是如果（CONST ==变量）或者（可变==常数）之间的区别？ [英] What is the difference between if(CONST==variable) or if(variable==CONST)?

问题描述

有没有比较运营商的顺序不同？

Is there a difference in the order of the comparison operator?

#define CONST_VALUE 5

int variable;

...

if ( variable == CONST_VALUE )   // Method 1
...

OR

if ( CONST_VALUE == variable )   // Method 2
...

这是简单的preference的问题还是有一个令人信服的理由为特定的比较顺序？

Is this simply a matter of preference or is there a compelling reason for a particular comparison order?

推荐答案

之所以有人使用方法2是因为如果你在的地方==的敲错了=你会得到一个编译器错误。

The reason some people use method 2 is because you'll get a compiler error if you mistype a = in place of the ==.

不过，你得人（像我）谁仍然使用方法1，因为他们觉得更容易阅读，如果有错误，它将测试（或在某些情况下，静态分析过程中被检测code）。

However, you'll have people (like me) who will still use method 1 because they find it more readable and if there is an error, it will be detected during testing (or, in some cases, static analysis of the code).

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