为V [我++]未定义用C？ [英] Is v[i++] undefined in C?

问题描述

我想code，它通过字符检查一个函数*一个[] ，而且往往最终会使用类似

I'm trying to code a function that checks a through a char* a[], and often end up using something like

if(a[i] == 'x'){
    i++;
    //...
}

现在我真的想改变这 A [我++] 代替，但它似乎并没有工作。

Now I would really like to change this to a[i++] instead, but it doesn't seem to work.

问：

难道我在这里做得不对，或者是有一个清洁的替代，以避免我++ ？

Am I doing something wrong here, or is there a clean alternative to avoid the i++?

请注意：目前我在功能13排3是我++ ，这使得它看起来显著大于它确实是。

Note: Currently 3 of my 13 rows in the function are i++, which makes it look significantly larger than it really is.

推荐答案

如果（A [++] =='X'）本身是C.它细然而，语义不同：您原来的code仅增加 I 如果条件为真，而如果（A [++] == 'X'）总是增加 I 。

if (a[i++] == 'x') by itself is fine in C. It is, however, semantically different: Your original code only increments i if the condition is true, whereas if (a[i++] == 'x') always increments i.

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