Factorial of a Number in C

#include<stdio.h>

#include<conio.h>

void main()

{

int n,i;

long int f=1;

printf("Enter the number");

scanf("%d",&n);

if(n<0)

printf("Factorial Not posible..");

else

{

for(i=1;i<=n;i++)

f=f*i;

    printf("The factorial of %d is %ld",n,f);

    getch();

}

}