循环
与其他主要编程语言的差异
Go 语⾔言仅⽀支持循环关键字 for
for ( j := 7; j <= 9; j++ )
/***
* @Description: Go语言仅支持循环关键字for
* @Param:
* @return:
* @Author:
* @Date: 2022/8/11
*/
func TestWhileLoop(t *testing.T) {
n := 0
//while(n<5)
for n < 5 {
t.Log(n)
n++
}
}
// 无限循环
func TestWhileEndLessLoop(t *testing.T) {
n := 0
for {
t.Log(n)
n++
}
}
if条件
if condition {
// code to be executed if condition is true
} else {
// code to be executed if condition is false
}
if condition-1 {
// code to be executed if condition-1 is true
} else if condition-2 {
// code to be executed if condition-2 is true
} else {
// code to be executed if both condition1 and condition2 are false
}
func TestIfMultiSec(t *testing.T) {
if a := 1 == 1; a {
t.Log("1==1")
}
}
与其他主要编程语⾔言的差异
- condition 表达式结果必须为布尔值
- 支持变量量赋值:
if var declaration; condition {
// code to be executed if condition is true
}
switch 条件
switch os := runtime.GOOS; os {
case "darwin":
fmt.Println("OS X.”)
//break
case "linux":
fmt.Println("Linux.")
default:
// freebsd, openbsd,
// plan9, windows...
fmt.Printf("%s.", os)
}
switch {
case 0 <= Num && Num <= 3:
fmt.Printf("0-3")
case 4 <= Num && Num <= 6:
fmt.Printf("4-6")
case 7 <= Num && Num <= 9:
fmt.Printf("7-9")
}
package condition
import "testing"
func TestIfMultiSec(t *testing.T) {
if a := 1 == 1; a {
t.Log("1==1")
}
}
// if 支持多返回值判断 Boolean,可回调函数多返回值判断
func TestIfMultiSec1(t *testing.T) {
if a := 1 == 1; a {
t.Log("1==1")
}
}
// switch
func TestSwitchMultiCase(t *testing.T) {
for i := 0; i < 5; i++ {
switch i {
case 0, 2:
t.Log("2,0 Tom")
case 1, 3:
t.Log("1,3, LiSi")
default:
t.Log("it is not 0-3")
}
}
}
// switch condition 类似if else写法
func TestSwitchCaseCondition(t *testing.T) {
for i := 0; i < 5; i++ {
switch {
case i%2 == 0:
t.Log(" Tom")
case i%2 == 1:
t.Log(" LiSi")
default:
t.Log("it is unknown")
}
}
}
与其他主要编程语⾔言的差异
- 条件表达式不限制为常量量或者整数;
- 单个 case 中,可以出现多个结果选项, 使⽤用逗号分隔;
- 与 C 语⾔言等规则相反, Go 语⾔言不不需要⽤用break来明确退出⼀一个 case;
- 可以不设定 switch 之后的条件表达式,在此种情况下,整个 switch 结
构与多个 if…else… 的逻辑作⽤用等同
PS:学习笔记,侵删!