INT X = 10; X + = x--;在.net中 - 为什么？ [英] int x = 10; x += x--; in .Net - Why?

问题描述

int x = 10;
x += x--;

在C＃/。NET，为什么它等于它等于？ （我故意留下的答案，所以你可以猜测，看看你是对的）的

In C#/.Net, why does it equal what it equals? (I'm purposely leaving the answer out so you can guess and see if you're right)

推荐答案

看看这个语句：

x += x--;

这是等价于：

x = x + x--;

这是等价于：

Which is equivalent to:

int a1 = x; // a1 = 10, x = 10
int a2 = x--; // a2 = 10, x = 9
x = a1 + a2; // x = 20

所以 X 是20后 - 而这保证了规范

So x is 20 afterwards - and that's guaranteed by the spec.

什么的也的pretty的很多保证，但不是由规范，就是使用这种code的人会被他们的同事的攻击。是的，这是很好的结果是predictable。不，这不是很好的使用的那种code。

What's also pretty much guaranteed, although not by the spec, is that anyone using such code will be attacked by their colleagues. Yes, it's good that the result is predictable. No, it's not good to use that kind of code.

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