterator_traits in a template function instead of just using another template type argument? Usually it depends upon the word size of underlying processor for example for a 32 bit computer the pointer size can be 4 bytes for a 64 bit computer the pointer size can be 8 bytes. If the computer architecture is 16-bit then it means that it can have 2^16 memory locations. In contrast, there are many types of 16-byte pointers. We use cookies to ensure that we give you the best experience on our website. Does integrating PDOS give total charge of a system? comes in. Finally, there are CPUs in which integers and pointers are stored in different registers while being used by the CPU. And 3 bytes on a 24-bit system. Why does access a pointer in a union this way cause segmentation fault? However, you may visit "Cookie Settings" to provide a controlled consent. A void pointer is a pointer that has no associated data type with it. Since one byte is equal to eight bits, 64 bits / 8 = 8 represents the size of a pointer. It can be anything from 2 bytes up. The sizeof operator doesn't care where the pointer is pointing to, it gives the size of the pointer, in the first case it just gives the size of the array, and that is not the same. As 1 byte = 8 bits, it follows that words on these systems count 64/8 = 8 bytes per word. Why this return a const X* const pointer within a const method? IIRC, x32 uses 32-bit pointers in long mode on the x86-64. How to say "patience" in latin in the modern sense of "virtue of waiting or being able to wait"? In the normal case, the size of the pointer is determined by the architecture of the platform your compiler is running on. What is the size of a pointer in C / C + +? sizeof(a)/sizeof(a[0]) will not work on the function parameters. On some microcomputers the address space is only 64K, so 16-bit pointers are used. a [0] is an integer and the standard only gives an indication of the minimum max value it has to store. That address is 8 bytes. If the system is 64-bit, size of void pointer is 8 bytes. pointer in C stored address of Memory so its size depends on machine on which your C program is being compiled . utf8) SPONSORED Why are . Virtualization doesn't have anything to do with it. Why using a pointer of this as default parameter to a function not allowed? Usually it depends upon the word size of underlying processor for example for a 32 bit computer the pointer size can be 4 bytes for a 64 bit computer the pointer size can be 8 bytes. Why do American universities have so many gen-eds? The size is determined from the type of Why would you use a void pointer in this code? Is there a verb meaning depthify (getting more depth)? Site design / logo 2022 Stack Exchange Inc; user contributions licensed under CC BY-SA. Are there conservative socialists in the US? We also use third-party cookies that help us analyze and understand how you use this website. If you add 1 to the current row address, you get the address of the next row. It depends upon different issues like Operating system, CPU architecture etc. Pointers generally have a fixed size, for ex. Your uses 64 bits (8 bytes). . You have a pointer to an. 2 Answers. For example: I want to know why i got '8' instead of 400. Hence Java uses Unicode standard. How to use Shamir Secret Sharing Class in Crypto++, boost.filesystem create_directories throws std::bad_alloc, Xcode project won't display std::string in debugger anymore. This cookie is set by GDPR Cookie Consent plugin. Whatever the compiler chooses to make it. Size of pointer in c is machine dependent but using sizeof() operator you can find it. Size of Pointer in C is useful for determining the memory space occupied by the machine. a[0], on the other hand, is of the type that an element of that array has (an int), and that type has 32 bits (4 bytes) on your machine. The parameter is adjusted to be a pointer type. To subscribe to this RSS feed, copy and paste this URL into your RSS reader. For example, a pointer on a 64-bit system will be 64-bits, which is 8 bytes. Because of how CPUs are implemented, it's often faster to address memory at power-of-two offsets from a base address. The size of any pointer is always 8 on your platform, so it's platform dependent. Carl Norum 212185. score:3 . Does balls to the wall mean full speed ahead or full speed ahead and nosedive? In this post, we are going to explain how to kill chrome driver background process or release chromedriver. As is, it is not related the the size of the integer. It depends upon different issues like Operating system, CPU architecture etc. This behavior brings further confusion between arrays and pointers novices always encounter. The size of the pointer depends on the system and implementation. Where does the idea of selling dragon parts come from? The size of a void* pointer is the address size of the CPU, as it has to be able to hold any possible memory address. If you continue to use this site we will assume that you are happy with it. A pointer which can point to any segment in the memory is known as a huge pointer. How to print and pipe log file at the same time? "Arrays are passed by the reference" is an unfortunate choice of wording in C++ (where references are a separate thing from the pointers you get from array->pointer decay). Why are C++ iterators required to return a reference? For this