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Asked: 2026-06-11T19:28:01+00:00

I don’t know how to define a macro string with variable, like this: #define

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I don’t know how to define a macro string with variable, like this:
#define str(x) "file x.txt", that mean I desire that str(1) refers to “file 1.txt”.
However, in the case, str(1) or any number refers to “file x.txt”, because x is an character.
Is there any way to solve this?

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1 Answer

  1. Editorial Team

    Concatenate the strings:

    #define STR(x) "file " #x ".txt"

    This makes use of a lexical feature of the two languages: adjacent string literals are concatenated; see both C++11 2.2/6 and C11 5.1.1.2/6:

    Adjacent string literal tokens are concatenated.

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