variable modified ''at file scope

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I have a program where I get the error:

variable modified 'artikel'at file scope
char artikel[ARTNAME];

I think I have to add a #define, but I don't understand exactly which one.

Here is my Code:

#include <stdio.h>
#include <string.h>

const int ARTNAME = 100;

typedef struct artikel {
    char artikel[ARTNAME];
    int anzahl;
} artikel;

int main()
{
}
c
1 Answers

I have a program where I get the error: variable modified 'artikel'at file scope char artikel[ARTNAME];

I don't think you have copied the diagnostic accurately. It is surely complaining about struct artikel being variably modified.

That is closely related to the issue covered in Variably modified array at file scope in C. Specifically, const qualification notwithstanding, ARTNAME is not a "constant expression" in C, so the type of array artikel.artikel and therefore also of the whole struct artikel are "variably modified". Objects with variably modified types cannot be declared at file scope.

I think I have to add a #define, but I don't understand exactly which one.

The quickest solution would probably be to change this ...

    const int ARTNAME = 100;

... to:

#define ARTNAME 100
user_24022720
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