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Variables (Java and Corel Paradox Cross Reference Guide)

By Mike Prestwood

Java versus Corel Paradox: A side by side comparison between Java and Corel Paradox.

Language Basics

Language basics is kind of a catch all for absolute beginner stuff. The items (common names) I chose for language basics is a bit random and include items like case sensitivity, commenting, declaring variables, etc.


[Other Languages] 

Languages Focus

A variable holds a value that you can use and change throughout your code so long as the variable is within scope. With variable declaration, you not only want to know the syntax of how you declare a variable but you also want to know where. Are you allowed to declare a variable inline? What are the available scopes: local vs. global. Can you assign a value at the same time you declare a variable?

Java:   int x = 0;

Variable names are case sensitive.

The Java basic types are boolean, byte, short, int, long, float, double, and char. You can also declare a variable to hold a particular instance of a class such as String.

Syntax Example:

C++, Java, and C# all use C-like variable declaration.

int a;
int a, b;
int age = 43;
String FullName;
Corel Paradox:   var x SmallInt endVar

Declaring variables is optional unless you click Program | Compiler Warnings while in the ObjectPAL editor for every form, script, and library you create. Using Compiler Warnings is strongly recommended to avoid incorrectly typing an existing variable and to avoid any confusion about variable scope. Also recommended is turning on Compile with Debug for every form, script, and library too for tighter, cleaner code.

Undeclared variables are AnyType variables. Common data types include Currency, Date, Datetime, Logical, LongInt, Number, SmallInt, String, and Time.

Syntax Example:
    FullName String
    Age SmallInt
    Weight Number
FullName = "Mike Prestwood"
Age = 32
Weight =154.4
msgInfo("", FullName + ", age=" + String(Age) 
             + ", weight=" + String(Weight))

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