这两个变体之间有什么区别？

Question

I tried to make my own code for learning how to return multiple values in main function:

package main

import "fmt"

func main() {
    fmt.Println("Enter a integer:")
    var I int
    fmt.Scanf("%d", &I)
    fmt.Println("Accepted:", I)

    O := half(I)
    fmt.Println("Returned:", O)
}

func half(N int) (int, bool) {
    var NA int
    NA = N / 2
    if NA%2 == 0 {
        fmt.Println("even")
        return NA, true
    } else {
        fmt.Println("odd")
        return NA, false
    }
}

And given error: half.go|11| multiple-value half() in single-value context. However another variant are working:

package main

import (
    "fmt"
)

func half(number int) (int, bool) {
    if x := int(number % 2); x == 0 {
        return x, true
    } else {
        return x, false
    }
}

func main() {
    fmt.Println(half(1))
    fmt.Println(half(2))
}

What am I doing wrong? How to overcome my error?

Answer 1

fmt.Println accepts any number of arguments, so is ok accepting the results of half.

In the first one, you need to provide places for both variables. Either:

i,b := half(2)

or

i, _ := half(2)

if you don't need the second return.