=运算符在三个整数上使用两次时会做什么？ [英] What does the = operator do when used twice on three integers?

问题描述

这是做什么的？

int x = 1;
int y = 2;
int z = 3;
x = y = z;

我在一些开源项目中遇到过多种类型的东西，并且一直很困惑被他们。通过它们我的意思是=运算符在三个整数上使用两次，即 x = y = z; 。我需要了解这一点。谢谢！

I have come across multiple of this type of thing in a few open source projects and have always been confused by them. By them I mean the = operator being used twice on three integers i.e. x = y = z;. I need to understand this. Thanks!

推荐答案

运营商 = 评估右侧并分配结果是左侧的变量。表达式返回此值。

The operator = evaluates the right hand side and assigns the result to the variable on the left hand side. The expression returns this value.

为此，评估从右向左进行：

For this to work, evaluation proceeds from right to left:

x = (y = z);

y 变为3，返回的值是因此， x 也被分配了3个。

y becomes 3 and the value returned is 3. Thus, x is assigned 3 as well.

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