C Program To Find The Sum Of The Series s=2+4+6+.....+n By Indirect Method Using For Loop

    /*Write a c program to find the sum of the Series s=2+4+6+.....+n
             by indirect method using for loop  */
#include <stdio.h>
#include <stdlib.h>

int main()
{
    int n,i,sum=0;
    printf("Enter the even value for n :\n");
        scanf("%d",&n);
    if(n%2==0)
     {
        for(i=2;i<=n;i+=2)
            sum=sum+i;

         printf("Sum of the series is = %d\n",sum);
     }
    else
        printf("Invalid input!\n");

    return 0;
}

Out Put:

Enter the even value for n :
6
Sum of the series is = 12