[Oberon] open array usage

[Bob Walkden]

You have to declare a variable whose type is an array, and populate the elements individually. This is for Blackbox:

TYPE 
	Denis = ARRAY 3 OF REAL;

VAR
	d: Denis;

PROCEDURE Sum(reals:ARRAY OF REAL) : REAL ;
VAR i : INTEGER;
	x: REAL;
BEGIN
	x := 0.0;
	FOR i := 0 TO LEN( reals )-1 DO
		x := x + reals[i];
	END;
	RETURN x;
END Sum;

PROCEDURE T2*;
BEGIN
	d[0] := 1.1;
	d[1] := 2.2;
	d[2] := 4.4;
	Out.Real( Sum( d ),7 );
END T2;

Pascal's WRITE is a method of writing text to the screen. Oberon has a more interesting and general solution, but you can use procedures in the Out module to write text to the log. 

Bob

> -----Original Message-----
> From: oberon-bounces at lists.inf.ethz.ch [mailto:oberon-
> bounces at lists.inf.ethz.ch] On Behalf Of spir
> Sent: 10 July 2010 16:40
> To: Oberon
> Subject: [Oberon] open array usage
> 
> Hello,
> 
> 
> Sorry for coming back to the topic, but I still cannot figure out how
> open arrays are supposed to be used in Oberon, without any form of
> literal notation.
> 
> PROCEDURE Sum(reals:ARRAY OF REAL) : REAL ;
> PROCEDURE Max(reals:ARRAY OF REAL) : REAL ;
> How can one pass [1,2,3] or [a,b,c] to one of those procedures?
> 
> TYPE STRING = POINTER TO ARRAY OF CHAR ;
> PROCEDURE concat(ARRAY OF STRING) : STRING ;
> PROCEDURE write(ARRAY OF STRING) ;
> 
> How can one concat or write ["Hello, ", name, ", how do you do?"]?
> 
> Is there an answer?
> If not, how to achieve that, or anyhow work around the issue?
> 
> Side-question: how to define an Oberon equivalent to Pascal's write?
> 
> 
> Denis
> 
> ________________________________
> 
> vit esse estrany ☣
> 
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