One line function for factorial of a number

Factorial of a non-negative integer, is multiplication of all integers smaller than or equal to n.

Example :

Factorial of 6 is 6 * 5 * 4 * 3 * 2 * 1 which is 720.

We can find the factorial of a number in one line with the help of Ternary operator or commonly known as Conditional operator in recursion.

C++

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// C++ program to find factorial of given number
#include<iostream>
  
int factorial(int n)
{
    // single line to find factorial
    return (n==1 || n==0) ? 1: n * factorial(n - 1); 
}
  
// Driver Code
int main()
{
    int num = 5;
    printf ("Factorial of %d is %d", num, factorial(num));
    return 0;
}

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Java

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// Java program to find factorial of given number
  
import java.io.*;
  
class GFG {
  
    static int factorial(int n)
    {
          
        // single line to find factorial
        return (n == 1 || n == 0) ? 1 : n * 
                                factorial(n - 1);
    }
  
    public static void main(String[] args)
    {
          
        int num = 5;
          
        System.out.println("Factorial of " + num + 
                           " is " + factorial(num));
    }
}
  
// This code is contributed by Ajit.

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Python3

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# Python3 program to find
# factorial of given number
  
def factorial(n):
      
    # single line to
    # find factorial
    return 1 if (n == 1 or n == 0) else n * factorial(n - 1);
  
# Driver Code
num = 5;
print("Factorial of", num,
      "is", factorial(num));
  
# This is contributed by mits

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C#

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// C# program to find factorial
// of given number
using System;
  
class GFG 
{
  
    // Function to calculate factorial
    static int factorial(int n)
    {
          
        // single line to find factorial
        return (n == 1 || n == 0) ?
                1 : n * factorial(n - 1);
    }
  
    public static void Main()
    {
          
        int num = 5;
        Console.WriteLine("Factorial of " + num + 
                        " is " + factorial(num));
    }
}
  
// This code is contributed by vt_m.

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PHP

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<?php
// PHP program to find 
// factorial of given number
  
function factorial($n)
{
    // single line to find factorial
    return ($n==1 || $n==0) ? 1 : 
            $n * factorial($n - 1); 
}
  
// Driver Code
$num = 5;
echo "Factorial of ", $num
     " is ", factorial($num);
  
// This code is contributed by Ajit.
?>

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Output :

 Factorial of 5 is 120


My Personal Notes arrow_drop_up

This article is contributed by Rithika palaniswamy. If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

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Improved By : vt_m, jit_t, Mithun Kumar