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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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The realloc() function changes the size of a block of memory and returns a pointer to the block of memory. If there is not enough memory at the current location then the block of memory will be moved to a different location and a different pointer will be returned.
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 C stdlib library realloc() function is used to reallocate the size of dynamically allocated memory. It allows us to allocates or reserves a new memory block after deallocating the previously allocated 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:
The realloc function allocates a block of memory (which be can make it larger or smaller in size than the original) and copies the contents of the old block to the new block of memory, if necessary. Syntax. The syntax for the realloc function in the C Language is: void *realloc(void *ptr, size_t size); Parameters or Arguments ptr The old block ...
6 lut 2023 · Syntax void *realloc( void *memblock, size_t size ); Parameters. memblock Pointer to previously allocated memory block. size New size in bytes. Return value. realloc returns a void pointer to the reallocated (and possibly moved) memory block.
