Malloc Free Calloc memory allocation char *malloc unsigned size free char *ptr char *calloc unsignednel unsignedelsize Malloc returns a pointer to a block of at least "size" free bytes. Free requires a pointer to a block that has been allocated by malloc; it frees the space to be allocated again. Calloc allocates space for an array. Nel is the number of elements in the arrary, and elsize is the size of each element. Calloc initializes the space to zero. Malloc, free, and calloc return NULL(0) if no free memory can be found or if there was an error.