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Factorial series-e^x

Factorial series-e^x

#include <stdio.h>
#include <conio.h>
#include<math.h>
long int factorial(int n);
void main()
{
 int x,i;
 float s,r;
 char c;
 clrscr();
printf("You have this series:-1+x/1! + x^2/2! + x^3/3! + x^4/4!
..x^x/x!");
 printf("
To which term you want its sum?  ");
 scanf("%d",&x);
 s=0;
 for (i=1;i<=x;i++)
  {   s=s+((float)pow(x,i)/(float)factorial(i)); }
 printf("The sum of %d terms is %f",x,1+s);
 fflush(stdin);
      getch();
}

long int factorial(int n)
 {
  if (n<=1)
	return(1);
  else
	n=n*factorial(n-1);
	return(n);
 }