Go 程序查找数字的各位数字之积

使用 for 循环编写一个 Go 程序来查找数字的各位数字之积。for 循环条件保持数字大于零。在循环中， 

• prodReminder = prodNum % 10 -> 返回数字的最后一位数字。
• product = product * prodReminder -> 将最后一位数字与 product 相乘。
• prodNum = prodNum / 10 – 它会从 prodNum 中移除最后一位数字。

package main

import "fmt"

func main() {

    var prodNum, product, prodReminder int

    fmt.Print("Enter the Number to find the Digits Product = ")
    fmt.Scanln(&prodNum)

    for product = 1; prodNum > 0; prodNum = prodNum / 10 {
        prodReminder = prodNum % 10
        product = product * prodReminder
    }
    fmt.Println("The Product of Digits in this Number = ", product)
}

Go 程序使用函数查找数字的各位数字之积

package main

import "fmt"

var product int

func digitsProduct(prodNum int) int {
    var prodReminder int

    for product = 1; prodNum > 0; prodNum = prodNum / 10 {
        prodReminder = prodNum % 10
        product = product * prodReminder
    }
    return product
}
func main() {

    var prodNum int

    fmt.Print("Enter the Number to find the Digits Product = ")
    fmt.Scanln(&prodNum)

    product = digitsProduct(prodNum)
    fmt.Println("The Product of Digits in this Number = ", product)
}

SureshMac:GoExamples suresh$ go run digitsProd2.go
Enter the Number to find the Digits Product = 879
The Product of Digits in this Number =  504
SureshMac:GoExamples suresh$ go run digitsProd2.go
Enter the Number to find the Digits Product = 45
The Product of Digits in this Number =  20

此 Golang 程序通过递归调用 digitsProduct(prodNum / 10) 函数来计算数字的各位数字之积。

package main

import "fmt"

var product int = 1

func digitsProduct(prodNum int) int {
    if prodNum <= 0 {
        return 0
    }

    product = product * (prodNum % 10)
    digitsProduct(prodNum / 10)
    return product
}
func main() {
    var prodNum int

    fmt.Print("Enter the Number to find the Digits Product = ")
    fmt.Scanln(&prodNum)

    product = digitsProduct(prodNum)
    fmt.Println("The Product of Digits in this Number = ", product)
}

SureshMac:GoExamples suresh$ go run digitsProd3.go
Enter the Number to find the Digits Product = 4789
The Product of Digits in this Number =  2016
SureshMac:GoExamples suresh$ go run digitsProd3.go
Enter the Number to find the Digits Product = 22457
The Product of Digits in this Number =  560