package main

import (
	"flag"
	"fmt"
)

var (
	name     = flag.String("name", "Tom", "Please input your name:") // 默认值 Tom
	age      = flag.Int("age", 6, "Please input your age:")          // 默认值 6
	hasMoney = flag.Bool("hasMoney", true, "Do you have any money?") // 默认值 true
)

func main() {
	flag.PrintDefaults() // 打印参数提示信息
	flag.Parse()

	fmt.Printf("name is %s\n", *name)
	fmt.Printf("name is %d\n", *age)
	fmt.Printf("name is %t\n", *hasMoney)
}

// 默认参数
// $ go run main.go
// 输出如下 
/**
    -age int
          Please input your age: (default 6)
    -hasMoney
          Do you have any money? (default true)
    -name string
          Please input your name: (default "Tom")
  name is Tom
  name is 6
  name is true
*/

// 设置参数
// $ go run main.go -name=Jerry -age=8 -hasMoney=false
// 输出如下 
/**
    -age int
          Please input your age: (default 6)
    -hasMoney
          Do you have any money? (default true)
    -name string
          Please input your name: (default "Tom")
  name is Jerry
  name is 8
  name is false
*/