C program to calculate factorial of number N using function.

#include<stdio.h>

#include<conio.h>

void main(){

int n;

long int ans;

long int factorial(int x);

printf("Enter an integer number\n");

scanf("%d",&n);

if(n>0) {

ans=factorial(n);

printf("factorial of %d=%ld\n",n,ans);

}

else printf("wrong input\n");

getch();

}

long int factorial(int x){

int i; long int fact=1;

for (i=1;i<=x;i++) fact=fact*i;

return (fact);

}