Calculating factorial of any number in C++

Calculating factorial of any number

#include <iostream>

#include <conio.h>

using namespace std;

int main ()

{

int num;

int factorial=1;

cout<<"enter num";

cin>>num;

for

(int a=1;a<=num;a++)

{

factorial=factorial*a;

}

cout<<"factorial="<<factorial;

getch();

return 0;}

output

enter integer 4

factorial=24