Sum of even numbers of an array using recursion : C Code

To find the sum of even numbers of an array using recursion.

/* to calculate the sum of even numbers using recursion */

#include<stdio.h>

#include<malloc.h>

int evensumrec(int *a,int n);

int main()

{

int *a,i,n,sum;

printf("\n Enter the number of elements:");

scanf("%d",&n);

a=(int *)malloc(n*sizeof(int));

printf("\n Enter the elements of the array:");

for(i=0;i<n;i++)

      scanf("%d",(a+i));

      sum=evensumrec(a,n-1);

printf("\n Sum of even numbers is %d",sum);

return 0;

}

int evensumrec(int *a, int n)

{

      if(*(a+n)%2==0)

            {

            if(n>=0)

                  return (*(a+n)+evensumrec(a,n-1));

            else

                  return 0;

            }

       else

            return (evensumrec(a,n-1));

}

Input/Output:

 Enter the number of elements:7

 Enter the elements of the array:23

4

-6

13

17

66

0

 Sum of even numbers is 64