一个数的阶乘的一行函数
非负整数的阶乘，是所有小于或等于 n 的整数的乘积
Example :
Factorial of 6 is 6 * 5 * 4 * 3 * 2 * 1 which is 720.
我们可以借助三元算子或者递归中俗称的条件算子来求一行数字的阶乘。
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;
}
Java 语言(一种计算机语言，尤用于创建网站)
// 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.
Python 3
# 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
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.
服务器端编程语言（Professional Hypertext Preprocessor 的缩写）
<?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.
?>
java 描述语言
<script>
// Javascript 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
let num = 5;
document.write("Factorial of ", num,
" is ", factorial(num));
// This code is contributed by _saurabh_jaiswal.
</script>
输出:
Factorial of 5 is 120
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