The if statement supports an optional else clause that indicates a block of program statements that should be processed if the Boolean expression evaluates False.

if语句支持一个可选的else子句，指示当布尔表达式计算为False时应该处理的程序语句块。

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The solution provided is remarkably simple: you add an extra if statement to the else clause.

提供的解决方案非常简单：给else子句添加一个额外的if语句。

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The while loop, as was the case with the if statement, supports an optional else clause containing a block of program statements executed when the expression is False.

while循环与if语句一样，支持一个可选的else子句，其中包含一个当表达式计算为False时执行的程序语句块。

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