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Java Forum / General / October 2007"WHILE" Loops
"Use WHILE. Write an application that calculates the product of the odd integers from 1 to 15 and then displays the result." How would I do this? > "Use WHILE. Write an application that calculates the product of the > odd integers from 1 to 15 and then displays the result." > > How would I do this? doing your homework ;-) int i=3; int e=1; while(i<=15) { if( i%2 == 0 ) e*=i; i++; } System.out.println(e); | > "Use WHILE. Write an application that calculates the product of the | > odd integers from 1 to 15 and then displays the result." [quoted text clipped - 10 lines] | } | System.out.println(e); What an interesting, subtle answer. Because the OP doesn't understand the problem, he'll never find the bug in it. > | > "Use WHILE. Write an application that calculates the product of the > | > odd integers from 1 to 15 and then displays the result." [quoted text clipped - 13 lines] > What an interesting, subtle answer. Because the OP doesn't understand the > problem, he'll never find the bug in it. But even with that lack of understanding, if they run the example they will quickly find out that it gives the wrong answer. They just won't know why.  SignatureLew | > | > "Use WHILE. Write an application that calculates the product of the | > | > odd integers from 1 to 15 and then displays the result." [quoted text clipped - 16 lines] | But even with that lack of understanding, if they run the example they will | quickly find out that it gives the wrong answer. They just won't know why. Having taught Computer Science at a university, it's my experience that the student will simply take the output as correct without crosschecking it. > | > | > "Use WHILE. Write an application that calculates the product of > the [quoted text clipped - 24 lines] > the > student will simply take the output as correct without crosschecking it. Then they will get a grade corresponding to the effort they put into it. Matt Humphrey wrote: >> Having taught Computer Science at a university, it's my experience that >> the >> student will simply take the output as correct without crosschecking it. > Then they will get a grade corresponding to the effort they put into it. How idealistic. SignatureLew > Matt Humphrey wrote: >>> Having taught Computer Science at a university, it's my experience that [quoted text clipped - 4 lines] > > How idealistic. Heh. Point taken, however the profs I had actually checked our work for correctness, and graded accordingly. It has been 30 years; perhaps that is a passé concept. > > Matt Humphrey wrote: > >>> Having taught Computer Science at a university, it's my experience that > >>> the > >>> student will simply take the output as correct without crosschecking it. My experience is similar. Alas. > >> Then they will get a grade corresponding to the effort they put into it. > > [quoted text clipped - 3 lines] > correctness, and graded accordingly. It has been 30 years; perhaps that is a > passé concept. Putting in my two cents' worth as someone who teaches undergrad CS courses, many of them involving programming: I can't speak for all instructors, but some of us still try to check students' work for correctness, and -- well, I suppose it depends on what you mean by "grade accordingly", but certainly I deduct points if I discover [*] that a program submitted for a grade doesn't do what it's supposed to. [*] Usual caveats about testing apply. I try to also at least look at their code, but sheer volume often means I can't look very carefully. SignatureB. L. Massingill ObDisclaimer: I don't speak for my employers; they return the favor. >"Use WHILE. Write an application that calculates the product of the >odd integers from 1 to 15 and then displays the result." > >How would I do this? see http://mindprod.com/jgloss/homework.html http://mindprod.com/jgloss/jcheat.html SignatureRoedy Green Canadian Mind Products The Java Glossary http://mindprod.com >"Use WHILE. Write an application that calculates the product of the >odd integers from 1 to 15 and then displays the result." > >How would I do this? Do you know what a while loop is? Can you write one? Were you present when you instructor taught about while loops? If not then you will need to read you Java book about while loops or ask your instructor. Do you know what "product" means in this context? If not then ask your instructor for clarification. Do you know what an "odd integer" is? If not then consult a maths text or ask your instructor. Do you nkow how to display the reesult? If not then consult your Java book or ask your instructor. At this point you should understand the question. You can make your first attempt at writing the answer. Test your attempt and fix any errors. If you find you cannot fix a problem than post your code here and we can help you. You need to post code for two reasons: first to show that you are willing to do the work yourself and second to let us get a handle on how much you know so we can tailor our advice to your level of skill. The product of all the odd integers from 1 to 15 is 2027025, which you will need to know when you are checking your solution. rossum > The product of all the odd integers from 1 to 15 is 2027025, which you > will need to know when you are checking your solution. Come on, give them credit for being able to use a calculator, at least. >> "Use WHILE. Write an application that calculates the product of the >> odd integers from 1 to 15 and then displays the result." BTW, there is no such thing as "WHILE" in Java. The assignment must have meant something else than what people have been answering, perhaps some custom idiom or module the professor provides? SignatureLew oh wow. i wasn't expecting this kind of response. all you guys are so great, you helped me so much. i have a question though, what does "if( i%2 != 0)" mean? > oh wow. i wasn't expecting this kind of response. all you guys are so > great, you helped me so much. i have a question though, what does > "if( i%2 != 0)" mean? It means there's a mistake in the answer. Look up the word "modulus" and it'll make sense. (If it doesn't, consider dropping the course.) >> oh wow. i wasn't expecting this kind of response. all you guys are so >> great, you helped me so much. i have a question though, what does >> "if( i%2 != 0)" mean? >> > It means there's a mistake in the answer. Look up the word "modulus" and > it'll make sense. (If it doesn't, consider dropping the course.) Actually, if you reread the thread closely, I think you may find that "ericcc" is having a bit of fun with you. SignatureJohn W. Kennedy "Sweet, was Christ crucified to create this chat?" -- Charles Williams. "Judgement at Chelmsford" > "Use WHILE. Write an application that calculates the product of the > odd integers from 1 to 15 and then displays the result." > How would I do this? while (0) {} // use while loop long result= 2027025 + 0; // the +0 is, so it is "calculated" System.out.println(result);// display the result >> "Use WHILE. Write an application that calculates the product of the >> odd integers from 1 to 15 and then displays the result." [quoted text clipped - 3 lines] > long result= 2027025 + 0; // the +0 is, so it is "calculated" > System.out.println(result);// display the result while(0) doesn't work in Java. You need something that evaluates to a boolean value. SignatureDaniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/> >>> "Use WHILE. Write an application that calculates the product of the >>> odd integers from 1 to 15 and then displays the result." [quoted text clipped - 6 lines] >while(0) doesn't work in Java. You need something that evaluates to a >boolean value. Shhh. When answering homework questions you must include at least one deliberate error so that the questioner has to actually read the code rather than just copy it. Andreas was right. rossum >>>> "Use WHILE. Write an application that calculates the product of the >>>> odd integers from 1 to 15 and then displays the result." [quoted text clipped - 8 lines] > deliberate error so that the questioner has to actually read the code > rather than just copy it. Andreas was right. I didn't tell them how to fix the error, now did I? :-) SignatureDaniel Pitts' Tech Blog: <http://virtualinfinity.net/wordpress/> >> "Use WHILE. Write an application that calculates the product of the > long result= 2027025 + 0; // the +0 is, so it is "calculated" That is "calculated" by the compiler, not by an application. piotr >>> "Use WHILE. Write an application that calculates the product of the >> long result= 2027025 + 0; // the +0 is, so it is "calculated" > That is "calculated" by the compiler, not by an application. hairsplitter :-) Free MagazinesGet these publications absolutely FREE for up to 12 months. There are no hidden fees and no obligation. Simply choose a title, complete the application form and submit it. Read more ...
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