factorial of a given number

Write a program in C++ which calculates the factorial of a given number using user defined function.

Program Code:

#include <iostream>

using namespace std;

// user defined function named factorial with one argument

int factorial (int a)

{

if (a > 1)

{

return (a * factorial (a-1));

}

else

{

return (1);

}

}

int main()

{

int num;

cout << "Enter a number to find the factorial : ";

cin >>num;

cout<<endl;

cout << "!" << num << " = " << factorial (num);// function call

return 0;

}

The program output is tested on www.jdoodle.com

Output:

Enter a number to find the factorial : 5

!5 = 120

Thanks

Mukesh Rajput