How to Dynamically Allocate Memory using calloc() in C?

What is calloc()?

calloc() (contiguous allocation) allocates memory for an array of elements and initializes all bytes to zero.

Syntax

void* calloc(size_t numElements, size_t elementSize);

Example

int *arr = (int*) calloc(5, sizeof(int));
if (arr == NULL) {
    printf("Memory allocation failed");
}
// all 5 elements are initialized to 0
free(arr);

calloc() vs malloc()

• calloc() initializes memory to zero; malloc() leaves it uninitialized.
• calloc() takes two arguments (count and size); malloc() takes only total size.