Java loops

MungBean · 06-06-2011 05:21PM #1

Hi guys. Having trouble with this very simple program

. I copied the code exact from the book but I get different results. Anyone know where I went wrong and can point me towards a fix ?

public class DisplayStars
{
public static void main(String[] args)
{
int num;
System.out.println("Size of squares?");
num = EasyIn.getInt();
for (int i = 1; i <= num; i++)
{
for (int j = 1; j <= num; j++)
{
System.out.println("*");
}
System.out.println();
}
EasyIn.pause();
}
}

Its suppose to print a square of stars but prints them all on different lines.

Instead of
***
***
***

I get
*
*
*

*
*
*

*
*
*

dumb_parade · 06-06-2011 05:25PM

public class DisplayStars
{
public static void main(String[] args)
{
int num;
System.out.println("Size of squares?");
num = EasyIn.getInt();
for (int i = 1; i <= num; i++)
{
for (int j = 1; j <= num; j++)
{
System.out.print("*");
}
System.out.println();
}
EasyIn.pause();
}
}

See the change in bold, println writes a new line everytime, print just appends onto the current line

KMFCross · 06-06-2011 05:27PM

The println("*") is the problem it should be print("*"), the println is appending a new line each time.

Oops did'nt see dumb_parades reply.

MungBean · 06-06-2011 05:28PM

dumb_parade wrote: »

public class DisplayStars
{
public static void main(String[] args)
{
int num;
System.out.println("Size of squares?");
num = EasyIn.getInt();
for (int i = 1; i <= num; i++)
{
for (int j = 1; j <= num; j++)
{
System.out.print("*");
}
System.out.println();
}
EasyIn.pause();
}
}

See the change in bold, println writes a new line everytime, print just appends onto the current line

Ahh thanks. I feel a bit thick for not spotting that, just so used to writing println. Thanks for the help and the quick response

MungBean · 08-06-2011 07:42PM

See next post.

srsly78 · 08-06-2011 07:44PM

Gah please use code tags

MungBean · 08-06-2011 07:51PM

Another question on loops. This time the do...while loop.

In the end test

}while (input == 'y');

How can I add another option for the test to be true ? for instance if the user put Y instead of y but still work ?

Do I have to add a second loop ? or can I alter what I have?

}while (input == 'y' || 'Y')

something like that ?

You could have answered the question while you were complaining

fasty · 08-06-2011 08:18PM

You're almost right...

while(input == 'Y' || input == 'y')

Or just turn convert input to lowercase blindly if case doesn't matter!

MungBean · 08-06-2011 08:34PM

fasty wrote: »
You're almost right...
while(input == 'Y' || input == 'y')
Or just turn convert input to lowercase blindly if case doesn't matter!

Thanks

been fiddlin with that for ages.

joebloggs123 · 11-06-2011 11:29PM

what about

while("y".equalsIgnoreCase(input))

MungBean · 11-06-2011 11:44PM

joebloggs123 wrote: »
what about
while("y".equalsIgnoreCase(input))

Got an error when trying to compile.

-Trek- · 12-06-2011 12:53AM

import java.util.*;

public class WhileLoop{
        public static void main(String args[])
        {

                String userInput  = "";
                Scanner input = new Scanner(System.in);

                System.out.print("Do you wish to continue? y/n:  ");
                userInput = input.nextLine();

                while(userInput.equalsIgnoreCase("y"))
                        {
                                System.out.println("Continuing ...");

                                System.out.print("Do you wish to continue? y/n: ");
                                 userInput = input.nextLine();

                        }
        }


}

Java loops

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