Repeat While 循环

2025 年 3 月 17 日 | 阅读 1 分钟

Repeat While 循环和 While 循环一样，但是 Repeat...While 循环体在检查测试表达式之前会执行一次。

语法

repeat {
    // statements
    ...
} while (testExpression)

在这个循环中，repeat while 循环体首先执行一次，然后检查 testExpression。

Repeat While 循环的流程图

示例

var currentLevel:Int = 0, finalLevel:Int = 5
let gameCompleted = true
repeat {
    //play game
    if gameCompleted {
        print("You have successfully completed level \(currentLevel)")
        currentLevel += 1
    }
} while (currentLevel <= finalLevel)
print("Terminated! outside of repeat while loop")

输出

You have successfully completed level 0
You have successfully completed level 1
You have successfully completed level 2
You have successfully completed level 3
You have successfully completed level 4
You have successfully completed level 5
Terminated! outside of repeat while loop

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