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Thread: Need Help Creating a Loop.

  1. #1
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    Default Need Help Creating a Loop.

    my program compiles with no errors though I need help actually getting the program to loop. I want it to loop if yes is entered , and stop if no is entered. How would I go about doing this? can someone please provide the proper code needed? I am very new to Java and I am trying my best to learn. this program is a project from a book I am reading.

    here is my code:
    /*  Protoype program to be used to prove  first concepts Algorithm project */
     
    import java.io.*;
     
    import java.lang.*;
     
    import java.text.*;
     
    import java.util.*;
     
    //Set up public class
     
    public class  document2
     
    {
     
    //declare main() method
     
    public static void main(String[] args) throws IOException
     
    {
     
    //Declare data types
     
    float length,width,area,circum,loop,yes,no;
     
    //set up input stream
     
    Scanner  readin = new Scanner(System.in);
     
    //prompt for length
     
    System.out.println("\n\n enter value for length");
     
    //stream in length and convert to float
     
    length = readin.nextFloat();
     
    //prompt for width
     
    System.out.println("\n\n enter value for width");
     
    //stream in width and convert to float
     
    width = readin.nextFloat();
     
    //Calculate results
     
    area = length*width;
     
    circum = 2* (length + width);
     
    //prepare data for out put display
     
     DecimalFormat twodig = new DecimalFormat("########.##");
     
     System.out.print("\n\nThe results of the calcuations are\n\n\n");
     
     System.out.print("the area is:\t\t"  +  twodig.format(area) + "\n\n");
     
     System.out.println("the circumference is:\t\t" + twodig.format(circum));
     
     //prompt for loop
     
     System.out.println("\n\n calculate again YES / NO ?");
     
     //stream in width and convert to float
     
    loop = readin.nextFloat();
     
     
     
     }//end main
     
     }//end class


  2. #2
    Crazy Cat Lady KevinWorkman's Avatar
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    Default Re: Need Help Creating a Loop.

    I guess you didn't like the help you already received on another forum?

    This thread has been cross posted here:

    http://www.java-forums.org/new-java/43951-need-help-creating-loop.html

    Although cross posting is allowed, for everyone's benefit, please read:

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  3. #3
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    Default Re: Need Help Creating a Loop.

    This looks over-engineered, or I don't understand what you are doing.
    Simply put, this will continue the loop if the user enters yes, and discontinue it if the user enters no.
    import java.util.Scanner;
     
    public class yesOrNo{
         public static void main(String[] args){
              Scanner input = new Scanner(System.in);
              boolean yes = true;
              final String YES = "yes";
              final String NO = "no";
              String userInput;
              while(yes == true){
                   System.out.print("yes or no: ");
                   userInput = input.nextLine();
                   if (userInput == YES){
                        yes = false;
                   }
                   else if(userInput == NO){
                        yes = true;
                   }
                   else{
                        yes = true;
                   }
              }
         }
    }
    Last edited by bglueck; May 14th, 2011 at 12:32 AM. Reason: Mistake

  4. #4
    Member OutputStream's Avatar
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    Default Re: Need Help Creating a Loop.

    bglueck, don't spoonfeed. Also don't compare Strings with the equals operator (==), use equals() or equalsIgnoreCase() instead.

  5. #5
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    Default Re: Need Help Creating a Loop.

    Quote Originally Posted by OutputStream View Post
    Also don't compare Strings with the equals operator (==), use equals() or equalsIgnoreCase() instead.
    Your right. Thanks for catching my mistake.

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