Ch 3 pg 88 extra challenge on appending date value!

xiao_mao_mimi · December 13th, 2011, 01:43 PM

Hello,

Has anyone tried this?

I tried it myself and due to my skill level at the moment I've only generated dates from 1st to 10th. Try out my code and teach me how I can improve my current model to make dates from 1st to 31st. :D I use NetBeans by the way.

Code:

public class ConditionalOpDate {

    public static void main(String[] args) {
        int nDate = 1;                      // Initialize Date
        nDate = (int)(1+10*Math.random());  // Generate random Date number from 1 to 10
        
        if (nDate == 1){
            System.out.println("The date is now " + nDate + "st December.");
        }   else {
            if (nDate == 2){
                System.out.println("The date is now " + nDate + "nd December.");                
            }   else {
                if (nDate == 3){
                    System.out.println("The date is now " + nDate + "rd December.");
                }   else {
                    if (nDate > 3 && nDate <= 10){
                        System.out.println("The date is now " + nDate + "th December.");
                    }
                }   
        }
    }
  }      
}

skf001 · April 24th, 2012, 10:54 AM

I changed the number from 10 to 31*Math.random and added logical OR operators to the if statements. I also took out some braces and the last if statement. I ran it about 30 or more times and got a bunch of different results. All were correct.

Code:

public class ConditionalOpDate {
 public static void main(String[] args) {
  int nDate = 1;
  nDate = (int)(1+31*Math.random());
  if (nDate == 1 || nDate == 21 || nDate == 31){
            System.out.println("The date is now " + nDate + "st December.");
        }   else if (nDate == 2 || nDate == 22){
                System.out.println("The date is now " + nDate + "nd December.");         

       
            }   else if (nDate == 3 || nDate == 23){
                    System.out.println("The date is now " + nDate + "rd December.");
                }   else {
                        System.out.println("The date is now " + nDate + "th December.");
                    }
                }   
        }

javaKid1337 · May 1st, 2012, 06:15 AM

Here's my version of the code. It is simple and doesn't add ND,RD ot TH to the date.

Code:

import static java.lang.Math.random;
public class DateGenerate {
	public static void main(String[] args) {
		int day=(int) (1+(30*random()));
		int month=(int) (12*random());
		
		if(month>0 && month<=12) {
			if(day>0 && day<=31) {
				System.out.println("Today is " + day + "-" + month + "-2012");
			}
		}
		else {
			System.out.println("Woops! Something seems to be out of range");
		}
	}
}

javaKid1337 · May 1st, 2012, 09:17 AM

Here is teh one to append the end to the date using NESTED CONDITIONAL OPERATOR :)

Code:

import static java.lang.Math.random;
public class AppendDate {
	public static void main(String[] args)
	{
		int day = (int) (1+(31*random()));
		
		if(day>0 && day<=31)
		{
			System.out.println("Today is : " + day + ((day==1||day==21||day==31) ? "st" : (day==2||day==22) ? "nd" : (day==3||day==23)?"rd" : "th") + " Of December");
		}
	}
}

skf001 · May 4th, 2012, 01:51 PM

I didn't know you could use the conditional operator repeatedly like that. That is wicked. Where did you see how to do that?

javaKid1337 · May 6th, 2012, 05:21 AM

Quote:

Originally Posted by skf001

I didn't know you could use the conditional operator repeatedly like that. That is wicked. Where did you see how to do that?

I learnt this when I was learning C.
I studied C from 'Let Us C' by Yeshwant Kanetkar.
Nice book :)