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Thread: Case Switch Help?

  1. #1
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    Default Case Switch Help?

    import java.util.Scanner;
     
    public class BirthdayEdit {
     
    	public static void main (String arg[])
    	{
    		Scanner sc = new Scanner(System.in);
     
    		int birthMonth = sc.nextInt();
    		int birthDay = sc.nextInt();
    		int birthYear = (sc.nextInt() - 1900);
    		double birthYearRemainder = birthYear % 4;
    		int leap;
    		int total;
     
    		int birthMonthAdd;
    		switch (birthMonth) {
    			case 1: birthMonthAdd = 1; break;
    			case 2: birthMonthAdd = 4; break;
    			case 3: birthMonthAdd = 4; break;
    			case 4: birthMonthAdd = 0; break;
    			case 5: birthMonthAdd = 2; break;
    			case 6: birthMonthAdd = 5; break;
    			case 7: birthMonthAdd = 0; break;
    			case 8: birthMonthAdd = 3; break;
    			case 9: birthMonthAdd = 6; break;
    			case 10: birthMonthAdd = 1; break;
    			case 11: birthMonthAdd = 4; break;
    			case 12: birthMonthAdd = 6; break;
    		}
    		if (birthYearRemainder==0) {
    			leap = -1;
    		} else {
    			leap = 0;
    		}
    		total = ((birthMonthAdd + birthDay + (birthYear / 4) + birthYear + leap)%7);
    		String day;
    		if (total == 0) {
    		    day = "Saturday";
    		} else if (total == 1) {
    			day = "Sunday";
    			System.out.println("You were born on" + day);
    		} else if (total == 2) {
    			day = "Monday";
    			System.out.println("You were born on" + day);
    		} else if (total == 3) {
    			day = "Tuesday";
    			System.out.println("You were born on" + day);
    		} else if (total == 4) {
    			day = "Wednesday";
    			System.out.println("You were born on" + day);
    		} else if (total == 5) {
    			day = "Thursday";
    			System.out.println("You were born on" + day);
    		} else if (total == 6) {
    			day = "Friday";
    			System.out.println("You were born on" + day);
    		} else if (total < 0) {
    			System.out.println("An error has occurred.");
    		}
        }
    }

    Trying to design a program that tells you the day you were born. I'm getting this error:
    error: variable birthMonthAdd might not have been initialized
    total = ((birthMonthAdd + birthDay + (birthYear / 4) + birthYear + leap)%7);
    I've tried moving variables around everywhere, but I can't get it to work.


  2. #2
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    Default Re: Case Switch Help?

    Thats a very basic mistake, happens to everyone. Change
    int birthMonthAdd;
    to
    int birthMonthAdd = 0;
    It has to do with the compiler not knowing that it will actually get initialized in the switch statement

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  4. #3
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    Default Re: Case Switch Help?

    Quote Originally Posted by Tjstretch View Post
    Thats a very basic mistake, happens to everyone. Change
    int birthMonthAdd;
    to
    int birthMonthAdd = 0;
    It has to do with the compiler not knowing that it will actually get initialized in the switch statement
    Gaah! Thank you so much, it helped me lots. :]
    If you're still there I'm wondering if there will be a way to make an error code so that if my teacher types in Feburary 30th, it would give him an error. I really can't think of anything to put for it. That's only if you'd like to help again though. My program works now thanks to you! ;D

    import java.util.Scanner;
     
    public class BirthdayEdit {
     
    	public static void main (String arg[])
    	{
    		Scanner sc = new Scanner(System.in);
     
    		int birthMonth = sc.nextInt();
    		int birthDay = sc.nextInt();
    		int birthYear = (sc.nextInt() - 1900);
    		double birthYearRemainder = birthYear % 4;
    		int leap;
    		int total;
     
