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Case statements


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Case statements

The If Instead of using a bunch of complex nested if statements, you can use a case statement to provide a more readable alternative so long as the conditionals return an integer.
A simple numerical case statement

A D V E R T I S E M E N T
var
i : Integer;
begin
i := RandomRange(15,20);// Generate a random number from 15 to 20
Case i of
15 : ShowMessage('Random number was fifteen');
16 : ShowMessage('Random number was sixteen');
17 : ShowMessage('Random number was seventeen');
18 : ShowMessage('Random number was eighteen');
19 : ShowMessage('Random number was nineteen');
20 : ShowMessage('Random number was twenty');
end;
end;

Random number was fifteen

The RandomRange routine generates a random number between two given values. However, each time you run the program, it will always start with the same pseudo random value (unless you use RandomSeed)


The case statement above routes the processing to just one of the statements. OK, the code is a bit silly, but it is used to illustrate the point.

// Set x to 1, 2, 3, then 4 to see what // message is displayed. procedure TForm1.Button2Click(Sender: TObject); var lbValue: Byte; // Local byte (lb). begin lbValue := 3; case lbValue of 1: ShowMessage('one'); 2: ShowMessage('two'); 3: ShowMessage('three'); else ShowMessage('special'); end; end;

var
i : Integer;
begin
i := RandomRange(10,20);// Generate a random number from 10 to 20
Case i of
15 : ShowMessage('Random number was fifteen');
16 : ShowMessage('Random number was sixteen');
17 : ShowMessage('Random number was seventeen');
18 : ShowMessage('Random number was eighteen');
19 : ShowMessage('Random number was nineteen');
20 : ShowMessage('Random number was twenty');
else

end;
end;

Unexpected number : 10

Using enumeration case valuesJust as with the If statement, the Case statement may use any ordinal type. This allows us to use the very readable enumeration type:
type
TCar = (Nissan, Ford, Rover, Jaguar);// An enumeration type
var
car : TCar;// An enumeration variable
begin
car := Rover;// Set this variable
case car of
Nissan : ShowMessage('We have a Nissan car');
Ford : ShowMessage('We have a Ford car');
Rover: ShowMessage('We have a Rover car');
Jaguar : ShowMessage('We have a Jaguar car');
end;
end;

We have a Rover car


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Keywords: delphi pointers,delphi programming,delphi files,delphi datatypes,delphi text,delphi graphics,delphi records,delphi text printing

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