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void * malloc(size_t size);

void * calloc(size_t nmemb, size_t size);

void * realloc(void *ptr, size_t size);

void free(void *ptr);

 
The specific characteristics of these routines are based on the compiler used. With a few exceptions, this document only considers the general and compiler-independent attributes of these routines.

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Use the sizeof operator correctlyUse variables of type size_t for size parameters to memory allocation routines

References