Example of calloc()

The calloc() function allocates memory blocks, we can use it to allocate memory for arrays.

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

int main() {
  //Allocating memory dynamically on the heap
  //for a character array of 50 characters and
  //sets each element to zero.
  char* a = (char*) calloc (50, sizeof(char));
  if (a != NULL)
      printf("Allocated memory for a character array\n");
  else
      printf("calloc() failed");

  //We can use strcpy to copy to this array, since
  //we have allocated memory
  strcpy(a, "Hello from lautturi");

  printf("The character array is:%s\n", a);
  
  //Free the allocated memory
  free(a);

  return 0;
}

output:

Allocated memory for a character array
The character array is:Hello from lautturi
Freed memory from the heap