1.go语言布尔类型

go语言中的布尔类型有两个常量值：true和false，0值默认是false。布尔类型经常用在条件判断语句，或者循环语句。也可以在逻辑表达式中。

1.1布尔类型

package main

import "fmt"

func main(){
	var b1 bool = true
	var b2 bool = false
	var b3 = true
	var b4 = false
	
	b5 := true
	b6 := false
	
	fmt.Printf("b1: %v\n",b1)
    fmt.Printf("b2: %v\n",b2)
    fmt.Printf("b3: %v\n",b3)
    fmt.Printf("b4: %v\n",b4)
    fmt.Printf("b5: %v\n",b5)
    fmt.Printf("b6: %v\n",b6)
}

package main

import "fmt"

func main(){
	var b1 bool = true
	var b2 bool = false
	var b3 = true
	var b4 = false
	
	b5 := true
	b6 := false
	
	fmt.Printf("b1: %v\n",b1)
    fmt.Printf("b2: %v\n",b2)
    fmt.Printf("b3: %v\n",b3)
    fmt.Printf("b4: %v\n",b4)
    fmt.Printf("b5: %v\n",b5)
    fmt.Printf("b6: %v\n",b6)
}

条件判断

package main

import "fmt"

func main() {
	age := 18
	ok := age >= 18
	fmt.Printf("ok: %v\n",ok)
	if ok {
		fmt.Printf("成年")
	} else {
		fmt.Printf("no成年")
	}

}

package main

import "fmt"

func main() {
	age := 18
	ok := age >= 18
	fmt.Printf("ok: %v\n",ok)
	if ok {
		fmt.Printf("成年")
	} else {
		fmt.Printf("no成年")
	}

}

for循环语句

packe main

import "fmt"

func main() {
	count := 10
	for i := 0; i < count; i++ {
		fmt.Printf("i= %v\n",i)
	}
}

packe main

import "fmt"

func main() {
	count := 10
	for i := 0; i < count; i++ {
		fmt.Printf("i= %v\n",i)
	}
}

逻辑表达式

package main

import "fmt"

func main() {
	age := 18
	gender := "男"
	
	if age >= 18 && gender == "男" {
		fmt.Printf("成年")
	}
}

package main

import "fmt"

func main() {
	age := 18
	gender := "男"
	
	if age >= 18 && gender == "男" {
		fmt.Printf("成年")
	}
}

注意：不能使用0或者非0表示真假

package main

func main() {
	i := 1
	if i {
		//编译错误
	}
}

package main

func main() {
	i := 1
	if i {
		//编译错误
	}
}