go的变量定义

package main   //理解包的概念

import "fmt"

var (
   aa = 1
   bb = "kkk"
   ss = true
)

func variableZeroValue() {
   var a int
   var s string
   fmt.Printf("%d %q\n",a,s)
}

func variableInitialValue() {
   var a,b int = 3, 4
   var s string = "abc"
   fmt.Println(a,b,s)
}

func variableTypeDeduction() {
   var a,b,c,s = 3,4,true,"def"
   fmt.Println(a,b,c,s)
}

func variableShorted() {
   a,b,c,s := 4,5,6,7
   //:=只能在函数中使用，包外不能使用
   b = 8
   fmt.Println(a,b,c,s)
}

func main() {
   fmt.Println("Hello world")
   variableZeroValue()
   variableInitialValue()
   variableTypeDeduction()
   variableShorted()
}