1.基础定义

变量类型在变量名后

var a int
var s string

2.定义并赋值

var a,b int = 1,2
var s string="abc"

3.类型推导

不用定义变量类型

var a,b,c,s = 1,2,true,"deduction"

4.简写(只能在函数内)

用":="代替"var"

a,b,c,s := 1,2,true,"deduction"

5.定义多个变量并赋值

var(
    a1=1
    s1="package"
    c1=false
)

测试代码

package main
import "fmt"
/*
包内变量，定义多个并赋值
 */
var(
    a1=1
    s1="package"
    c1=false
)
/*
只定义不赋值
 */
func variableZeroValue()  {
    var a int
    var s string
    fmt.Printf("%d %q\n", a,s)
}
/*
定义并赋值
 */
func variableInitialValue()  {
    var a,b int = 1,2
    var s string ="abc"
    fmt.Println(a,b,s)
}
/*
类型推导
 */
func variableTypeDeduction()  {
    var a,b,c,s = 1,2,true,"deduction"
    fmt.Println(a,b,c,s)
}
/*
简写(只能函数内使用)
 */
func variableShorter(){
    a,b,c,s := 1,2,true,"deduction"
    b=1
    fmt.Println(a,b,c,s)
}
func main()  {
    fmt.Println("hello word")
    variableZeroValue()
    variableInitialValue()
    variableTypeDeduction()
    variableShorter()
    fmt.Println(a1,s1,c1)
}