C program for using malloc,calloc,realloc and free function.

#include <stdio.h> 

#include <stdlib.h>

 int main() 

{

    int* p; 

    int n, i;

    n=5; 

    printf("Enter number of elements: %d\n", n);

    p=(int*)calloc(n, sizeof(int));

    if (p==NULL) 

    { 

      printf("\n Memory not allocated"); 

      exit(0); 

    } 

   else 

   { 

    printf("\n ***Memory successfully allocated using calloc***"); 

    for(i=1;i<=n;++i) 

    { 

      p[i]=i+i; 

   } 

    printf("\n •••The elements of the array are•••"); 

    for(i=1;i<=n;++i) 

    { 

    printf("\n \t %d",p[i]); 

    } 

    n=10; 

    printf("\n Enter the new size of the array: %d\n", n); 

    p= realloc(p,n * sizeof(int));

    printf("\n ***Memory successfully re-allocated using realloc***"); 

    for(i=6;i<=n;++i) 

    { 

       p[i]=i+i; 

    }

    printf("\n •••The elements of the array are•••"); 

    for(i=6;i<=n;++i) 

    { 

    printf("\n \t %d",p[i]); 

    } 

    free(p); 

  } 

   return 0;

}

***Input && Output***