C++ programming-Factorial of given number

#include<iostream.h>

#include<conio.h>

void main()

{

clrscr();

int n;

long int fact(int n);

cout<<"enter a number\n";

cin>>n;

cout<<"factorial="<<fact(n)<<endl;

getch();

}

long int fact(int n)

{

if(n==0)

return 1;

else

 return(n*fact(n-1));

 }

output

enter a number

6

factorial=720