变量声明

package main

import "fmt"

// The var statement declares a list of variables; as in function argument lists, the type is last.
var i, j int = 1, 2
var k int = 3

// If an initializer is present, the type can be omitted; the variable will take the type of the initializer.
// var name,age = "Matt", 20
// var gender = 1
// 等同如下方式
var (
    name = "Matt"
    age = 20
    gender int
)

// Outside a function, every statement begins with a keyword (var, func, and so on) and so the := construct is not available.
// a := "hello" //在函数外，不能这样定义

// 变量的零值
var height int
var married bool
var city string

func main() {
    var c, python, java = true, false, "no!"

    // 简短声明。Inside a function, the := short assignment statement can be used in place of a var declaration with implicit type.
    a := "hello"

    fmt.Println(a, i, j, k,c, python, java)
    fmt.Println(name ,age, gender)
    fmt.Println(height,married,city)
}