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Problem: Error:Invalid array bound specification.

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Problem: **Error**:Invalid array bound specification.

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giannisAPI

Rookie

Joined: Sun Mar 02, 2008 9:41 am
Posts: 25

Problem: **Error**:Invalid array bound specification.

Hi,

I am trying to define the following array in a function:

void environment(){
int y = TargetY * 2;
int x = TargetX * 2;
int array[y][x];
}

And i keep getting the following errors:
**Severe*:Constant Expression Expected
**Error**:Invalid array bound specification.
**Error**:Expected->';'. Found ', '
**Error**:Unexpected scanner token-> ', '
**Error**:Unexpected scanner token-> '['
*Warning*:Meaningless statement -- no code generated

Would anyone know why please?

Regards,
Giannis

Sun Mar 09, 2008 2:16 pm

Ford Prefect

Senior Roboticist

Joined: Sat Mar 01, 2008 12:52 pm
Posts: 936
Location: a small planet in the vicinity of Beteigeuze

you may use only constant dimensions in declaration of arrays:


	Code: void environment(){ int y; int x; // are both variables, no constants! // int array[y][x]; // ERROR, because x, y are variables! // declare: const int yMax=40; // 40 or 30 or 50 or sth. else const int xMax=40; // xMax and yMax are constants! int array[yMax][xMax]; // works fine! y = TargetY * 2; // where has Targetx/y been declared? x = TargetX * 2; // and now use only array[0...y][0...x] }

sort of dynamic memory allocation on the heap like the following ANSI C construct does not work in RobotC (as far as I know):


	Code: int array; int x; int y; y=TargetY2; x=TargetX2; // TargetX/Y have to be defined earlier array= (int ) malloc(yxsizeof(int)) ;

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Ford Prefect

Never purchase release 1.x ! (ancient programmer's wisdom)
"Don't argue with idiots. They'll drag you down to their level and then beat you with experience."

Mon Mar 10, 2008 12:54 pm

giannisAPI

Rookie

Joined: Sun Mar 02, 2008 9:41 am
Posts: 25

Hi,

Thanks for the reply.

I did try malloc but it does not work, i can confirm that.

Thanks for your reply.

Regards,
Giannis

Mon Mar 10, 2008 5:12 pm

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