(Sn) arithmatic progression

By: adarshsojitra on 16:30

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#include<stdio.h>
#include<conio.h>
main()
{
        long a,d,n,Sn;
        clrscr();
        printf("Enter Starting point (a): ");
        scanf("%ld",&a);
        printf("\nEnter difference(d): ");
        scanf("%ld",&d);
        printf("\nEnter the number of term (n): ");
        scanf("%ld",&n);
        Sn=n*((2*a)+(n*d)+(-d))/2;
        printf("\nSum till %ld term is %ld",n,Sn);
        getch();
}