Golang 学习笔记

$ go env -w GO111MODULE=on
$ go env -w GOPROXY=https://goproxy.cn,direct

/*
块
注释
*/
// 行注释

import（
  "fmt"
  "math"
)

func bmi(weight, height float64) (bmi float64, is_normal bool) {
	bmi = weight / (math.Pow(height, 2))
	if (18.5 < bmi) && (bmi < 23.9) {
		is_normal = true
	}
	return
}

bool
string
int  int8  int16  int32  int64
uint uint8 uint16 uint32 uint64 uintptr
byte // uint8 的别名
rune // int32 的别名
    // 代表一个Unicode码
float32 float64
complex64 complex128

package main

import (
	"fmt"
	"math/cmplx"
)

var (
	ToBe   bool       = false
	MaxInt uint64     = 1<<64 - 1
	z      complex128 = cmplx.Sqrt(-5 + 12i)
)

func main() {
	const f = "%T(%v)\n"
	fmt.Printf(f, ToBe, ToBe)
	fmt.Printf(f, MaxInt, MaxInt)
	fmt.Printf(f, z, z)
}