有没有更好的写法 v = (v == 0 ? 1 : 0); [英] Is there a better way of writing v = (v == 0 ? 1 : 0);

问题描述

我想在 0 和 1 之间切换一个变量.如果它是 0，我想把它设置为 1，否则如果它是 1，我想把它设置为 0.

I want to toggle a variable between 0 and 1. If it's 0 I want to set it to 1, else if it's 1 I want to set it to 0.

这是一个如此基本的操作，我经常写，我想研究一下最短、最清晰的方法.这是我目前最好的:

This is such a fundamental operation that I write so often I'd like to investigate the shortest, clearest possible way of doing it. Here's my best so far:

v = (v == 0 ? 1 : 0);

你能改进吗?

问题是问如何在保持清晰度的同时用最少的字符写出上述语句 - 这怎么能不是一个真正的问题"?这并非旨在成为高尔夫代码练习，尽管人们将其视为高尔夫，但已经得出了一些有趣的答案 - 很高兴看到以建设性和发人深省的方式使用高尔夫.

the question is asking how to write the above statement in the fewest characters while retaining clarity - how is this 'not a real question'? This wasn't intended to be a code-golf exercise, though some interesting answers have come out of people approaching it as golf - it's nice to see golf being used in a constructive and thought-provoking manner.

推荐答案

你可以简单地使用:

v = 1 - v;

这当然假设变量已正确初始化，即它只有值 0 或 1.

This of course assumes that the variable is initialised properly, i.e. that it only has the value 0 or 1.

另一种更短但使用不太常见的运算符的方法:

Another method that is shorter but uses a less common operator:

v ^= 1;

要清楚；我从来没有像代码高尔夫一样处理这个问题，只是为了找到一种简单的方法来完成任务，而不使用任何像操作符的副作用这样的模糊技巧.

To be clear; I never approached this question as code golf, just to find a short way of doing the task without using any obscuring tricks like side effects of operators.

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