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[java] Checking for a valid date

fadilthrejk · 2003-10-23T13:32:03

I am workin on a program to check if a date inputted by the user is valid, and output whether it''s valid or not and whether it''s a leap year. I got it all working, except for the leap year thing. I''m not sure if I have the rules right. I think this is what it is: it''s a leap year if a) it''s divisible by 400, or b) it''s divisible by 4 and it''s not divisible by 100. i dunno. I am also not sure if i''ve translated the rules into java correctly or not. here''s my code for that section: double rem = month%400; double rem2 = month%100; double rem3 = month%4; if (year < 3000 && year > 1999) { yearValid = true; if ((rem == 0) || ((rem2 > 0) && (rem3 == 0))) //Determine whether it''s a leap year { leapYear = true; } //no need to tell it to make it false otherwise, because it''s initialized } //as false Ok, i think that''s right. here''s the full code for the program. I know it''s sloppy, but I just threw most of it together in like 30 minutes or so. import cs1.Keyboard; /** * Write a description of class Dates here. * * @author David Grimsley * @version 10-22-03 */ public class Dates { /** * Main...everything is done here (in this case)...only works like that in the console tho...applets don''t even have a main method * */ public static void main(String[] args) { int month, days, year; //date read in from user int daysInMonth; //number of days in month read in boolean monthValid = true; boolean yearValid = true; boolean dayValid = true; //true if input from user is valid boolean leapYear = false; //true if user''s year is a leap year //Get integer month, day, and year from user System.out.println("Enter the month number"); month = Keyboard.readInt(); System.out.println("Enter the day of the month"); days = Keyboard.readInt(); System.out.println("Enter the year"); year = Keyboard.readInt(); //Check to see if month is valid if (month <= 12 && month >= 1) monthValid = true; else monthValid = false; int rem = month%400; int rem2 = month%100; int rem3 = month%4; if (year < 3000 && year > 1999) { yearValid = true; if ((rem == 0) || ((rem2 > 0) && (rem3 == 0))) //Determine whether it''s a leap year { leapYear = true; } //no need to tell it to make it false otherwise, because it''s initialized } //as false else yearValid = false; //Determine number of days in month int monthDays; //User number of days in month to check to see if day is valid //Probably a bit more complex than necessary, I may fix eventually if(month == 1 || month == 3 || month == 5 || month == 7 || month == 8 || month == 10 || month == 12) { monthDays = 31; if (days > 31) dayValid = false; } else{ if(leapYear && month == 2) monthDays = 29; if (days > 29) dayValid = false; else if(month == 4 || month == 6 || month == 9 || month == 11) { monthDays = 30; if (days > 30) dayValid = false; } else { monthDays = 28; if (days > 28) { dayValid = false; } } } //Determine whether date is valid and print appropriate message if (monthValid == true && yearValid == true && dayValid == true) { System.out.println("Date is valid"); if (leapYear) System.out.println("Leap year"); } else System.out.println("Date is not valid"); } //end main() } //end class Dates if anyone can help me, thanks. if not, i''ll figure it out on my own eventually.

General and Gameplay Programming Programming

Started by fadilthrejk October 22, 2003 02:34 PM

10 comments, last by fadilthrejk 20 years, 5 months ago

garazdawi

145

October 23, 2003 11:58 AM

quote:Original post by fadilthrejk
Wow! I never noticed that before.

yae.... it''s a pretty wicked place to go and have a look at how the pro''s do it..... and the heavy use of Overloads all over the place is just amazing.... they really have a thing for overloadeing all methods and constriuctors atleast five times per class...... and looking at the source you can see that the command needed to make these overloads is minimal.....

garazdawi - 'I put the laughter back in slaughter'

fadilthrejk

100

Author

October 23, 2003 01:32 PM

well, it was for a class, but i''d rather come up with the best I can on my own before going to other sources. i just started the course, so my teacher doesn''t really expect me to do all that, and i don''t want him to expect me to make great programs that use all the prebuilt classes and stuff all the time, at least not until later in the year. and i think he''d rather have me think on my own first then use others'' work, even though it would be easier and more efficient to do so. it enforces creative thinking or something.

[java] Checking for a valid date

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[java] Checking for a valid date

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