Go语言流程控制详情

if x > 10 {
    fmt.Println("x is greater than 10")
} else {
    fmt.Println("x is less than 10")
}

// 计算获取值 x,然后根据 x 返回的大小，判断是否大于 10。
if x := computedValue(); x > 10 {
    fmt.Println("x is greater than 10")
} else {
    fmt.Println("x is less than 10")
}

//这个地方如果这样调用就编译出错了，因为 x 是条件里面的变量
fmt.Println(x)

if count == 3 {
    fmt.Println("The count is equal to 3")
} else if count < 3 {
    fmt.Println("The count is less than 3")
} else {
    fmt.Println("The count is greater than 3")
}

func myFunc() {
i := 0
Here: //这行的第一个词，以冒号结束作为标签
println(i)
i++
goto Here //跳转到 Here 去 }

for expression1; expression2; expression3 {
    //...
}

package main
import "fmt"
func main(){
    sum := 0;
    for index:=0; index < 10 ; index++ {
    sum += index
}
    fmt.Println("sum is equal to ", sum)
}
// 输出：sum is equal to 45

sum := 1
for ; sum < 1000; {
    sum += sum
}

sum := 1
for sum < 1000 {
    sum += sum
}

for index := 10; index > 0; index-- {
if index == 5{
    break // 或者 continue
}
    fmt.Println(index)
}
// break 打印出来 10、9、8、7、6
// continue 打印出来 10、9、8、7、6、4、3、2、1

for k,v:=range map {
    fmt.Println("map's key:",k)
    fmt.Println("map's val:",v)
}

for _, v := range map{
    fmt.Println("map's val:", v)
}

switch sExpr {
    case expr1:
        some instructions
    case expr2:
        some other instructions
    case expr3:
        some other instructions
    default:
        other code
}

i := 10
switch i {
case 1:
    fmt.Println("i is equal to 1")
case 2, 3, 4:
    fmt.Println("i is equal to 2, 3 or 4")
case 10:
    fmt.Println("i is equal to 10")
default:
    fmt.Println("All I know is that i is an integer")
}

integer := 6
switch integer {
case 4:
    fmt.Println("The integer was <= 4")
case 5:
    fmt.Println("The integer was <= 5")
case 6:
    fmt.Println("The integer was <= 6")
case 7:
    fmt.Println("The integer was <= 7")
case 8:
    fmt.Println("The integer was <= 8")
default:
    fmt.Println("default case")
}

The integer was <= 6
The integer was <= 7
The integer was <= 8
default case