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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 takes two parameters: int *ptr2 = realloc (ptr1, size); The first parameter is a pointer to the memory that is being resized. The second parameter specifies the new size of allocated memory, measured in bytes.
27 lip 2020 · The realloc () function is used to resize allocated memory without losing old data. It's syntax is: Syntax: void *realloc(void *ptr, size_t newsize); The realloc() function accepts two arguments, the first argument ptr is a pointer to the first byte of memory that was previously allocated using malloc() or calloc() function.
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.
21 maj 2023 · A previous call to free or realloc that deallocates a region of memory synchronizes-with a call to any allocation function, including realloc that allocates the same or a part of the same region of memory.
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.
