1+2+3+4+.............n

 

1+2+3+4+............n

 

//1+2+3+4+.............n

#include<stdio.h>

int main()

{

    int n,sum=0,i;

    printf("enter number= ");

    scanf("%d",&n);

    for(i=1;i<=n;i++)

    {

    sum=sum+i;

    printf("\n%d\n",sum);

    }

}