what is the difference between calloc and malloc in c code example

Example 1: difference between malloc and calloc and realloc

if (!(int *ptr = malloc(sizeof(int) * NUM_ELEM))){    // ERROR CONDITION HERE}

Example 2: what is the use of malloc in c

In C, the library function malloc is used to allocate a block of memory on the heap. The program accesses this block of memory via a pointer that malloc returns. When the memory is no longer needed, the pointer is passed to free which deallocates the memory so that it can be used for other purposes.

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C Example