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Slackdemic
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Posted on 09-28-06 6:38
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Any serious Java people in here? For some reasons, the following code doesn't work for leap year. Any help/suggestion is appreciated. The classes are Date and TestDate: public void addMonth(int m) { month = month + m; if (month>12) { month-=12; addYear(1); } } public boolean isLeap(int y) { if (y%100==0) { if (y%400==0) return true; else return false; } else if (y%4==0) return true; return false; } public void addDay(int d) { day = day + 1; if (day>28) { if (month==2) { if (isLeap(year)) { if (day>29) { day-=29; addMonth(1); return; } else return; } day-=28; addMonth(1); } else if ((month==4||month==6||month==9||month==11)&&day>30) { day-=30; addMonth(1); } else if (day>31) { day-=31; addMonth(1); } } } public void addYear(int y) { { year += y; if (month==2) if (day==29) if (!isLeap(year)) { setMonth(3); setDay(1); } } } public String toString() { String d=""+day,m=""+month,y=""+year; if (d.length()<2) d="0"+d; if (m.length()<2) m="0"+m; while (y.length()<4) y="0"+y; return m + "/"+ d + "/" + y; //return the value of } //concatenated month, day, and year }
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SAJHACOP
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Posted on 09-28-06 8:44
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public boolean isLeap(int y){ if(y%4==0) return true; else return false; } ************ public void addDay(int d) { day=d+1; if(day > 28) { if((month==2)&&(isLeap(year))){ day-=28; addMonth(1); } else if((month==2)&&(!isLeap(year))){ day-=28; addMonth(1); } ... Leap year is always divisible by 4. I don't know why you are using y%400 and y%100.
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sajhauser
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Posted on 09-28-06 8:47
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Slackdemic, the definition of leap year is wrong in your isLeap(int y) method. 1. Every year divisible by 4 is a leap year. 2. But every year divisible by 100 is NOT a leap year 3. Unless the year is also divisible by 400, then it is still a leap year.
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Slackdemic
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Posted on 09-28-06 8:52
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Yes, I also got that from this website, too. Thanks! www.timeanddate.com/date/leapyear.html
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Prem Charo
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Posted on 09-28-06 8:54
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Don't worry. Help is on the way. I just dialed 991.
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Slackdemic
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Posted on 09-28-06 8:59
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Didn't mean to be rude earlier, guys, but what I did is good: Every year divisible by 4 is a leap year. But every year divisible by 100 is NOT a leap year Unless the year is also divisible by 400, then it is still a leap year. The year that is divisible by 100 is not leap year UNLESS it is divisible by 400! See there? That's exactly what I did. See the if loop: Posted on 09-28-06 6:38 PM Reply | Notify Admin ny serious Java people in here? For some reasons, the following code doesn't work for leap year. Any help/suggestion is appreciated. The classes are Date and TestDate: public void addMonth(int m) { month = month + m; if (month>12) { month-=12; addYear(1); } } public boolean isLeap(int y) { if (y%100==0) { if (y%400==0) return true; -----------> means, if it is divisible by 100 AND 400, return true else return false; ------>if it is divisible ONLY by 100....return false.. } else if (y%4==0) return true; return false; }
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Slackdemic
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Posted on 09-28-06 9:01
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If you are really trying to figure it out, I will say you, have quite a sense of humor. If you are just playing, stop it, I am stressed!
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sajhauser
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Posted on 09-28-06 9:01
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but you haven't included all conditions... everything should be inside one if condition..in nested form starting with yr%4
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Slackdemic
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Posted on 09-28-06 9:01
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And that message is for (somebody's) lovebird.
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Slackdemic
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Posted on 09-28-06 9:06
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Sajhauser: I think there are two conditions for the leap year: One, the year that is divisible by 4 (which is at last). Two, the year that is divisible by 100 AND (then) 400. I don't think they have to be within one pair of braces...or maybe I can make it that way, but I don't think that is the problem...!
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sajhauser
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Posted on 09-28-06 9:08
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argggg.... check out here http://users.dickinson.edu/~braught/courses/cs132f01/classes/code/LeapYear.src.html you haven't really followed the definition kyaaaaaa!
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Slackdemic
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Posted on 09-28-06 9:16
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Hyatteri! that is just the definition. I think I have "really" followed the dang definition. I know how to google, too, Sajhauser (:P) Anyway, thanks, let me play with it...I am kind of afraid to post all my codes for you all so you would know what exactly I am talking...This is one of the big assignments that is due tomorrow, and I assume there are other guys from my class that know how to google like you and I. :P
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lootekukur
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Posted on 09-28-06 9:25
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{ f (y%100==0) { if (y%400==0) return true; -----------> means, if it is divisible by 100 AND 400, return true else return false; ------>if it is divisible ONLY by 100....return false.. } else if (y%4==0) return true; return false; } --well , as per my reading, you should have following conditions 1) the year is divisible by 4 (NOT the sufficient condition, so you have to look into) (a) is the year divisible by 4 and not by 100? if yes, it's a leap year else not (b) is the year divisible by 4 and by 100? (NOT the sufficient condition, so you have to look into) (i)is the year also divisible by 400 as well? if yes, it's a leap year, else not obviously, it's not a leap yr if its not divisible by 4. sajhauser is right and she provided the link as well. you should have gone through it :P LooTe
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sajhauser
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Posted on 09-28-06 9:27
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you haven't applied the dang logic behind the definition! you have made assumption as if there are only 2 condition, when, infact there are 3..so you have to first check by 4. the definition first tells you to check with 4, right? // Is theYear Divisible by 4? if (theYear % 4 == 0) { // Is theYear Divisible by 4 but not 100? if (theYear % 100 != 0) { System.out.println(theYear + " is a leap year."); } // Is theYear Divisible by 4 and 100 and 400? else if (theYear % 400 == 0) { System.out.println(theYear + " is a leap year."); } // It is Divisible by 4 and 100 but not 400! else { System.out.println(theYear + " is not a leap year."); } } // It is not divisible by 4. else { System.out.println(theYear + " is not a leap year."); }
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Slackdemic
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Posted on 09-28-06 9:48
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You are right guys! I have been misplacing 400, 100, and 4. The program is whole lot more than that, but Thanks!!! You all rock!....Wish me good luck!
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sajhauser
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Posted on 09-28-06 10:25
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Good luck! and don't pre-judge me okay!
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Slackdemic
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Posted on 09-28-06 10:42
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I was not "pre-judging you, Sajhauser...My problem was actually the wrong output which didn't have much connection with the right or wrong definition of leap year. And, I was stressed. It was my understanding that was not correct. Maybe, I am little slow. :P Maybe, really, at times. The leap year is something that is divisible by 4 BUT NOT divisible by 100. But anything that is divisible 100 and 400 is still leap year. There are three conditions there: 1. Anything divisible by 4 is leap year. 2. BUT if it is not leap year if it is divisible by 100. 3. It is leap year if it is divisible by 100 and 400. This is what I did and it went well. { /*if(y % 4 ==0 ) { // divisible by 4 if(y % 400 ==0) //leap year is { if(y %100 ==0) { return false; } return true; } return true; } return false; }*/ Coincidentally, I get the right output, too. And, I am done! Thank you!
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lootekukur
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Posted on 09-28-06 10:58
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