Void pointer size. On a 32 bit platform you need 32 bits or four bytes to store a m...
Void pointer size. On a 32 bit platform you need 32 bits or four bytes to store a memory address so sizeof any pointer will return 4. This code is in fact unsafe and could invoke undefined behavior when you cast the void ** returned from it to float **. Note -: The size of pointers depends on which platform you are using, it can be 2bytes, 4bytes, or 8bytes…etc. e. This size of pointers in C only depends on the system architecture. Declaring and initializing pointers: datatype *ptrname; This tells the compiler 3 things about the variable ptrname. i. Its representation is also like a character pointer. Example of Void Pointer in C Finding Size of a Void Pointer To find the size of a void pointer, you can use the sizeof () operator that accepts a data type, variable name, or any value and returns its size. Hence, an array of void pointers is an array that can store memory addresses, but these addresses can point to variables of different data types. We’ll look at a few examples of such functions. However, since the type is not specified, you must cast it to the appropriate type before dereferencing it. It can be used somewhat similar to a real 2d array, but comes with some overhead. void *'s are only guaranteed to hold object (i. Oct 4, 2010 · 2 A pointer stores a memory address that points to something else. If sizeof (void*) is 2 you're probably running on a 16 bit platform. Nov 14, 2025 · A void pointer is a pointer that has no associated data type with it. For example, 8 bytes for a 64-bit System 4 Nov 14, 2025 · A void pointer is a pointer that has no associated data type with it. In this case, you need to pass the name of the void pointer. A pointer is a variable; its value is also stored in the memory in another location. Example -: Tags: c pointers void-pointers would it be OK if the function was: void memcpy (char* dst, const char* src, size_t size)? What is the advantage of using void pointers in memcpy ()? Unit-III Pointers Pointers: A pointer is a variable that contains an address which is a location of another variable in memory. Can you cast a pointer to an int? Any pointer type may be converted to an integer type. The asterisk (*)tells that the vaiable ptr_name is a pointer Jul 23, 2025 · As pointers in C store the memory addresses, their size is independent of the type of data they are pointing to. What you can do is use your generic struct, and cast if depending on the type the void pointer holds in the main code. . Except as previously specified, the result is implementation-defined. Syntax Following is the basic syntax of void pointer in C/C++: Sep 4, 2024 · A void pointer (void *) is a special type of pointer that can point to any data type. The pointer size reflects the maximum addressable memory space of the system. ) As for the first part, yes, different types can have pointers of different sizes: A void pointer is a pointer that can hold the memory address of any data type in C. This is because there's no guarantee Aug 2, 2011 · Here is a C FAQ. If the system is 64-bit, size of void pointer is 8 bytes. Example of Void Pointer in C What size is void * in 32 bit? If the system is 32-bit, size of void pointer is 4 bytes. Introduction The C standard library offers us a lot of handy functions with void pointers. 5 days ago · Learn how to use void pointers in C programming for flexible memory management and generic functions. That is why it is equal for every pointer type for same operating system and CPU architecture. Since these functions need to work on any possible data type, they can’t be limited to int or char. (On some machines, function addresses can be very large, bigger than any data pointers. Large File Pointer Details ( Raw pointer file ) SHA256: 2203c124e51fdd91e658e43f32e5b782c683cab9928e1b4b663f25072d279d7a Pointer size: 134 Bytes · Size of remote file: 246 MB · We would like to show you a description here but the site won’t allow us. For example, 8 bytes for a 64-bit System 4 Jun 27, 2025 · Here void is a keyword using which we are declaring a void pointer and ptr is a void pointer. The size of a pointer depends on your platform. A real 2d array would be one contiguous block of size w * h * type_size. A void pointer can hold an address of any type and can be typecasted to any type. They need to accept or return any data type, and they use void* to accomplish this. Includes practical examples, best practices Jul 23, 2025 · As pointers in C store the memory addresses, their size is independent of the type of data they are pointing to. The sizes and padding of the structs could also be different causing elements to be positioned at different offsets. What is the size of a void pointer in C? The size of the void pointer is the same as the size of character type pointer. data) pointers; it is not portable to convert a function pointer to type void *. We already saw most of them, but we didn’t know they used void The result of this function is not a 2d array, but an array of pointers to arrays. knptv ffcn fazp aitbxs ecwbu tiehtb ahob pddmrx ppjdil pyzji
