String expressions (ON CASE)

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Constants

A constant is a value of a special type that you can assign to a variable. The Baan 3GL programming language supports the following types of constants:

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Local variables

Variables declared within a function block are local variables. They are accessible only within the function in which they are declared.

Declaration, initialization, and scope

Point of declaration

In the function between the brackets { }.

Syntax of declaration

<type> name

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Data types

There are five types of variables: long, double, string, table, and domain variables.

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Logical operators

Logical operators perform logical operations on their operands. The operator NOT is unary, so it has only one operand. The operands of logical operators can be logical expressions, relational expressions, variables, or constants.

The following table illustrates the results of logical expressions:

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Declarations

You can declare variables either within a function block or at the start of the program. Variables declared in a function block can be used within that function block only. Variables declared at the start of the program can be used in each function described below the declaration.

General syntax

You declare variables with the following syntax (parts between [ ] are optional):

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Long expressions (ON CASE)

The expression after ON CASE is evaluated and compared with the various CASE expressions that follow. All expressions in the case labels must be of type LONG or STRING. When string expressions are used, the ASCII value of the string is compared with the ON CASE expression. For example:

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Domains

When declaring temporary variables for storing values of database fields, you can use normal variables of type long, double, or string. But this can cause problems if the length or type of the table field has been changed in the data dictionary. It is preferable to use domain declarations for storing the value of a database table field. When you use a domain declaration, the type and length for the declared variable are read from the data dictionary.

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Macro definition (preprocessor)

Use the following statement to define a macro:

#define macroname[(arguments)]

Use the folowing statement to undefine a macro:

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Enumerate and set constants

In the data dictionary you can define database table fields and domains of type enumerate or set.

An enumerate or set domain consists of a number of constants. In the program script (and other places in the data dictionary), a symbolic name is used. The symbolic name is the domain name, followed by a period [.] followed by the name of the constant. Variables of type set can also consist of a combination of set values.

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