extern multidimensional arrays question

[svar]

A question on the right way to use extern with multidim arrays
#define dim1 10
#define dim2 10
int a[dim1][dim2];
main(){
int foo();
extern int a[][];
}

foo(){
extern int a[][];
...
}

compiles fine, but in foo, a[][] is undefined
-unless I am missing something


while if in the main and foo I say
extern int a[dim1][];
I get a compilation error
invalid use of array with unspecified bounds

 

[Salem]

You just can't leave the dimensions empty
[tt]extern int a[dim1][dim2];[/tt]

Though you might be able to leave the FIRST dimension empty, like you can with an array parameter to a function.
[tt]extern int a[][dim2];[/tt]


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