    		int birthMonthAdd = 0;
    		switch (birthMonth) {
    			case 1: birthMonthAdd = 1; break;
    			case 2: birthMonthAdd = 4; break;
    			case 3: birthMonthAdd = 4; break;
    			case 4: birthMonthAdd = 0; break;
    			case 5: birthMonthAdd = 2; break;
    			case 6: birthMonthAdd = 5; break;
    			case 7: birthMonthAdd = 0; break;
    			case 8: birthMonthAdd = 3; break;
    			case 9: birthMonthAdd = 6; break;
    			case 10: birthMonthAdd = 1; break;
    			case 11: birthMonthAdd = 4; break;
    			case 12: birthMonthAdd = 6; break;
    		}
    		if (birthYearRemainder==0) {
    			leap = -1;
    		} else {
    			leap = 0;
    		}
    		total = ((birthMonthAdd + birthDay + (birthYear / 4) + birthYear + leap)%7);
    		String day;
    		if (birthMonth > 12) {
    		System.out.println("Please enter a month number 1-12.");
    		} if (birthMonth <= 0) {
    		System.out.println("Please enter a month number 1-12.");
    		} if (birthYear < 0) {
    		System.out.println("The year you entered is earlier than the twentieth century.");
    		} if (total == 0) {
    		    day = "Saturday";
    		    System.out.println("You were born on a " + day);
    		} else if (total == 1) {
    			day = "Sunday";
    			System.out.println("You were born on a " + day);
    		} else if (total == 2) {
    			day = "Monday";
    			System.out.println("You were born on a " + day);
    		} else if (total == 3) {
    			day = "Tuesday";
    			System.out.println("You were born on a " + day);
    		} else if (total == 4) {
    			day = "Wednesday";
    			System.out.println("You were born on a " + day);
    		} else if (total == 5) {
    			day = "Thursday";
    			System.out.println("You were born on a " + day);
    		} else if (total == 6) {
    			day = "Friday";
    			System.out.println("You were born on a " + day);
    		} else if (total < 0) {
    			System.out.println("An error has occured.");
    		}
        }
    }

  5. #4
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    Default Re: Case Switch Help?

    You're Welcome, as to your request:

    Throwing an error:
    throw new AssertionError("Maximum 29 days in Febuary");

    Reviewed your code, you should use a switch statement, then use one println. It just looks neater.

    It would look like
    switch(total)
    {
      case 0:
        day = "Saturday";
        break;
      case 1:
        day = "Sunday";
        break;
      case 2:
        day = "Monday";
        break;
      case 3:
        day = "Tuesday";
        break;
      case 4:
        day = "Wednesday";
        break;
      case 5:
        day = "Thursday";
        break;
      case 6:
        day = "Friday";
        break;
      default:
        System.err.println("An error occurred");
        System.exit(0);
    }
    System.out.println("You were born on a "+day);
    Instead of all the else-ifs, however you would have to change
    String day;
    to
    String day = null;
    Last edited by Tjstretch; October 19th, 2011 at 07:10 PM. Reason: Added highlights

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    Default Re: Case Switch Help?

    Quote Originally Posted by Tjstretch View Post
    You're Welcome, as to your request:

    Throwing an error:
    throw new AssertionError("Maximum 29 days in Febuary");

    Reviewed your code, you should use a switch statement, then use one println. It just looks neater.

    It would look like
    switch(total)
    {
      case 0:
        day = "Saturday";
        break;
      case 1:
        day = "Sunday";
        break;
      case 2:
        day = "Monday";
        break;
      case 3:
        day = "Tuesday";
        break;
      case 4:
        day = "Wednesday";
        break;
      case 5:
        day = "Thursday";
        break;
      case 6:
        day = "Friday";
        break;
      default:
        System.err.println("An error occurred");
        System.exit(0);
    }
    System.out.println("You were born on a "+day);
    Instead of all the else-ifs, however you would have to change
    String day;
    to
    String day = null;
    It made my code much more cleaner! Thanks.
    One thing can be break the program though.
    If I enter a month number over 12, or a negative, then it will still input a day. I know I could fix it with else ifs, but anyway to do it in the way you posted?

  8. #6
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    Default Re: Case Switch Help?

