From COBOL to OOP
Written for the experienced COBOL programmer, this nuts and bolts guide offers a comprehensive introduction to OOP techniques, and provides a migration of 10 million lines of COBOL code to object-oriented programming.
TABLE OF CONTENTS From COBOL to OOP
3.5: Language Particularities
3.5 Language Particularities
Focus on the programming language of your choice
This section focuses on the programming languages of interest in our study. In particular, it describes special functionalities, such as procedure variables, overloaded methods, or nontypified parameters. All these functionalities are normally specific to a language: each language has its own particularities. Accordingly, we have divided this tutorial into two parts. The first discusses the particularities of Delphi, and the second those of Java. Readers who are interested only in one of these languages can skip the other.
3.5.1 Delphi Particularities
Open-Array Parameter
In Delphi, fixed sizes are assigned to arrays during the declaration. This is not necessarily an advantage, as we can easily see in the following example. For instance, if we have a given array[1..30] of Integer, a procedure for the output of this array would look as follows:
procedure Print (a: array[1..30] of Integer); var i: Integer;begin for i := 1 to 30 do WriteLn(a[i]);end;
Array without limits
This procedure has a fixed parameter list. For example, if a second array[1..32] of Integer were given and also had to be output, the procedures would have to be written a second time certainly a useless additional cost. The solution is an open-array parameter, which means that the array is declared without limits. When limits of the array are required within the procedure, they will always reach from 0 to High. Accordingly, the procedure could look as follows:
procedure...
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