Topic: [Solved] Coding condition... the theorical way
Hello Dmitry and all MVD fans,
I turn to you today because I am questioning my logical syntax... 
Let's say I have a series of functions and I want to chain them to achieve a result with conditions like this :
Check a serial number (empty, already in databse or OK)
Get a URL based on this serial (check if begins by http)
Retrive source code of a page (is it empty or OK)
Retrieve a name in the page (is it empty or OK)
All those conditions occur one after another and or dependant on each other, that is why I nest them.
Here is the way I would organize the logical syntax with conditions (of course this is not real code, it's just to show the logicial structure) :
begin
if serial field empty then //BEGIN TEST 1
begin
Cancel := True;
ShowMessage('Error');
end
else if serial allready in databse then //CONTINUES TEST 1
begin
Cancel := True;
ShowMessage('Error');
end
else if serial not empty AND not in database //CONTINUE TEST 1
begin
if URL does not match http then //BEGIN TEST 2
begin
Cancel := True;
ShowMessage('Error');
end
else if URL matches http then //CONTINUE TEST 2
begin
if source empty then //BEGIN TEST 3
begin
Cancel := True;
ShowMessage('Error');
end
else if source not empty then //CONTINUE TEST 3
begin
if name empty then //BEGIN TEST 4
begin
Cancel := True;
ShowMessage('Error');
end
else if name not empty then //CONTINUE TEST 4
begin
Final code;
end; //CLOSE TEST 4
end; //CLOSE TEST 3
end; //CLOSE TEST 2
end; //CLOSE TEST 1
end;I have always been doing it like this, and I feel it is the correct way to do it. But what would happend if I did it the linear way like :
begin
if serial field empty then //BEGIN TEST 1
begin
Cancel := True;
ShowMessage('Error');
end
else if serial allready in databse then //CONTINUES TEST 1
begin
Cancel := True;
ShowMessage('Error');
end
else if serial not empty AND not in database //CLOSE TEST 1
begin
DO SOME CODE
end;
if URL does not match http then //BEGIN TEST 2
begin
Cancel := True;
ShowMessage('Error');
end
else if URL matches http then //CLOSE TEST 2
begin
DO SOME CODE
end;
if source empty then //BEGIN TEST 3
begin
Cancel := True;
ShowMessage('Error');
end
else if source not empty then //CLOSE TEST 3
begin
DO SOME CODE
end;
if name empty then //BEGIN TEST 4
begin
Cancel := True;
ShowMessage('Error');
end
else if name not empty then //CLOSE TEST 4
begin
Final code;
end;
end;But then, if I do it the linear way, will the logic still be respected and the success of CONDITION 1 will trigger CONDITION 2, or will all conditions be tested whatever the result of the previous condition ?
Yes, I know, I sometimes have a disturbed mind
Cheers
Mathias
Each time I get a divorce, I keep the house
Zaza Gabor
