| pl/sql program constructs [message #39696] |
Fri, 02 August 2002 07:55  |
jimlo
Messages: 1
Registered: August 2002
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Junior Member |
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You are to discuss in detail these six different program constructs. You should at least cover the following but should not be limited only to these points:
• Explain what are these six different program constructs.
• Compare and contrast each of them.
• Explain when are they being used.
• Discuss the application areas of each and illustrate with samples of codes.
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| Re: pl/sql program constructs [message #39706 is a reply to message #39696] |
Fri, 02 August 2002 11:19  |
Jon
Messages: 483
Registered: May 2001
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Senior Member |
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Iteration
Branching
Decisions
Comparisons
Sequence
Henway
They are alike in that they are all program constructs, i.e. used by programmers to, um, program stuff, especially software. They are different in that they don't do the same things; otherwise, they would just be one construct and not six.
They are being used when they are in programs, specifically programs that are running, sometimes called run-time programs. Otherwise, they are not being used and then they are pretty much useless.
Loops are useful for repeating logic. For example,
for i in 1..1000 loop
writeOnChalkboard('I will do my own homework and not try to get people on the internet to do it for me');
end loop;
Branching takes the logic of the program to a different place;
goto HelenaHandBasket;
Decision constructs refer to IF-THEN-ELSE
IF IDontKnow THEN
goto Internet;
ELSE
goto AnswerTheQuestionMyself;
END IF;
Comparisons evaluate expressions to return a TRUE or FALSE result:
IF UR > SmarterThanABrick THEN
AlbeeAMonkeysUncle;
Sequence is the order of execution of the statments
DoM;
DoI;
DoC;
DoK;
DoE;
DoY;
& finally...Henway.
What's a Henway?
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about two pounds.
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