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Thread: Trying to get user input to work correctly

  1. #1
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    Default Trying to get user input to work correctly

    I have a towers of hanoi puzzle program that is getting closer to being done. My problem right now is trying to get my input from the user to work properly.

    If they type 'v' or 'V', then the steps to solve the puzzle will be displayed (Hence the output would be 'Move Disc from S to D' and so forth) . Else, if the user does not type 'v' or 'V', then the program proceeds with in solving the puzzle, displaying the Total moves but not displaying the steps.

    The problem I am having is the options aren't working like they are supposed to.

    Now the only thing wrong is when the user input's 'v' or 'V', the moves are not displayed correctly. Output:
    Enter the min number of discs : 
    2
    Press 'v' or 'V' for a list of moves
    v
     Move disc from needle S to A
     Total Moves : 3

    How can I accomplish having the moves displayed if the user types 'v' or 'V', and if the user types some other than this the output just displays the 'Total Moves'?

    Here is my code:

    import java.util.*;
     
    import java.util.Scanner;
     
    public class TowerOfHanoi4 {
       static int moves=0;
       public static void main(String[] args) {
     
       System.out.println("Enter the min number of discs : ");
            Scanner scanner = new Scanner(System.in);
            int iHtMn = scanner.nextInt();       //iHeightMin         
     
            char source='S', auxiliary='D', destination='A';       //name poles or 'Needles'
     
       System.out.println("Press 'v' or 'V' for a list of moves");     
            Scanner show = new Scanner(System.in);
            String c = show.next();
            // char lstep='v', lsteps='V';       // grab option v or V
     
       if (c.equalsIgnoreCase("v")){        //if option is not v or V, execute code and only display total moves
        hanoi(iHtMn, source, destination, auxiliary); //else, user typed v or V and moves are displayed
        System.out.println(" Move disc from needle "+source+" to "+destination);
        System.out.println(" Total Moves : "+moves);
       } else {
          hanoi(iHtMn, source, destination, auxiliary);
          System.out.println(" Total Moves : "+moves);
         }  
       }
     
     
       public static void hanoi(int htmn,char  source,char  destination,char  auxiliary)
          {
          if (htmn >=1)
              {
                 hanoi(htmn-1, source, auxiliary, destination); // move n-1 disks from source to auxilary
                  // System.out.println(" Move disc from needle "+source+" to "+destination); // move nth disk to destination
                 moves++;     
                 hanoi(htmn-1, auxiliary, destination, source);//move n-1 disks from auxiliary to Destination
              }
          }
    }
    Last edited by jcfor3ver; November 5th, 2013 at 09:33 PM. Reason: updated code, still not functioning properly though


  2. #2
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    Default Re: Trying to get user input to work correctly

    What problems are you having? Are you working on the design or on coding from the design?
    Do you have any specific questions?
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: Trying to get user input to work correctly

    How do I get the user option 'v' or 'V' to display all of the moves? And in the same question, if they do not type 'v' or 'V', how do I just execute the program without displaying the moves??

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    Default Re: Trying to get user input to work correctly

    If you read user input as a String you can use the equalsIgnoreCase method.
    Improving the world one idiot at a time!

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    Default Re: Trying to get user input to work correctly

    Updated code above!!! Only problem I am having now is displaying the moves when the option v or V is typed.

  6. #6
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    Default Re: Trying to get user input to work correctly

    Use a boolean variable to remember that the user has entered the v/V and test it to know if a move is to be displayed.
    If you don't understand my answer, don't ignore it, ask a question.

  7. #7
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    Default Re: Trying to get user input to work correctly

    just use another variable when you call hanoi function...
    import java.util.Scanner;
     
    public class TowerOfHanoi4 {
       static int moves=0;
       public static void main(String[] args) {
    	   System.out.println("Enter the min number of discs : ");
    	   Scanner scanner = new Scanner(System.in);
    	   int iHtMn = scanner.nextInt();		//iHeightMin
    	   char source='S', auxiliary='A', destination='D';		//name poles or 'Needles'
    	   System.out.println("Press 'v' or 'V' for a list of moves");
    	   Scanner show = new Scanner(System.in);
    	    String c = show.next();
    		   hanoi(iHtMn, source, destination, auxiliary,c);
    		   System.out.println(" Total Moves : "+moves);
     
    	   show.close();
    	   scanner.close();
       }
       public static void hanoi(int htmn,char  source,char  destination,char  auxiliary, String c){
    	   if (htmn >=1){
    		   hanoi(htmn-1, source, auxiliary, destination,c);		// move n-1 disks from source to auxiliary
    		   if(c.equalsIgnoreCase("v"))
    		   System.out.println(" Move disc from needle "+source+" to "+destination); 		// move nth disk to destination
    		   moves++;     
    		   hanoi(htmn-1, auxiliary, destination, source,c);		//move n-1 disks from auxiliary to Destination
    		   }
    	   }
       }
    Last edited by aprabhat; November 7th, 2013 at 12:09 AM. Reason: forgot to add code tags

  8. #8
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    Default Re: Trying to get user input to work correctly

    @aprabhat
    Please edit your post and wrap your code with code tags:
    [code=java]
    YOUR CODE HERE
    [/code]
    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

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