Making a calendar program?

[jsnnyj]

Hi, right now I need to make a program that you have to input the day that the first date of a month falls upon ( for example, Tuesday, Friday,etc) and then outputs the days of the month and the corresponding days.

I thought this would be easy but now I'm stuck. I have a date[] array of 31 elements, but how can I don't quite get how to assign the days for the dates, because it doesn't have to start from 1 to 7.

Any help is greatly appreciated, thx!

[Justin_]

Does this program have to address there are varying amounts of days in each month?

Try making a class to include information for each day, like name of day and number, then make an array of them. Then find an efficient way to initialize them with all the information. Then design a method you can call in a loop for all the objects in the array that will say what their information is.

[jsnnyj]

Justin_ wrote:

Does this program have to address there are varying amounts of days in each month?

Try making a class to include information for each day, like name of day and number, then make an array of them. Then find an efficient way to initialize them with all the information. Then design a method you can call in a loop for all the objects in the array that will say what their information is.

No, it should assume that the month has 31 days. The parts I don't get is how to initialize it and output the information.

[Justin_]

if it is always 31 days than you could make a day array that holds all the days of the week. (monday, tues etc..) then make an array of 31 Days. Day being the name of your class. Then make its day and number private, make a method called editDay(string day) and make the method set day to whatever day is. Same sort of thing for number.

Then to initialize it, in your main function you'd write

Java:

for (int i ; i <= 31 ; i++) {      Day[i].editDay(day[i % 7]); }

the 1 % 7 incase you don't know what that is, dont' worry about it, just make sure you day array hold the seven days of the week [monday, tuesday etc..] and you can use i % 7 to keep the bounds within that array even though i gets much larger.

hint: since the user inputs the first day, you'll have to make the day array begin initializing on the day the user inputs.

[Justin_]

Here, this should give you a good idea of what I am talking about. Remember this is just one way to do it, and I hope this is what you wanted. If not, than I misunderstood the guidelines.

Java:

import java.io.*; public class Test {         public static void main(String[] args)         {                 try                 {                                         String[] day = {"Mon","Tues","Wed","Thur","Fri","Sat","Sun"};                         Day[] month = new Day[31];                         String start_day;                         int day_in_array = 0;                         BufferedReader input = new BufferedReader(new InputStreamReader(System.in));                                                 System.out.println("What is the starting day of the month? (Mon,Tues,Wed, Thur, Fri, Sat, Sun");                         start_day = input.readLine();                         for (int i = 0 ; i <= 6 ; i++)                         {                                 if (start_day.equals(day[i]))                                 {                                         day_in_array = i;                                         break;                                 }                            }                         for (int i = 0; i <= 30 ; i++)                         {                                 month[i] = new Day();                         }                         for (int i = 0; i <= 30; i++)                         {                                 month[i].editDay(day[(i + day_in_array) % 7], i);                                 month[i].sayInfo();                         }                                 }                 catch (Exception e)                 {                         System.out.println(e);                 }                         //      System.out.println("fuck");         } } class Day {         private int number;         private String day;         public void Day()         {                 day = "Mon";                 number = 1;                   }         public void editDay(String a_day,int i)         {                 day = a_day;                 number = i + 1;         }         public void sayInfo()         {                 System.out.println(day + " the " + number + "th");         } }

[jsnnyj]

thank you for the help !

[Martin]

Just for fun, in Ruby

Ruby:

#Everything except wtd's code is public domain. Have fun. #wtd's enum code def enum(*args)     args.each_with_index do |arg, index|         Object.const_set(arg,index)     end end enum :SUNDAY,:MONDAY,:TUESDAY,:WEDNESDAY,:THURSDAY,:FRIDAY,:SATURDAY #Draw a calandar of num_days days starting on day start_day def draw_cal (num_days, start_day)     puts "S  M  T  W  T  F  S"     line = "   "*start_day     index = start_day     (1..num_days).each do |day|         if index == 7             puts line             line=""             index=0         end                 line += day.to_s + " "*(3-day.to_s.length)         index += 1     end     puts line end puts "   MARCH 2006" draw_cal(31,WEDNESDAY)

The enum simply defines SUNDAY as 0, MONDAY as 1, TUESDAY as 2, etc.

And with colour!

Ruby:

#Everything except wtd's code is public domain. Have fun. #wtd's enum code def enum(*args)     args.each_with_index do |arg, index|         Object.const_set(arg,index)     end end enum :SUNDAY,:MONDAY,:TUESDAY,:WEDNESDAY,:THURSDAY,:FRIDAY,:SATURDAY #Draw a calandar of num_days days starting on day start_day def draw_cal (num_days, start_day, holidays)     puts "S  M  T  W  T  F  S"     line = "   "*start_day     index = start_day     (1..num_days).each do |day|         if index == 7             puts line             line="\e[32m"             index=0         end         line += "\e[33m" if holidays.include? day         line += day.to_s + " "*(3-day.to_s.length)         line += "\e[0m" if index==0 or holidays.include? day         index += 1     end     puts line end puts "\e[33m   MARCH 2006\e[0m" draw_cal(31,WEDNESDAY,[4, 15, 21])

[wtd]

Martin, this:

code:

(1..num_days).each do |day|          if index == 7              puts line              line=""              index=0          end

Is better written as:

code:

1.upto num_days do |day|          if index == 7              puts line              line = ""              index = 0          end

[wtd]

Ruby:

#Everything except wtd's code is public domain. Have fun.   #wtd's enum code def enum(*args)    args.each_with_index do |arg, index|       Object.const_set(arg,index)    end end   enum :SUNDAY,:MONDAY,:TUESDAY,:WEDNESDAY,:THURSDAY,:FRIDAY,:SATURDAY   #Draw a calandar of num_days days starting on day start_day class Calendar    attr_accessor :month, :year, :num_days, :start_day    def initialize(month, year, num_days, start_day)       @month, @year = month, year       @start_day, @num_days = start_day, num_days       @buffer = "#{month} #{year}".center(20)       @buffer += "\nS  M  T  W  T  F  S"       @buffer += "\n#{"   " * start_day}"       1.upto num_days do |day|          @buffer += "#{day.to_s.ljust(3)}#{"\n" if (day + start_day) % 7 == 0}"       end    end       def to_s       @buffer    end end   puts Calendar.new("March", 2006, 31, WEDNESDAY)

[McKenzie]

I hate to point out the obvious, but "Java Help" should result in Java code.

[wtd]

Talk to Martin.

Once it was said, though, I thought it worthwhile to have the best code possible available.

Ruby's pretty straightforward, and expressive. I don't think it'd be too hard to take that code and translate it to Java.