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► KB ► To/From Guides ► Corel Paradox

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Pointers (Corel Paradox and Java Cross Reference Guide)

By Mike Prestwood

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

Data Structures

Data structures allow you to store and work with data. Common data structures include arrays, associative arrays, etc.

Pointers

[Other Languages]

General Info: Pointers / References

A pointer is a variable type that allows you to refer indirectly to another object. Instead of holding data, a pointer holds the address to data -- the address of another variable or object. You can change the address value a pointer points to thus changing the variable or object the pointer is pointing to.

A reference is a type of pointer that cannot change and it must always point to a valid storage (no nulls).

Corel Paradox:

ObjectPAL doesn't have a developer defined pointer type except for use with DLLs where you use a special CPTR uses keyword to refer to a DLL string pointer data type.

Syntax Example: 1 certification question.

Uses Tapi32

  tapiRequestMakeCall(sNumber CPTR, sAppName CPTR,

    sLogName CPTR, sComment CPTR) CLONG

endUses

Java: Not Supported

Java does not offer developer defined pointers.