reason, if you have an array of 3-byte structs, the compiler will add an extra byte of "padding" (i.e. There are some exceptions, like on old 16-bit windows when you had to distinguish between 32-bit pointers and 16-bit. Static constant character pointer and why it's used in this fashion. The fact is that if you read words which are 32 bits length (4 bytes, lw ), then two consecutive words will be 4 bytes away from each other. . Your uses 64 bits (8 bytes). expression or the parenthesized name of a type. Thus, pointers to all types of data occupy the same size of memory because the value of a pointer is the memory address an unsigned integer. It's not an array. Functional cookies help to perform certain functionalities like sharing the content of the website on social media platforms, collect feedbacks, and other third-party features. pointer stores memory address as its value,so if you are using 64bit system then the size of memo . why is this filename parameter a char pointer instead of string? Size of pointers to (non-static) member functions could (would typically be) larger. A void pointer can hold address of any type and can be typcasted to any type. It depends upon different issues like Operating system, CPU architecture etc. Except for function parameters, where what looks like an array is a pointer.:(. C++11 is a version of the ISO/IEC 14882 standard for the C++ programming language. 1980s short story - disease of self absorption. C++11 replaced the prior version of the C++ standard, called C++03, and was later replaced by C++14.The name follows the tradition of naming language versions by the publication year of the specification, though it was formerly named C++0x because it was expected to be published before 2010. The only types of 8-byte pointers are space and procedure pointers. Your operating system is not relevant. These cookies will be stored in your browser only with your consent. How many transistors at minimum do you need to build a general-purpose computer? void* is not a pointer to object type. On a 32-bit Machine, sizeof (int*) will return a value 4 because the address value of memory location on a 32-bit machine is 4-byte integers. This is where the 32-bit, 64-bit, etc. Why size of pointer is 8 bytes? @ngKhi because we need to know what it points to so we know how to interpret what is at the address. By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. So, you may be wondering, "What does the sizeof( ) operator do?" The sizeof( ) operator in C is used to find the memory its operand occupies in the computer's memory. A pointer is just an address of memory where the start of the variable is located. automatic registration of object creator function with a macro, Cannot compile C++ code with Netbeans 7.0 on Mac OS, Redirecting printf C++ console output to C#, Compiler improperly includes files in same directory. Making statements based on opinion; back them up with references or personal experience. Cooking roast potatoes with a slow cooked roast, Books that explain fundamental chess concepts. Did the apostolic or early church fathers acknowledge Papal infallibility? A pointer takes 8 bytes of memory to get stored. For a 64-bit system, it has to be (at least) 64 bits. a[0] is a variable in the first place of the array. Arrays are passed by the reference and this division will only give you information how many times size of the pointer is larger than the size of an integer, but not the size of the object referenced by the pointer. @JonathonReinhart fortunately it doesn't care about the pointee, or else it would be useless. When opening a snapshot in dotMemory, the snapshot overview page will tell us about WPF binding leaks . If you build. All rights reserved. An unsigned integer is allocated 4 bytes of memory for its storage on a typical 32-bit system. on a 32-bit executable theyre usually 32-bit. On 32-bit machines, pointers correspondingly take up 32 bits / 8 = 4 bytes. How do I increase localStorage in Chrome? and if you run your code on 64bit machine then size will be 8 bytes (64 bits) . With this input, I was expecting this function to print 1, as I thought a would be an integer pointer (4 bytes) and a[0] would also be 4 bytes. Size of binary value preserved when cast to pointer: 8 bytes: 4 bytes: (For example, the 68000 line of CPUs has a set of "D" registers for data, and a @MarcusMller It's just bit of a nitpick. Modern platforms (like the latest iPhones and Macs) are 64 bit systems where 64 determines the number of bits per word. Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. The size of a double pointer is 8 bytes! It could be a char or it could be a double, or a nested array. Before explaining the reason for size of an empty class, let's understand the meaning of empty class in C++ Programming. But it is evaluated at compile-time. Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? In this case, you would add 4 to the address of the first word to get the address of the next word. Can a pointer be void? All pointers. Quora User Knows Italian 1 y Joe Zbiciak I have been programming since grade school Author has 5.2K answers and 36.5M answer views 3 y a [0] is an integer and the standard only gives an indication of the minimum max value it has to store. The values of pointer variables are unsigned integer numbers which are addresses of other variables. Qt set a custom widget inside a QTableView cell, CMake generates SHARED library but not STATIC library, How to properly use shared_ptr in good C++ APIs. It technically could be anything of whatever size. What determines the pointer. C program to print the size of the pointer: C // C program to print the . an extra unused byte whose value nobody uses) so that it can use a multiply-by-4 to fetch items from the array. Connect and share knowledge within a single location that is structured and easy to search. Are the S&P 500 and Dow Jones Industrial Average securities? Why does "weak.lock()" return "nullptr" with the definition of "auto weak=std::make_shared(42);"? All pointer types take same number of bytes for a compiler. Thanks for contributing an answer to Stack Overflow! Note, the size of the pointer is actually different on different architectures. In the above memory block-If the pointer 'ptr' is stored at . why does this pointer arithmetic on a 2D array work? It doesn't have to be 4 in 32 bit systems. size is for which platform you have built your program. C++ pointer to objects which go out of scope when function returns - why does this work? In the case of an STS-1, the frame is 810 octets in size, while the STM-1/STS-3c frame is 2,430 octets in size. a Win64 program the pointers will be 64 bits. First, there is no guarantee that the size of a pointer is bigger than an integer and secondly, the size of a variable determines what the range of numbers it can represent, a bigger size can hold a wider range. Other uncategorized cookies are those that are being analyzed and have not been classified into a category as yet. Why does my stock Samsung Galaxy phone/tablet lack some features compared to other Samsung Galaxy models? The size of a pointer is the size of this address. Here is an example to find the size of void pointer in C language, Example Live Demo The cookie is used to store the user consent for the cookies in the category "Performance". Not the answer you're looking for? a[0], on the other hand, is of the type that an element of that array has (an int), and that type has 32 bits (4 bytes) on your machine. 8 What is the size of a pointer in C / C + +. sizeof(a)/sizeof(a[0]) will not work on the function parameters. If you see the "cross", you're on the right track, Books that explain fundamental chess concepts. The size of a pointer in C/C++ is not fixed. The size of a pointer in C/C++ language is not fixed. The size of a long pointer is 8 bytes! If the system is 16-bit, size of void pointer is 2 bytes. I could understand that the first value is 400, but second one,, i think that it also should be 400 because as i assigned a pointer that points to array, kkpointer, it kinda acts like name of array, which is const address value. When applied to an It depends upon different issues like Operating system, CPU architecture etc. In practice, pointers will be size 2 on a 16-bit system (if you can find one), 4 on a 32-bit system, and 8 on a 64-bit system, but there's nothing to be gained in relying on a given size. In this case, sizeof( ) is a unary operator that is applied to a single operand as follows: We know that the addition operator is used to add two numbers together. Asking for help, clarification, or responding to other answers. This is usually done by passing an extra integer pointer parameter: If the system is 32-bit, size of void pointer is 4 bytes. Pointers have their own size irrespective of the type of data they are pointing to. Casting integer to function pointer in signal code - why does this work? For a 64-bit system, it has to be (at least) 64 bits. Having said that, pointers to intrinsic data and to objects should always be the same size on a given architecture. These cookies track visitors across websites and collect information to provide customized ads. The size of the pointer depends on the system and implementation. This is a quote from 6.5.3.4, 2 N1570 draft For example the size of a pointer in 32 bit is 4 bytes (32 bit ) and 8 bytes(64 bit ) in a 64 bit machines. Similarly, on a 64-bit machine it will return a value of 8 as on a 64-bit machine the address of a memory location are 8-byte integers. Analytical cookies are used to understand how visitors interact with the website. Your ptr defines a pointer to an array of three int s (i.e. Usually it depends upon the word size of underlying processor for example for a 32 bit computer the pointer size can be 4 bytes for a 64 bit computer the pointer size can be 8 bytes. Your uses 64 bits (8 bytes). Find centralized, trusted content and collaborate around the technologies you use most. Because of this reason we see the size of a pointer to be 4 bytes in 32 bit machine and 8 bytes in a 64 bit machine. The cookies is used to store the user consent for the cookies in the category "Necessary". For STS-1, the frame is transmitted as three octets of overhead, followed by 87 octets of payload. Having said that, pointers to intrinsic data and to objects should always be the same size on a given architecture. Most modern implementations use 32 bits (4 bytes) integers. It can be anything from 2 bytes up. Why is std::string constructor resetting GetLastError, cannot write a space using ofstream, but endl works fine, OpenCV_FOUND to FALSE so package "OpenCV" is considered to be NOT FOUND. Why can't I pass the this pointer