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:

Code :

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/*  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

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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

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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.

Code :

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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;
               }
          }
     }
}

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

Quote:

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Originally Posted by OutputStream

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

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Your right. Thanks for catching my mistake.