Golang分配

Question

在Golang中获取平方和

Answer 1

Go没有您可能在其他语言中熟悉的while、until或foreach循环结构。在Go中，for和range语句将它们全部替换：

// Three expressions, i.e. the usual
for i := 0; i < n; i++ {
}

// Single expression; same as while(condition) in other languages
for condition { 
}

// No expressions; endless loop, i.e. same as while(true) or for(;;)
for {
}

// for with range; foreach and similar in other languages. Works with slices, maps, and channels.
for i, x := range []T{} {
}

如果不允许使用Go的单循环结构，则只能使用递归或the goto statement

package main

import (
    "fmt"
)

func main() {
    var N int
    fmt.Scan(&N)

    fmt.Println(f(N, 0))
}

func f(n, sum int) int {
    if n == 0 {
        return sum
    }

    var Y int
    fmt.Scan(&Y)
    if Y > 0 {
        sum += Y * Y
    }

    return f(n-1, sum)
}

使用goto

package main

import (
    "fmt"
)

func main() {
    var N, Y, sum int
    fmt.Scan(&N)

again:
    fmt.Scan(&Y)
    if Y > 0 {
        sum += Y * Y
    }

    N--
    if N > 0 {
        goto again
    }

    fmt.Println(sum)
}