    Oh, thats what you meant. Just use a while statement and an if statement, like so:
    int birthMonth = sc.nextInt();
    while(birthMonth > 12 || birthMonth < 0)
    {
      System.out.println("Invalid birth month, please input a valid number");
      birthMonth = sc.nextInt();
    }

    However, it would be best to use Integer.valueOf(sc.nextLine()), because sometimes nextInt() causes problems. I find it best just to create a helper method called getInt(sc);, like so:
    /**
     * Safely aquires an int from a scanner
     */
    private static int getInt(Scanner sc)
    {
      int num = Integer.MIN_VALUE;
      while(num == Integer.MIN_VALUE)
      {
        try
        {
          String line = sc.getLine();
          if(line.equalsIgnoreCase("exit");
             System.exit(0);
          num = Integer.valueOf(line);
        }catch(NumberFormatException e)
        {
          System.err.println("Please input a valid number");
        }
      }
    }

    For getting a valid int, use
    int birthMonth = 0;
    int birthDay = 0;
    int birthYear = 0;
     
    while(birthMonth < 1 || birthMonth > 12)
    {
      System.out.println("What is your birth month? (Must be between 1 and 12)");
      birthMonth = getInt(sc);
    }
    //You could use a long switch statement to make sure its right, but I'm going to assume
    //the highest value is 31.. you could do it if you want, I'm just to lazy atm.
    while(birthDay < 1 || birthDay > 31)
    {
      System.out.println("What is your birth day? (Must be between 1 and 31)");
      birthDay = getInt(sc);
    }
    System.out.println("What is your birth year?");
    birthYear = getInt(sc);
    Last edited by Tjstretch; October 19th, 2011 at 07:31 PM.

  9. #7
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    Default Re: Case Switch Help?

    Sorry if I'm getting over your head, I can break all the code down and explain it if you want
    Also, it will make your code look a little less to-the-point, because you have to check everything for validity.
    Last edited by Tjstretch; October 19th, 2011 at 07:42 PM.

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    Default Re: Case Switch Help?

    Quote Originally Posted by Tjstretch View Post
    Sorry if I'm getting over your head, I can break all the code down and explain it if you want
    Also, it will make your code look a little less to-the-point, because you have to check everything for validity.
    It's not really over my head, I've been coding and stuff since I was about nine, I learned HTML and CSS from neopets. x3
    And I code permissions for MineCraft.
    It's just the fact that the first program I created for this same topic worked, but it wasn't what the teacher wanted. He wanted case statements, and I was parsing. I was gone from school for two weeks and his instructions aren't always the best. Just yesterday he was talking about how you have to be "creative" with coding, but nope. I gotta recode my entire program. LOL.
    Anyways, I just added a couple of else if statements to the end.

    import java.util.Scanner;
     
    public class BirthdayEdit {
     
    	public static void main (String arg[])
    	{
    		Scanner sc = new Scanner(System.in);
    		int birthMonth = sc.nextInt();
    		int birthDay = sc.nextInt();
    		int birthYear = (sc.nextInt() - 1900);
    		double birthYearRemainder = birthYear % 4;
    		int leap;
    		int total;
    		int birthMonthAdd = 0;
    		switch (birthMonth) {
    			case 1: birthMonthAdd = 1; break;
    			case 2: birthMonthAdd = 4; break;
    			case 3: birthMonthAdd = 4; break;
    			case 4: birthMonthAdd = 0; break;
    			case 5: birthMonthAdd = 2; break;
    			case 6: birthMonthAdd = 5; break;
    			case 7: birthMonthAdd = 0; break;
    			case 8: birthMonthAdd = 3; break;
    			case 9: birthMonthAdd = 6; break;
    			case 10: birthMonthAdd = 1; break;
    			case 11: birthMonthAdd = 4; break;
    			case 12: birthMonthAdd = 6; break;
    		}
    		if (birthYearRemainder==0) {
    			leap = -1;
    		} else {
    			leap = 0;
    		}
    		total = ((birthMonthAdd + birthDay + (birthYear / 4) + birthYear + leap)%7);
    		String day = null;
    		switch(total) {
            case 0:
            day = "Saturday";
            break;
            case 1:
            day = "Sunday";
            break;
            case 2:
            day = "Monday";
            break;
            case 3:
            day = "Tuesday";
            break;
            case 4:
            day = "Wednesday";
            break;
            case 5:
            day = "Thursday";
            break;
            case 6:
            day = "Friday";
            break;
            default:
            System.err.println("An error occurred.");
            System.exit(0);
    		}
    		if(birthMonth > 12 || birthMonth < 0) {
            System.out.println("An error occurred.");
            } else if (birthYear > 101 || birthYear < 1) {
            System.out.println("An error occurred.");
            } else {
            System.out.println("You were born on a " +day);
            }
        }
    }

    Ended up with that. Works well for me. The only thing that I can't think of a way to counter is if he asks me to put in February 30th.
    Also, do you know a way to make the program loop until I put "stop" or something to make the program complete?

