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28 maj 2017 · Size of dynamically allocated memory can be changed by using realloc (). As per the C99 standard: void *realloc(void *ptr, size_t size); realloc deallocates the old object pointed to by ptr and returns a pointer to a new object that has the size specified by size.
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From man realloc:The realloc() function returns a pointer to the newly allocated memory, which is suitably aligned for any kind of variable and may be different from ptr, or NULL if the request fails.
The realloc() function tries to resize the memory at ptr1 and return the same memory address. If it cannot resize the memory at the current address then it will allocate memory at a different address and return the new address instead.
8 sie 2024 · The purpose of realloc in C is to expand current memory blocks while leaving the original content as it is. realloc() function helps to reduce the size of previously allocated memory by malloc or calloc functions. realloc stands for reallocation of memory.
21 maj 2023 · Reallocates the given area of memory. If ptr is not NULL, it must be previously allocated by malloc, calloc or realloc and not yet freed with a call to free or realloc. Otherwise, the results are undefined. The reallocation is done by either:
6 lut 2023 · realloc returns a void pointer to the reallocated (and possibly moved) memory block. If there isn't enough available memory to expand the block to the given size, the original block is left unchanged, and NULL is returned.
In this tutorial, you'll learn to dynamically allocate memory in your C program using standard library functions: malloc (), calloc (), free () and realloc () with the help of examples.
