go | 05 返回值

package main
import "fmt"
//单个返回值
func foo1(a int, b string) int  {
    fmt.Println("a=",a)
    fmt.Println("b=",b)
    c := 100
    return c
}
//多个返回值,都是匿名
func foo2(a int, b string) (int,int){
    fmt.Println("a=",a)
    fmt.Println("b=",b)
    return 100,200
}
//多个返回值，有形参名
func foo3(a int, b string) (r1 int,r2 int){
    fmt.Println("a=",a)
    fmt.Println("b=",b)
    fmt.Println("赋值前：r1=",r1,",r2=",r2)
    //给有名称的返回值变量赋值
    r1 = 300
    r2 = 400
    return
}
//多个返回值，同种类型缩写
func foo4(a int, b string) (r1,r2 int){
    fmt.Println("a=",a)
    fmt.Println("b=",b)
    fmt.Println("赋值前：r1=",r1,",r2=",r2)
    //给有名称的返回值变量赋值
    r1 = 300
    r2 = 400
    return
}
func main()  {
    fmt.Println("foo1 ---------------------------")
    c := foo1(1,"bb")
    fmt.Println("c=",c)
    fmt.Println("foo2 ---------------------------")
    d,e := foo2(1,"bb")
    fmt.Println("d=",d)
    fmt.Println("e=",e)
    fmt.Println("foo3 ---------------------------")
    r1,r2 := foo3(1,"bb")
    fmt.Println("r1=",r1)
    fmt.Println("r2=",r2)
}