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    Default Re: Case Switch Help?

    Ok, 2 things. You should change
    int birthMonth = sc.nextInt();
    int birthDay = sc.nextInt();
    int birthYear = (sc.nextInt() - 1900);
    to
    System.out.println("What is your birth month?");
    int birthMonth = sc.nextInt();
    System.out.println("What is your birth day?");
    int birthDay = sc.nextInt();
    System.out.println("What is your birth year?");
    int birthYear = (sc.nextInt() - 1900);

    Then, wrap everything after
    Scanner sc = new Scanner(System.in)
    with a big while statement waiting for a boolean. It's easier to do then explain.
    While statements link is here
    import java.util.Scanner;
     
    public class BirthdayEdit {
     
      public static void main (String arg[])
      {
        Scanner sc = new Scanner(System.in);
        boolean cont = true;
        while(cont)
        {
          System.out.println("What is your birth month?");
          int birthMonth = sc.nextInt();
          System.out.println("What is your birth day?");
          int birthDay = sc.nextInt();
          System.out.println("What is your birth year?");
          int birthYear = (sc.nextInt() - 1900);
          double birthYearRemainder = birthYear % 4;
          int leap;
          int total;
          int birthMonthAdd = 0;
          switch (birthMonth) {
            case 1: birthMonthAdd = 1; break;
            case 2: birthMonthAdd = 4; break;
            case 3: birthMonthAdd = 4; break;
            case 4: birthMonthAdd = 0; break;
            case 5: birthMonthAdd = 2; break;
            case 6: birthMonthAdd = 5; break;
            case 7: birthMonthAdd = 0; break;
            case 8: birthMonthAdd = 3; break;
            case 9: birthMonthAdd = 6; break;
            case 10: birthMonthAdd = 1; break;
            case 11: birthMonthAdd = 4; break;
            case 12: birthMonthAdd = 6; break;
          }
          if (birthYearRemainder==0) {
            leap = -1;
          } else {
            leap = 0;
          }
          total = ((birthMonthAdd + birthDay + (birthYear / 4) + birthYear + leap)%7);
          String day = null;
          switch(total) {
            case 0:
              day = "Saturday";
              break;
            case 1:
              day = "Sunday";
              break;
            case 2:
              day = "Monday";
              break;
            case 3:
              day = "Tuesday";
              break;
            case 4:
              day = "Wednesday";
              break;
            case 5:
              day = "Thursday";
              break;
            case 6:
              day = "Friday";
              break;
            default:
              System.err.println("An error occurred.");
              System.exit(0);
          }
          if(birthMonth > 12 || birthMonth < 0) {
            System.out.println("An error occurred.");
          } else if (birthYear > 101 || birthYear < 1) {
            System.out.println("An error occurred.");
          } else {
            System.out.println("You were born on a " +day);
          }
          System.out.println("Continue?");
          cont = !in.nextLine().equalsIgnoreCase("stop");
        }
      }
    }

  12. #10
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    Default Re: Case Switch Help?

    As for checking if its not Febuary 30th, add this with all your other validity checks
    else if(birthMonth == 2 && birthDay == 30)
    {
      System.out.println("Invalid day!");
      break;
    }

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    Default Re: Case Switch Help?

    Quote Originally Posted by Tjstretch View Post
    Ok, 2 things. You should change
    int birthMonth = sc.nextInt();
    int birthDay = sc.nextInt();
    int birthYear = (sc.nextInt() - 1900);
    to
    System.out.println("What is your birth month?");
    int birthMonth = sc.nextInt();
    System.out.println("What is your birth day?");
    int birthDay = sc.nextInt();
    System.out.println("What is your birth year?");
    int birthYear = (sc.nextInt() - 1900);

