Thread: DoubleQuadruple

I dont know how to write this code I am new to Java and one of the labs is: write a counter-controlled while loop that uses the loop control variable to take on the values 0 through 10 Remember to initialize the loop control variable before the program enters the loop. Here is the half written program that they give you. and you are suppose to write the while part. i just cant figure out how to do it.? Can someone show me how this is done? I would really apprectiate it.

// DoubleQuadruple.java - This program prints the numbers 0 through 10 along
// with these values doubled and quadrupled.
// Input:  None.
// Output: Prints the numbers 0 through 10 along with their doubles and quadruples. 
 
public class DoubleQuadruple
{
	public static void main(String args[])
	{
 
		String head1 = "Number: ";
		String head2 = "Doubled: ";
		String head3 = "Quadrupled:  ";				
		int numberCounter; 	// Numbers 0 through 10.
		int doubled;		// Stores the double of a number.
		int quadrupled; 	// Stores the quadruple of a number.
		final int NUM_LOOPS = 10; // Constant used to control loop.
 
		// This is the work done in the housekeeping() method
		System.out.println("0 through 10 doubled and quadrupled" + "\n");
 
		// This is the work done in the detailLoop() method
 
                // Initialize loop control variable.
		// Write your counter_controlled while loop here.
		    // Calculate double.
		    // Calculate quadruple.
		    System.out.println(head1 + numberCounter);
	            System.out.println(head2 + doubled);
		    System.out.println(head3 + quadrupled);
		    // Next number.
 
		// This is the work done in the endOfJob() method
                System.exit(0);
	} // End of main() method.
 
} // End of DoubleQuadruple class.

Do you understand how to use a While Loop, and what it does? Attempt to write the while loop first, and then I can help you with your logic.

This link: The while and do-while Statements (The Java™ Tutorials > Learning the Java Language > Language Basics) will teach you the basics of a while loop.

While the counter is less than 10:

double the counter and store it in another variable
quadruple the counter and store that in another variable
print the info
increment the counter by 1

Originally Posted by NewAtJava

the while loop variable I initiated was numberCounter=0;
so then I put while( numberCounter<=10){
doubled=numberCounter*2;
quadrupled=numberCounter*4;
then the system out statements
numberCounter++;
end while
im not sure if you read this but I cannot use anymore variables than the ones they have given.

Look closely at my last post, you'll notice a difference in the psuedo-code I have given from the code you have in the above quote. Determine if you want 0 through 10 all inclusive or 0 to 10 (not including 10)