package main

import "fmt"

func main() {

var a int = 10

var b = 20

/// 这种新式声明对象的时候 C 必须为未声明的对象

c := 30

/// 打印

fmt.Println("a =",a,"b =",b,"c =",c)

const num = 100

const num1,num2 = 10,20

fmt.Println(num,num1,num2)

/// iota 表示从0开始，自动加一 声明常量

const(

Kevin = iota + 10

Kevin1

Kevin2

)

fmt.Println(Kevin,Kevin1,Kevin2)

var nums = max(10,20)

/// 打印

fmt.Println(nums)

return_name("kevin")

var array = []int{10,20,30}

/// &取地址

fmt.Println(array,&array[1])

/// 动态数组(切片)

fmt.Println("切片 = ",array[:2])

fmt.Println("切片 = ",array[:])

rangeFunc()

mapFunc()

}

/* 函数返回两个数的最大值 */

func max(num1, num2 int) int {

/* 定义局部变量 */

var result int

if (num1 > num2) {

result = num1

} else {

result = num2

}

return result

}

/// 函数传参

func return_name(kevin string) {

fmt.Println("welcome",kevin)

}

/// Range的使用

func rangeFunc() {

nums := []int{0,22,33,55,66,88}

// for index,num := range nums {

打印索引值和Value

// fmt.Println(index,"=",num)

// }

for num := range nums {

// 打印索引

fmt.Println(num)

}

}

/// map 集合

func mapFunc() {

// var dict map[string]string

dict := make(map[string]string)

dict["kevin"] = "张广义"

dict["Alice"] = "冯殊荣"

dict["Tom"] = "猫"

dict["Jerry"] = "老鼠"

for name := range dict {

fmt.Println(name,"=",dict[name])

}

flagK,flagV := dict["kevin"]

if (flagV) {

fmt.Println(flagK,flagV)

}else {

fmt.Println("No Jack")

}

}　　

 

 

package main

import "fmt"

/// 定义接口

type Kevins interface {

calls()

}

/// 定义结构体

type Toms struct {

}

/// 实现接口方法

func (toms Toms) calls(){

fmt.Println("实现接口方法")

}

func main() {

var name Kevins

name = new(Toms)

name.calls()

}