Factorial series

//Factorial series

#include stdio
#include conio
#include math
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);
}