扩展字符串文字内部的宏 [英] Expand macro inside string literal

问题描述

我要执行的操作是#define宏:

#define a(2)

，然后在字符串文字:string = "a";中使用它.

and later use it inside a string literal: string = "a";.

我希望将该字符串解释为不是字符串，而是获取a的值，即2.我没有成功，有人可以帮忙吗?

I want that string to be interpreted not as string but to get the value of a, i.e. 2. I didn't succeed, can anybody help?

推荐答案

#define STRINGIFY2(X) #X
#define STRINGIFY(X) STRINGIFY2(X)
#define A 2

然后STRINGIFY(A)将给您"2".您可以将它们并排放置，以将其与其他字符串文字串联起来.

Then STRINGIFY(A) will give you "2". You can concatenate it with other string literals by putting them side by side.

"I have the number " STRINGIFY(A) "."给您"I have the number 2.".

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