C Language: Pointers 27

Example of calloc() function

Question:
C program to take input for “n” elements and display them allocate the memory dynamically.
Sol:

#include<stdio.h>
#include<stdlib.h>
int  main()
{
  int n,i,*p;
  char ch;
  do
  {
   printf("Enter total elements ");
   scanf("%d",&n);
   p=(int*)calloc(n,sizeof(int));
   if(p==NULL)
   {
     printf("Memory allocation failed\n");
     getch();
     exit(1);//header file : stdlib.h
   }
   for(i=0;i<n;i++)
   {
     printf("Enter the element ");
     scanf("%d",(p+i));
   }
   for(i=0;i<n;i++)
   {
     printf("%d\n",*(p+i));
   }
   free(p);
   printf("Like to cont ... (y/n) ");
   fflush(stdin);
   ch=getchar();//scanf("%c",&ch);
  }while(ch=='y' || ch=='Y');
  return(0);

}

/* Output */
Enter total elements 5
Enter the element 2
Enter the element 2
Enter the element 3
Enter the element 6
Enter the element 4
2
2
3
6
4
Like to cont ... (y/n) y
Enter total elements 2
Enter the element 6
Enter the element 3
6
3
Like to cont ... (y/n) n

Question:
C program to take input for “n” elements and display them also calculate and print sum of all the elements, allocate the memory dynamically.
Sol:

#include<stdio.h>
#include<stdlib.h>
int  main()
{
  int n,i,*p,s;
  char ch;
  do
  {
   printf("Enter total elements ");
   scanf("%d",&n);
   p=(int*)calloc(n,sizeof(int));
   if(p==NULL)
   {
     printf("Memory allocation failed\n");
     getch();
     exit(1);//header file : stdlib.h
   }
   for(i=0;i<n;i++)
   {
     printf("Enter the element ");
     scanf("%d",(p+i));
   }
   s=0;
   for(i=0;i<n;i++)
   {
     printf("%d\n",*(p+i));
     s=s+*(p+i);
   }
   free(p);
   printf("sum = %d\n",s);
   printf("Like to cont ... (y/n) ");
   fflush(stdin);
   ch=getchar();//scanf("%c",&ch);
  }while(ch=='y' || ch=='Y');
  return(0);

}

/* Output */
Enter total elements 5
Enter the element 10
Enter the element 2
Enter the element 3
Enter the element 6
Enter the element 4
10
2
3
6
4
sum = 25
Like to cont ... (y/n) y
Enter total elements 3
Enter the element 2
Enter the element 6
Enter the element 3
2
6
3
sum = 11
Like to cont ... (y/n) n