Hi Strictly speaking, it is wrong to show the result as 73.0 as it is not accurate to 1 decimal place.
It would be correct to show the result as 73 if you are not interested in the decimal places. If you are interested in the decimal place then the result should be displayed as 73.6 (not 73.0) or 73.66 if you are interested in 2 decimal places. Also, the rules of rounding should be specified by the client, the exam board in this example may ignore decimal places, but do they always round down, round up or to the nearest ? For this example lets say that the rules say round down, so change the average variable to an int, the result will show as 73 (with no decimal places). On Jan 18, 2:48 pm, [email protected] wrote: > The exercise is not necessarily wrong. > > Displaying someones grade average to decimal places may be wrong, > displaying it as a whole number i.e. 73 may be correct, in that case > the .66 is meaningless. So the exercise may be correct > > On 17 Jan, 21:54, Adrián E. Córdoba <[email protected]> wrote: > > > > > I understood. > > So, that exercise is wrong: the type of variables isn't correctly > > used. > > Thank you, so much. > > > On 17 ene, 04:58, Steffani Trinitra Setyasari <[email protected]> > > wrote: > > > > Maybe I can help you to explain what happened.... > > > The type of variables "mathGrade", "historyGrade" and "scienceGrade" is > > > integer. The divider of "average" is "3" that its type is integer,too. > > > Both the numerator and denominator are integer so the result will be > > > integer too. Although the result of "average " is 73.66.., it will be > > > rounded off to 73. But because the type of "average" is "double" so the > > > result is 73.0 > > > > > > If you want to get the exact result of "average" maybe you can change the > > > divider "3" to "3.0" or change the type of "mathGrade", > > > "historyGrade","scienceGrade" to double. > > > > > > Cheers! > > > > --- On Sat, 17/1/09, Adrián E. Córdoba <[email protected]> wrote: > > > > From: Adrián E. Córdoba <[email protected]> > > > Subject: [java programming] Wrong average in LAB-1034 > > > To: "Free Java Programming Online Training Course By Sang Shin" > > > <[email protected]> > > > Date: Saturday, 17 January, 2009, 2:38 AM > > > > I think something is wrong in LAB-1034, Exercise 1 if/else control > > > structure, "(1.1) Build and run a Java program that uses if/else > > > control structure". > > > If you follow the directives in that LAB, and build an run > > > MyGradesProject and enter the math, history, and science grades (78, > > > 56 and 87 respectively) like the figures show, the program compute and > > > display that the average is "73.0" as Figure-1.15 shows. > > > But, if you compute the same average: > > > > (78+56+87) / 3 > > > > in a calculator (like Windows Calculator), the average is "73.66..". > > > What's wrong? > > > > Thank you in advance. > > > > Importing contacts has never been easier. Bring your friends over > > > to Yahoo! Mail today!http://www.trueswitch.com/yahoo-sg- Hide quoted text > > > - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/javaprogrammingwithpassion?hl=en -~----------~----~----~----~------~----~------~--~---
