golang判断素数，水仙花数和求阶乘

1) 判断素数

// main.go
package main

import (
    "fmt"
    "math"
)

func isPrime(a int) bool {
    if a == 1 {
        return false
    }
    for i := 2; i <= int(math.Sqrt(float64(a))); i++ {
        if a%i == 0 {
            return false
        }
    }
    return true
}

func main() {
    var n int
    var m int
    fmt.Scanf("%d %d", &n, &m)
    for i := n; i < m; i++ {
        if isPrime(i) == true {
            fmt.Printf("%d ---> 是素数\n", i)
        }
    }
}


// main.py
#!/usr/bin/env python
# _*_ coding:utf-8 _*_


def isPrime(a):
    if a == 1:
        return False
    for i in range(2, a):
        if a % i == 0:
            return False

    return True


def main():
    for i in range(1, 10):
        if isPrime(i) == True:
            print("%s ---> 是素数" % i)


if __name__ == '__main__':
    main()

2) 判断水仙花数

// main.go
package main

import (
    "fmt"
    "strconv"
)

func isSxh(a int) int {
    var sum int
    s := strconv.Itoa(a)  // 把数字转换为字符
    // fmt.Println(s)
    // fmt.Println(len(s))
    for i := 0; i < len(s); i++ {
        j := fmt.Sprintf("%c", s[i])  // s[i]是相应字符对应的ascii码  ，使用fmt.Sprintf("%c", s[i])转换ascii码对应的真正的字符
        // fmt.Println(j)
        k, _ := strconv.Atoi(j)  // 把字符转换为数字
        sum += k * k * k
    }
    // fmt.Println(strings.Repeat("#", 30))
    return sum
}

func main() {
    for i := 1; i < 2000; i++ {
        // result := isSxh(i)
        // fmt.Println(result)
        if isSxh(i) == i {
            fmt.Printf("%d ---> 是水仙花数\n", i)
        }
    }
}


// main.py
#!/usr/bin/env python
# _*_ coding:utf-8 _*_


def isSxh(a):
    s = "%s" % a
    sum = 0
    for i in range(len(s)):
        sum += int(s[i]) ** 3
    return sum


def main():
    for i in range(10, 2000):
        if isSxh(i) == i:
            print("%s ---> 是水仙花数" % i)


if __name__ == '__main__':
    main()

3) 求阶乘

// mian.go
package main

import "fmt"

func jiecheng(a int) {
    var sum = 1
    for i := 1; i <= a; i++ {
        sum = sum * i
    }
    fmt.Printf("%d 的阶乘是 %d\n", a, sum)
}

func main() {
    for i := 1; i < 10; i++ {
        jiecheng(i)
    }
}


// main.py
#!/usr/bin/env python
# _*_ coding:utf-8 _*_


def jiecheng(a):
    if a <= 0:
        print("不允许小于等于0")
        return
    sum = 1
    for i in range(1, a + 1):
        sum = sum * i
    print("%s 的阶乘是 %s" % (a, sum))


def main():
    for i in range(1, 10):
        jiecheng(i)


if __name__ == '__main__':
    main()