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Go if else 语句


else 语句

使用 else 语句指定当条件为 false 时要执行的代码块。

语法

if condition {
  // 如果条件为真,则执行此代码
} else {
  // 如果条件为假,则执行此代码
}

使用 if else 语句

示例

在这个例子中,时间 (20) 大于 18,所以 if 条件为 false。因此,我们继续执行 else 条件,并在屏幕上打印 "晚上好"。如果时间小于 18,程序将打印 "早上好"

package main
import ("fmt")

func main() {
  time := 20
  if (time < 18) {
    fmt.Println("早上好。")
  } else {
    fmt.Println("晚上好。")
  }
}
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示例

在这个例子中,温度是 14,所以 if 的条件为 false,因此执行 else 语句中的代码行

package main
import ("fmt")

func main() {
  temperature := 14
  if (temperature > 15) {
    fmt.Println("外面很暖和")
  } else {
    fmt.Println("外面很冷")
  }
}
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else 语句中的括号应该像 } else { 这样

示例

将 else 括号放在不同的行会引发错误

package main
import ("fmt")

func main() {
  temperature := 14
  if (temperature > 15) {
    fmt.Println("外面很暖和。")
  } // 这会引发错误
  else {
    fmt.Println("外面很冷。")
  }
}

结果

./prog.go:9:3: syntax error: unexpected else, expecting }
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