Mega Code Archive
Do - defines the start of some controlled action
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1. for Variable := Expression to Expression do Statement;
2. while Expression do Statement
3. try Statements except on ExceptionClass do Statement; end;
4. with Expression do Statement
Description
The Do keyword is always a part of one of the shown 4 control types. It precedes the Sattements section of the control action.
Related commands
Begin Keyword that starts a statement block
End Keyword that terminates statement blocks
Except Starts the error trapping clause of a Try statement
For Starts a loop that executes a finite number of times
Repeat Repeat statements until a ternmination condition is met
Try Starts code that has error trapping
While Repeat statements whilst a continuation condition is met
With A means of simplifying references to structured variables
Example code : Show singles and block do statement blocks
var
i : Integer;
begin
// A for statement - the do keyword precedes a single statement
for i := 1 to 3 Do
ShowMessage('For loop, i = '+IntToStr(i));
// A while statement - the do precedes a statement block
while i < 6 Do
begin
ShowMessage('While loop, i = '+IntToStr(i));
Inc(i);
end;
end;
Show full unit code
For loop, i = 1
For loop, i = 2
For loop, i = 3
While loop, i = 4
While loop, i = 5
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