# 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++

`// 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

`// 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

`# 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#

`// 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

`<?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

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