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void* realloc(void *ptr, size_t size) 

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void* memcpy(void * dest, const void* source, size_t num) 
// copies the values of num bytes from a source to dest

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void * memset(void * ptr, int val, size_t num) 
// sets the first num bytes in memory to be val

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void * calloc(int num_of_items, int size) 
// allocates num_of_items objects of the specified size
// in the memory and sets the memory to 0 
// essentially equivalent to 

void * ptr = malloc(num_of_items*size);
memset(ptr, 0, num_of_items*size); 

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(void *) malloc(size_t) 
	// allocates size_t consecutive bytes in memory
	// size_t alias for unsigned integer type 

// ======= Usage =======

int * array = (int*) malloc(n * sizeof(int));

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list from C Memory Allocation AND !outgoing(C Memory Allocation)