kotlin 尾递归阶乘

Factorial of number is the product of all positive numbers less or equal to the number.

数字阶乘是所有小于或等于该数字的正数的乘积。

Factorial of number n is denoted by n! is calculated using the formula, n! = n*(n-1)*(n-2)*...*2*1.

n的阶乘由n！ 使用公式n计算！ = n *(n-1)*(n-2)* ... * 2 * 1 。

To find the factorial of the entered number, we have used a for loop that runs from n to 1. At each iteration, i is multiplied with the factorial variable.

为了找到输入数字的阶乘 ，我们使用了一个从n到1的for循环。 在每次迭代中， i乘以阶乘变量。

Example:

例：

    Input: 
    n = 5

    Output:
    factorial = 120 [5x4x3x2x1 = 120]

在Kotlin查找数字阶乘的程序 (Program to find factorial of a number in Kotlin)

package com.includehelp.basic

import java.util.*

// Main Method Entry Point of Program
fun main(args:Array<String>) {
    // InputStream to get Input
    var reader = Scanner(System.`in`)
    
    // Input Integer Value
    println("Enter Number : ")
    var number = reader.nextInt()
    
    var factorial: Long=1
    
    for(i in 1..number){
        // Calculate Factorial
        factorial*=i.toLong()
    }
    
    // printing
    println("Factorial of $number is $factorial ")
}

Output

输出量

Run1 :
Enter Number :
5
Factorial of 5 is 120
---
Run 2:
Enter Number :
12
Factorial of 12 is 479001600

翻译自: https://www.includehelp.com/kotlin/find-factorial-of-a-number.aspx

kotlin 尾递归阶乘