    Then, wrap everything after
    Scanner sc = new Scanner(System.in)
    with a big while statement waiting for a boolean. It's easier to do then explain.
    While statements link is here
    import java.util.Scanner;
     
    public class BirthdayEdit {
     
      public static void main (String arg[])
      {
        Scanner sc = new Scanner(System.in);
        boolean cont = true;
        while(cont)
        {
          System.out.println("What is your birth month?");
          int birthMonth = sc.nextInt();
          System.out.println("What is your birth day?");
          int birthDay = sc.nextInt();
          System.out.println("What is your birth year?");
          int birthYear = (sc.nextInt() - 1900);
          double birthYearRemainder = birthYear % 4;
          int leap;
          int total;
          int birthMonthAdd = 0;
          switch (birthMonth) {
            case 1: birthMonthAdd = 1; break;
            case 2: birthMonthAdd = 4; break;
            case 3: birthMonthAdd = 4; break;
            case 4: birthMonthAdd = 0; break;
            case 5: birthMonthAdd = 2; break;
            case 6: birthMonthAdd = 5; break;
            case 7: birthMonthAdd = 0; break;
            case 8: birthMonthAdd = 3; break;
            case 9: birthMonthAdd = 6; break;
            case 10: birthMonthAdd = 1; break;
            case 11: birthMonthAdd = 4; break;
            case 12: birthMonthAdd = 6; break;
          }
          if (birthYearRemainder==0) {
            leap = -1;
          } else {
            leap = 0;
          }
          total = ((birthMonthAdd + birthDay + (birthYear / 4) + birthYear + leap)%7);
          String day = null;
          switch(total) {
            case 0:
              day = "Saturday";
              break;
            case 1:
              day = "Sunday";
              break;
            case 2:
              day = "Monday";
              break;
            case 3:
              day = "Tuesday";
              break;
            case 4:
              day = "Wednesday";
              break;
            case 5:
              day = "Thursday";
              break;
            case 6:
              day = "Friday";
              break;
            default:
              System.err.println("An error occurred.");
              System.exit(0);
          }
          if(birthMonth > 12 || birthMonth < 0) {
            System.out.println("An error occurred.");
          } else if (birthYear > 101 || birthYear < 1) {
            System.out.println("An error occurred.");
          } else {
            System.out.println("You were born on a " +day);
          }
          System.out.println("Continue?");
          cont = !in.nextLine().equalsIgnoreCase("stop");
        }
      }
    }
    Thing is, teacher just wanted me to input three numbers like so:
    10 20 1990
    And when you hit enter it tells you the day you were born.
    Would this still be possible to do in a while statement?

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    Default Re: Case Switch Help?

    Yes, it would do that with the above code, except it would ask
    "Continue?"
    after all that. Run the code and see for yourself

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    Default Re: Case Switch Help?

    Am I placing the while in the beginning of the program?
    If I do it like that, it's giving me multiple errors.

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    Default Re: Case Switch Help?

    I edited the code that I posted, look at how I did it.

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    Default Re: Case Switch Help?

    I got it working now, but what do I type after Continue pops up?
    I'm inputting cont, yes, true, and each just ends the process.
    Well, it gives this:
    Exception in thread "main" java.util.InputMismatchException
    at java.util.Scanner.throwFor(Scanner.java:909)
    at java.util.Scanner.next(Scanner.java:1530)
    at java.util.Scanner.nextInt(Scanner.java:2160)
    at java.util.Scanner.nextInt(Scanner.java:2119)
    at BirthdayEdit.main(BirthdayEdit.java:14)

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    Default Re: Case Switch Help?

    Hmm thats interesting, one second

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    Default Re: Case Switch Help?

    import java.util.Scanner;
     
