Program in C to demonstrate factorial function

Write a program in C to demonstrate factorial function

#include "stdio.h"

#include "conio.h"

long int factorial(int n);

void main()

{

            int n,i;

            float s,r;

            char c;

            clrscr();

            repeat : printf("You have this series:- 1/1! + 2/2! + 3/3! + 4/4!");

            printf("To which term you want its sum? ");

            scanf("%d",&n);

            s=0;

            for (i=1;i<=n;i++)

            {

                        s=s+((float)i/(float)factorial(i));

            }

            printf("The sum of %d terms is %f",n,s);

            fflush(stdin);

            printf ("Do you want to continue?(y/n):- ");

            scanf("%c",&c);

            if (c=='y')

                        goto repeat;

            getch();

}

long int factorial(int n)

{

            if (n<=1)

                        return(1);

            else

                        n=n*factorial(n-1);

            return(n);

}