go变量声明和使用

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    package main

    import "fmt"

    var x, y int

    var (
        a int
        b bool
    )

    var c, d int = 1, 2

    var e, f = 123, "hello"

    func main() {

        //这咱不带声明格式的用法，只能出现在函数休内
        g, h := 123, "hello"

        println(x, y, a, b, c, d, e, f, g, h)

        var testString string = "hello world!"

        fmt.Println(testString)

        var a, b int

        a, b = 5, 7

        println("a=", a, "b=", b)

        a, b = b, a

        println("a和b交换后 a=", a, "b=", b)

    }