    public class BirthdayEdit {
     
    	public static void main (String arg[])
    	{
    		Scanner sc = new Scanner(System.in);
    		boolean cont = true;
    		while(cont) {
    		int birthMonth = sc.nextInt();
    		int birthDay = sc.nextInt();
    		int birthYear = (sc.nextInt() - 1900);
    		double birthYearRemainder = birthYear % 4;
    		int leap;
    		int total;
    		int birthMonthAdd = 0;
    		switch (birthMonth) {
    			case 1: birthMonthAdd = 1; break;
    			case 2: birthMonthAdd = 4; break;
    			case 3: birthMonthAdd = 4; break;
    			case 4: birthMonthAdd = 0; break;
    			case 5: birthMonthAdd = 2; break;
    			case 6: birthMonthAdd = 5; break;
    			case 7: birthMonthAdd = 0; break;
    			case 8: birthMonthAdd = 3; break;
    			case 9: birthMonthAdd = 6; break;
    			case 10: birthMonthAdd = 1; break;
    			case 11: birthMonthAdd = 4; break;
    			case 12: birthMonthAdd = 6; break;
    		}
    		if (birthYearRemainder==0) {
    			leap = -1;
    		} else {
    			leap = 0;
    		}
    		total = ((birthMonthAdd + birthDay + (birthYear / 4) + birthYear + leap)%7);
    		String day = null;
    		switch(total) {
            case 0:
            day = "Saturday";
            break;
            case 1:
            day = "Sunday";
            break;
            case 2:
            day = "Monday";
            break;
            case 3:
            day = "Tuesday";
            break;
            case 4:
            day = "Wednesday";
            break;
            case 5:
            day = "Thursday";
            break;
            case 6:
            day = "Friday";
            break;
            default:
            System.err.println("An error occurred.");
            System.exit(0);
    		}
    		if(birthMonth > 12 || birthMonth < 0) {
            System.out.println("An error occurred.");
            } else if (birthYear > 101 || birthYear < 1) {
            System.out.println("An error occurred.");
            } else if (birthMonth == 2 && birthDay >= 30) {
            System.out.println("An error occurred.");
            } else {
            System.out.println("You were born on a " +day);
            }
            System.out.println("Continue?");
            cont = !sc.nextLine().equalsIgnoreCase("stop");
    		}
        }
    }

    That's my code at the moment.

  21. #18
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    Default Re: Case Switch Help?

    Ok I got it working with:
    import java.util.Scanner;
     
    public class BirthdayEdit {
     
      public static void main (String arg[])
      {
        Scanner sc = new Scanner(System.in);
        boolean cont = true;
        while(cont)
        {
          System.out.println("What is your birth month?");
          int birthMonth = sc.nextInt();
          System.out.println("What is your birth day?");
          int birthDay = sc.nextInt();
          System.out.println("What is your birth year?");
          int birthYear = (sc.nextInt() - 1900);
          double birthYearRemainder = birthYear % 4;
          int leap;
          int total;
          int birthMonthAdd = 0;
          switch (birthMonth) {
            case 1: birthMonthAdd = 1; break;
            case 2: birthMonthAdd = 4; break;
            case 3: birthMonthAdd = 4; break;
            case 4: birthMonthAdd = 0; break;
            case 5: birthMonthAdd = 2; break;
            case 6: birthMonthAdd = 5; break;
            case 7: birthMonthAdd = 0; break;
            case 8: birthMonthAdd = 3; break;
            case 9: birthMonthAdd = 6; break;
            case 10: birthMonthAdd = 1; break;
            case 11: birthMonthAdd = 4; break;
            case 12: birthMonthAdd = 6; break;
          }
          if (birthYearRemainder==0) {
            leap = -1;
          } else {
            leap = 0;
          }
          total = ((birthMonthAdd + birthDay + (birthYear / 4) + birthYear + leap)%7);
          String day = null;
          switch(total) {
            case 0:
              day = "Saturday";
              break;
            case 1:
              day = "Sunday";
              break;
            case 2:
              day = "Monday";
              break;
            case 3:
              day = "Tuesday";
              break;
            case 4:
              day = "Wednesday";
              break;
            case 5:
              day = "Thursday";
              break;
            case 6:
              day = "Friday";
              break;
            default:
              System.err.println("An error occurred.");
              System.exit(0);
          }
          if(birthMonth > 12 || birthMonth < 0) {
            System.out.println("An error occurred.");
          } else if (birthYear > 101 || birthYear < 1) {
            System.out.println("An error occurred.");
          } else if (birthMonth == 2 && birthDay >= 30) {
            System.out.println("An error occurred.");
          } else {
            System.out.println("You were born on a " +day);
          }
          System.out.println("Continue?");
          sc.nextLine();
          cont = !sc.nextLine().equalsIgnoreCase("no");
        }
      }
    }

    The problem seems to be that the sc.nextInt() was doing funky stuff again, type no to discontinue
    Last edited by Tjstretch; October 19th, 2011 at 09:01 PM.

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