explicitly to a member function? comes in. It depends upon different issues like Operating system, CPU architecture etc. Why is this attempt to pass a pointer from C++ to Fortran not working? The result is an integer. That is why we get 4 for both ptri and ptrc. The size of the pointer basically depends on the architecture of the system in which it is implemented. (This is just to illustrate the concept, in the example in the question, a[] is an integer array but the same logic works with anything). Browse other questions tagged, Where developers & technologists share private knowledge with coworkers, Reach developers & technologists worldwide. Therefore the size of the char data type in Java is 2 byte, and same for the C language is 1 byte. please let me know. To be more precise, with a pointer of 16 bit the maximum memory you can have is around 65 KB. Connect and share knowledge within a single location that is structured and easy to search. The size of the pointer depends on the system and implementation. Why does a pointer behave like this in c++. build a Win32 program the pointers will be 32 bits. Why would Henry want to close the breach. 7 What is the size of a pointer of type class? Out of these, the cookies that are categorized as necessary are stored on your browser as they are essential for the working of basic functionalities of the website. I think they just didn't realize 64 bit systems have eight byte pointers (a lot of older C++ teaching materials still assume everything is a 32 bit system). No. In practice, pointers will be size 2 on a 16-bit system (if you can find one), 4 on a 32-bit system, and 8 on a 64-bit system, but theres nothing to be gained in relying on a given size. Ready to optimize your JavaScript with Rust? But if you pass a pointer, then the result will be the size of it's type. size of pointers in c language. What is the process of editing and deleting the record from the database? @Deduplicator gahh I know that. If the type of the operand is a variable length array No definition shows the exact type referenced by the pointer. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. It can be anything from 2 bytes up. Why doesn't the pointer for the char *str change when we reverse the string in this function? Why size of pointer is 8 bytes? Does standard C++11 guarantee that memory_order_seq_cst prevents StoreLoad reordering of non-atomic around an atomic? Your machine seems to have 64 bit addresses, and thus, each address (and hence, each pointer) is 64 bits (8 bytes) long. However, the size of a pointer on a 16 bit system should be 2 bytes. Unless it isn't, which only happens for VLAs (type or variable). In the normal case, the size of the pointer is determined by the architecture of the platform your compiler is running on. Help us identify new roles for community members, Proposing a Community-Specific Closure Reason for non-English content. Factors on Which the Size of Pointer in C Depends The size of a pointer in C depends on the factors like Processor word size and CPU Architecture. This cookie is set by GDPR Cookie Consent plugin. The size of a pointer in C/C++ is not fixed. Why are there 8 bits in a byte? A pointer is just an address of memory where the start of the variable is located. So, the size of a pointer to a pointer should have the usual values, that is, 2 bytes for a 16-bit machine, 4 bytes for a 32-bit machine, and 8 bytes for a 64-bit machine. What is the rationale behind copy elision in C++? The cookie is used to store the user consent for the cookies in the category "Other. Better way to check if an element only exists in one array. However, to my surprise the result is 2 and sizeof(a) = 8. I wanted to play around with this and wrote the following function: I tried inputting an array with three elements, let's say. is it sizeof (int ) or size of (long int)? @APM500 there's nothing special about an integer pointer, char pointer, float pointer or say, ifstream pointer. So a pointer (variable which points to a memory location) should be able to point to any of the memory address ( 2^32 for 32 bit and 2^64 for 64 bit ) that a machines holds. To learn more, see our tips on writing great answers. A pointer is a variable that holds an address. a is (meant to be) an array (but because it's a function argument, has been adjusted to a pointer to the 1st element), and as such, has the size of a pointer. @WeatherVane: I think they understand that (they're clearly aware it would decay to a pointer). Why do I get this error? Find centralized, trusted content and collaborate around the technologies you use most. Solution 2. I don't think the '8' is the size of address itself. Using Parentheses in Partial Template Specialization, CMake error - Target foo INTERFACE_SOURCES property contains path which is prefixed in the source directory. We use cookies on our website to give you the most relevant experience by remembering your preferences and repeat visits. Passing a pointer to a member function as a template argument. What is the size of a pointer of type class? type, the operand is evaluated; otherwise, the operand is not evaluated and the result is an the number of bytes per word) depends on the platform. You also have the option to opt-out of these cookies. 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why size of pointer is 8 bytes 2022