program for eulers theoram

c program for eulers theoram..
#include<conio.h>
#include<stdio.h>
#include<string.h>
void main()
{
float i,f,j,n;
float s=1;
clrscr();
printf("Enter the num\n");
scanf("\n%f",&n);
for(i=1;i<=n;i++)
{
f=1;
 for(j=1;j<=i;j++)
 {
 f=f*j;
 }
 s=s+1/f;
 }
 printf("\n%f\n",s);
 getch();
 }