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Editorial Team
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Asked: 2026-06-18T00:58:03+00:00

I have something like: #define BASE_FOLDER = Resources #define PREFERENCE_FILE_NAME = AppPreferences.txt #define SPLASH_FILE_NAME

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I have something like:

#define BASE_FOLDER = "Resources"
#define PREFERENCE_FILE_NAME = "AppPreferences.txt"
#define SPLASH_FILE_NAME = "Splash.png"

#define PREFERENCE_PATH = ".\\" + BASE_FOLDER + "\\" + PREFERENCE_FILE_NAME
#define SPLASH_PATH = ".\\" + BASE_FOLDER + "\\" + SPLASH_FILE_NAME

and the compiler is throwing errors where PREFERENCE_PATH is used.

expecting primary expression before = token.

These all worked when I was doing

#define PREFERENCE_PATH = ".\\Resources\\AppPreferences.txt"
#define SPLASH_PATH = ".\\Resources\\Splash.png"

What am I doing wrong?

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1 Answer

  1. Editorial Team

    Get rid of the equal signs. Preprocessor definitions don’t use equal signs.

    Then get rid of the pluses. String literals are concatenated when you put them side by side without a plus in between. Emphasis on literals because this is a compile-time feature that only works with double-quoted literals, as in "foo" "bar" → "foobar". It doesn’t work with variables.

    #define BASE_FOLDER          "Resources"
#define PREFERENCE_FILE_NAME "AppPreferences.txt"
#define SPLASH_FILE_NAME     "Splash.png"

#define PREFERENCE_PATH ".\\" BASE_FOLDER "\\" PREFERENCE_FILE_NAME
#define SPLASH_PATH     ".\\" BASE_FOLDER "\\" SPLASH_FILE_NAME
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