基本数据类型及转换

代码

// example.go
package test

import "fmt"

func BasicDataTypes() {
	fmt.Println("整数类型")
	var (
		n1        = 0b0101 //二进制,默认为int
		n2 int8   = 0o77   //八进制
		n3 uint16 = 0xAF   //十六进制
	)
	//%T代表打印该变量的类型
	fmt.Printf("n1=%v,type is %T\n", n1, n1)
	fmt.Printf("n2=%v,type is %T\n", n2, n2)
	fmt.Printf("n3=%v,type is %T\n", n3, n3)

	fmt.Println("浮点类型")
	var (
		f1         = 1.0 //默认为float64
		f2 float32 = 1
		f3 float64 = 2
	)
	fmt.Printf("f1=%v,type is %T\n", f1, f1)
	fmt.Printf("f2=%v,type is %T\n", f2, f2)
	fmt.Printf("f3=%v,type is %T\n", f3, f3)

	fmt.Println("类型转换")
	n2 = int8(n3) //将n3强制转换成int8类型
	fmt.Printf("n2=%v\n", n2)

	fmt.Println("字符型")
	var (
		c1 byte //默认为0，是uint8的别名
		c2      = '0'
		c3 rune = '中' //rune类型，是int32的别名
	)
	fmt.Printf("c1的码值=%v,码值对应的字符%c,type is %T\n", c1, c1, c1)
	fmt.Printf("c2的码值=%v,码值对应的字符%c,type is %T\n", c2, c2, c2)
	fmt.Printf("c3的码值=%v,码值对应的字符%c,type is %T\n", c3, c3, c3)

	fmt.Println("布尔型")
	var bool1 bool = true
	fmt.Printf("bool1=%v,type is %T\n", bool1, bool1)

	fmt.Println("字符串")
	var s1 string = "hello"
	fmt.Println(s1 + " world")
	fmt.Println(s1, "world")   //跟上一个等价，可以将逗号替换成空格
	fmt.Println(len("XIXIXI")) //可以求字符串的长度
}

// main.go
package main

import (
	"GoExample/test"
)

func main() {
	test.BasicDataTypes()
}