(Tn) Arithmetic progression

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#include<stdio.h>
#include<conio.h>
main()
{
        long a,d,n,Tn;
        clrscr();
        printf("Enter Starting point (a): ");
        scanf("%ld",&a);
        printf("\nEnter Difference(d): ");
        scanf("%ld",&d);
        printf("\nEnter the nnumber of term which you want to view: ");
        scanf("%ld",&n);
        Tn=a+((n-1)*d);
        printf("\nThe term is %ld",Tn);
        getch();
}