Program to find Factorial of number

#include<iostream.h>
#include<conio.h>
void factorial(int a);
void main()
{
clrscr();
int a;
cout<<"enter a no.";
cin>>a;
factorial(a);
getch();
}
void factorial(int a)
 {
  int fact=1;
  for(int i=1;i<=a;i++)
     {
      fact=fact*i;
     }
cout<<"factorial is"<<fact;
 }