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fix typo in ex11.md #27

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你已经初步了解C语言如何处理循环，但是你可能不是很清楚布尔表达式`i < argc`是什么。在学习`while`循环之前，让我先来对布尔表达式做一些解释。

在C语言中，实际上没有真正的“布尔”类型，而是用一个整数来代替，0代表`false`，其它值代表`true`。上一个练习中表达式`i < argc`实际上值为1或者0，并不像Python是显式的`Ture`或者`False`。这是C语言更接近计算机工作方式的另一个例子，因为计算机只把值当成数字。
在C语言中，实际上没有真正的“布尔”类型，而是用一个整数来代替，0代表`false`，其它值代表`true`。上一个练习中表达式`i < argc`实际上值为1或者0，并不像Python是显式的`True`或者`False`。这是C语言更接近计算机工作方式的另一个例子，因为计算机只把值当成数字。

现在用`while`循环来实现和上一个练习相同的函数。这会让你使用两种循环，来观察两种循环是什么关系。

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