Addition of number using an array

 // add n number using an array

#include<stdio.h>

int main()

{

    int array[100],a,b,n,sum;

    printf("enter the value through which you want to add:");

    scanf("%d",&n);

    printf("enter %d integers:",n);

    for(a=0;a<=n;a++)

    {

        scanf("%d",&array[a]);

        sum= sum+ array[a];

    }

    printf("%d",sum);

    }