package main

import "fmt"

var luckyNum = 6
var luckyStr = "love"

//myNum := 6
//在函数外部不可以用  :=

//合并定义
var (
	age  = 18
	name = "jukai"
)

//变量初值
func variableZeroValue() {
	var a int
	var s string
	var isOK bool
	fmt.Print(a, s, isOK)
}

//变量赋值
func variableInitValue() {
	var a, b int = 3, 4
	var s string = "abc"
	fmt.Println(a, b, s)
}

//变量类型推断
func variableTypeDeduction() {
	var a, b, c, s = 3, 4, true, "def"
	fmt.Println(a, b, c, s)
}

//变量简短定义 :=
func variableShorter() {
	// := 定义并赋值
	a, b, c, s := 3, 4, true, "def"
	num := 100
	fmt.Println(a, b, c, s, num)
}

func main() {
	//变量初值
	variableZeroValue()
	//变量赋值
	variableInitValue()
	//变量类型推断
	variableTypeDeduction()
	//变量简短定义 :=
	variableShorter()
	//函数外部定义
	print(age, name)

}