Go语言学习8-Switch

// Switch
package main

import (
    "fmt"
    "time"
)

func main() {
    //Here’s a basic switch.
    i := 2
    fmt.Print("write ", i, " as ")
    switch i {
    case 1:
        fmt.Println("one")
    case 2:
        fmt.Println("two")
    case 3:
        fmt.Println("three")
    }
    //You can use commas to separate multiple expressions in the same case statement.
    //We use the optional default case in this example as well.
    switch time.Now().Weekday() {
    case time.Saturday, time.Sunday:
        fmt.Println("it's the weekend")
    default:
        fmt.Println("it's a weekday")
    }
    //switch without an expression is an alternate way to express if/else logic.
    //Here we also show how the case expressions can be non-constants.
    t := time.Now()
    switch {
    case t.Hour() < 12:
        fmt.Println("it's before noon")
    default:
        fmt.Println("it's after noon")
    }
}

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