＆QUOT;左值要求作为分配及QUOT的左操作数;错误 [英] "lvalue required as left operand of assignment " error

问题描述

以下code生产

if( c >= 'A' && c <= 'Z'  || c = " " || c = ",") {

我以为我在写这个毛病，有什么不好？我怎么会写这是否正确？
我想AP preciate任何帮助！ :)

I assume I'm writing this wrong, what is wrong? and how would I write it correctly? I would appreciate any help! :)

感谢。

推荐答案

您应该使用单引号字符和平等做双等号（否则它改变c的值）

You should use single quotes for chars and do double equals for equality (otherwise it changes the value of c)

if( c >= 'A' && c <= 'Z'  || c == ' ' || c == ',') {

此外，你可能会考虑这样的事情，让您的布尔逻辑更加清晰：

Furthermore, you might consider something like this to make your boolean logic more clear:

if( (c >= 'A' && c <= 'Z')  || c == ' ' || c == ',') {

虽然你的布尔逻辑结构的工作原理等同（安培;＆功放;在需要precedence ||），这样的事情可能会发觉你在未来

Although your boolean logic structure works equivalently (&& takes precedence over ||), things like this might trip you up in the future.

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