Hi. My first question.

[Stephen Carter]

Hi, I would have registered earlier, but everytime I have seen a google search result that inlcuded this site, the questions were all 3, 4 or 5 years old, so I thought this site was dead... sorry!

Anyway, I do have a problem that two other forums have not been able to help me with.

Starting from lines 79-95 lies my problem. While there is no error in the code, and the && operator works perfectly, I do not want the message "tomorrow" to appear if a user enters a future day a week or more later. I will include two outputs at the bottom.
Thanks.

/* Carter
*  03/24/14
*  End of chapter 3.5
*/

import java.util.Scanner;

public class TimeTravel
{
   public static void main (String [] args)
   {
      Scanner input = new Scanner(System.in);
         
         //  Prompt user to enter an integer for today
         System.out.println ("Please enter an integer for today's day...");
         int today = input.nextInt ();
            
            //  This allows user to be sure they put in the
            //   correct day when asked for future day
            if (today == 0)
               System.out.println ("Today is Sunday");
            if (today == 1)
               System.out.println ("Today is Monday");
            if (today == 2)
               System.out.println ("Today is Tuesday");
            if (today == 3)
               System.out.println ("Today is Wednesday");
            if (today == 4)
               System.out.println ("Today is Thursday");
            if (today == 5)
               System.out.println ("Today is Friday");
            if (today == 6)
               System.out.println ("Today is Saturday");
               
                  else 
                  System.out.println ("Correct?");
         
         //  Prompt user for integer of future day for output display
         System.out.println (
            "Please enter the numbers of days elasped from today...");
         int future = input.nextInt ();
         
            future = (today + future)% 6;    
            
             
         //  Get rid of symbol, since it doesn't exist
            String presentDay = null;
            String futureDay = null;  
            
      
         //  Present Day
                  
         switch (today) {
            case 0 : presentDay = "Sunday"; break;
            case 1 : presentDay = "Monday"; break;
            case 2 : presentDay = "Tuesday"; break;
            case 3 : presentDay = "Wednesday"; break;
            case 4 : presentDay = "Thursday"; break;
            case 5 : presentDay = "Friday"; break;
            case 6 : presentDay = "Saturday"; break;
            }
      
         //  Future days
         
         switch (future) {
            case 0 : futureDay = "Sunday"; break;
            case 1 : futureDay = "Monday"; break;
            case 2 : futureDay = "Tuesday"; break;
            case 3 : futureDay = "Wednesday"; break;
            case 4 : futureDay = "Thursday"; break;
            case 5 : futureDay = "Friday"; break;
            case 6 : futureDay = "Saturday"; break;
            }
      
      
         System.out.println("Today is " + presentDay
            + " and the future day is " + futureDay);

         //  Message includes the word tomorrow if next day 
                      /******   Method is flawed.  ******/
                      /******   Try entering 1 & 43 ******/
         if (today == 0 && future == 1)
            System.out.println (
               "Today is Sunday and tomorrow is Monday");
         if (today == 1 && future == 2)
            System.out.println (
               "Today is Monday and tomorrow is Tuesday");
         if (today == 2 && future == 3)
            System.out.println (
               "Today is Tuesday and tomorrow is Wednesday");
         if (today == 3 && future == 4)
            System.out.println (
               "Today is Wednesday and tomorrow is Thursday");
         if (today == 4 && future == 5)
            System.out.println (
               "Today is Thursday and tomorrow is Friday");
         if (today == 5 && future == 6)
            System.out.println (
               "Today is Friday and tomorrow is Saturday");
         if (today == 6 && future == 0)
            System.out.println (
               "Today is Saturday and tomorrow is Sunday");
               
               else
               System.out.println ("Thanks for playing!");
               
         //  Terminate "Tomorrow"
        
            
   }  //  End Method
}  //  End Class

 ----jGRASP exec: java TimeTravel

Please enter an integer for today's day...
1
Today is Monday
Correct?
Please enter the numbers of days elapsed from today...
2
Today is Monday and the future day is Wednesday
Thanks for playing!

 ----jGRASP: operation complete.

\Here is my problem

 ----jGRASP exec: java TimeTravel

Please enter an integer for today's day...
1
Today is Monday
Correct?
Please enter the numbers of days elapsed from today...
43
Today is Monday and the future day is Tuesday
Today is Monday and tomorrow is Tuesday
Thanks for playing!

 ----jGRASP: operation complete.

The whole purpose of the tomorrow code was to output tomorrow is Tuesday, instead of "Today is Monday and the future day is Tuesday."

[Campbell Ritchie]

Welcome to the Ranch

Why are you using % 6 when there are 7 days in the week?

[Stephen Carter]

Campbell Ritchie wrote:Welcome to the Ranch

Why are you using % 6 when there are 7 days in the week?

Because 0 = Sunday and so on.


I am at

if (future + today >= 6)
then

That's as far as I have gotten.

using blocks to label blocks of code?
block1 : {
code
/code
}

if (future + today >= 6)
break block1;

[Campbell Ritchie]

If you use % 6 you will never get a result above 5.

[Campbell Ritchie]

Stephen Carter wrote: . . .

using blocks to label blocks of code?
block1 : {
code
/code
}
. . .

Don't like break, labelled break even less. Others might disagree with me.

[Stephen Carter]

Campbell Ritchie wrote:If you use % 6 you will never get a result above 5.

I put it at 7. I am still learning. I am taking a College Java course.
I hope to take the Introduction to Android programming this summer.

[Tony Docherty]

To answer your original question you need to keep a record of the actual number entered for the future date and only print the 'tomorrow' bit if the number entered is less than 7.

BTW instead of the block of if statements to print the day of the week you could have an array with the names of days of the week and then you would just need to use the 'today' and/or 'future' variables as an index into the array to get the appropriate day text.

[Winston Gutkowski]

Stephen Carter wrote:I put it at 7. I am still learning. I am taking a College Java course.

Have you covered arrays yet? Because, if so, you could put your 'days of the week' (the names) in a string array (String[]); and since Java indexes are 0-based, it will work nicely with your '%' operator.

Another thing: think about writing a few methods to help you out; right now all your logic is crammed into main(), which isn't generally a good way to work.

Third: You are using switch statements in some places and 'if' stacks (which should probably be (if...else if...) in others. The first (lines 20-33) could certainly be changed to use a switch statement, which might be clearer - but the main point is: be consistent.

Fourth: Please DontWriteLongLines; it makes your post very difficult to read. I've broken them up (which unfortunately invalidates your line numbers; the new range is 82-102).

Winston