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Using arrays in MACROS [C language]

#define VAR_X {1,2,3,4}

I am trying to declare arrays in macros like the one above. I am a little confused about whether it is a correct approach because no compilation error occurs. Let me know the correct approach to declare and use it.

Solution

  • I believe you are asking if you can use the following:

    #define VAR_X {1,2,3,4}

int x[] = VAR_X;

    If so, yes. The preprocessor replaces the VAR_X token with a sequence of tokens consisting of {, 1, ,, 2, ,, 3, ,, 4 and }, and this produces valid C code.

    Even the following is valid (although illegible):

    #define X ] = {
#define Y 1,
#define Z 3,4};

int x[ X Y 2, Z