Perl的标量逗号运算符何时有用？

发布时间：2020-12-15 21:46:22 所属栏目：大数据来源：网络整理

导读：有没有理由在for循环之外的任何地方使用标量逗号运算符？解决方法由于Perl标量逗号是C逗号运算符的“端口”,因此 these comments可能是适用的： Once in a while,you find yourself in a situation in which C expects a single expression,but you have t

有没有理由在for循环之外的任何地方使用标量逗号运算符？

解决方法

由于Perl标量逗号是C逗号运算符的“端口”,因此 these comments可能是适用的：

Once in a while,you find yourself in
a situation in which C expects a
single expression,but you have two
things you want to say. The most
common (and in fact the only common)
example is in a for loop,specifically
the first and third controlling
expressions. What if (for example) you
want to have a loop in which i counts
up from 0 to 10 at the same time that
j is counting down from 10 to 0?

因此,我认为,你对for循环主要有用的本能是一个很好的直觉.

（编辑：李大同）

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