Go中格式化輸出

// code_002_basedata project main.go
package main

import (
"fmt"
)

type Power struct {
ageint
high int
name string
}

func main() {
var str string
str = "abc"
ch := str[0]

fmt.Printf("str= %s, len= %d \n", str, len(str))
fmt.Printf("str[0]= %c, ch = %c\n", str[0], ch)

str2 := `hello
mike \n \r測試
`
fmt.Println("str2=", str2)

var v1 complex64
v1 = 3.2 + 12i
v2 := 3.2 + 12i
v3 := complex(3.2, 12)
fmt.Println(v1, v2, v3)
fmt.Println(real(v1), imag(v1))

fmt.Println("============")

var i Power = Power{18, 178, "tom"}
fmt.Printf("type:%T\n", i)
fmt.Printf("value:%v\n", i)
fmt.Printf("value:%+v\n", i)
fmt.Printf("value:%#v\n", i)
/*
============
type:main.Power
value:{18 178 tom}
value:{age:18 high:178 name:tom}
value:main.Power{age:18, high:178, name:"tom"}
*/

fmt.Println("=====intervface=======")
var interstr interface{} = i
fmt.Printf("%v\n", interstr)
fmt.Println(interstr)

/*
=====intervface=======
{18 178 tom}
{18 178 tom}
*/
}

//常用的格式化字元：%s, %d, %c, %T, %v, %p