Java loops

MungBean

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

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

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

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

See next post.

srsly78

Gah please use code tags

MungBean

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

You're almost right...

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

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

MungBean

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

what about

while("y".equalsIgnoreCase(input))

MungBean

joebloggs123 wrote: »

what about

while("y".equalsIgnoreCase(input))

Got an error when trying to compile.

-Trek-

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();

                        }
        }


}