在一行中的多个作业 [英] Multiple assignment in one line

问题描述

我刚刚碰到的声明在嵌入式C（dsPIC33系列）

I just come across the statement in embedded c (dsPIC33)

sample1 = sample2 = 0;

请问这意味着

sample1 = 0;

sample2 = 0;

为什么他们键入这样说？这究竟是好还是坏的编码？

Why do they type it this way? Is this good or bad coding?

推荐答案

请记住，分配做从右到左，他们是正常的前pressions。因此，从编译器的角度行

Remember that assignment is done right to left, and that they are normal expressions. So from the compilers perspective the line

sample1 = sample2 = 0;

是相同的

sample1 = (sample2 = 0);

这是相同的

sample2 = 0;
sample1 = sample2;

这就是 SAMPLE2 分配为零，则 SAMPLE1 分配的价值SAMPLE2 。在实践中一样，你猜到分配都为零。

That is, sample2 is assigned zero, then sample1 is assigned the value of sample2. In practice the same as assigning both to zero as you guessed.

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