Declaration and Variable initialization

Variables consist of a name and a type: NameVAR := ….

Example 1:

// String variable

TextVar:= 'Welcome';

Example 2:

// Integer type variable

IntVar:= 16;

Example 3:

// Hexadecimal variable(A16=1010)

HexVar:=$A;

Example 4:

// Char variable (65=A)

CharVar:=#65;

Example 5:

//Boolean variable initialized by an expression

//that checks the file existence

BoolFileExists:=FileExists('c:\customers.db');

The following example shows when the variable is used incorrectly.

MyCustomer:='John Smith';

... some code here ...

// NOTE: The next line of script will cause a error!

MyCustomer:=14;

The variable MyCustomer is initialized using text bounded by a single quote on each side: 'John Doe'. MyCustomer become a string type variable because it's first value is a string.  If you try and replace the current value of MyCustomer with a integer type, the execution of that line of script will generate an error.  However, MyCustomer can be assigned a new value of '14' because '14' is treated as a string type.

// This would OK

MyCustomer:='14';

The error message displayed during the script execution will be: "Runtimeerror: Variable Name expects type ARRAY STRING instead of type ARRAY INTEGER [Position N] ".