My first code for computing a table of squares - and its not working :(

**shifu** · August 24th, 2013, 02:43 AM

public class squares {
 
	public static void main(String[] args) {
		int i =1, j=1;
		System.out.println (i);
		while (j < 40)
		{
			i=i+1;
			j=i*i;
			System.out.println(j);
		}   
 
	}
 
}

The output prints the squares till 49 even though i have given j as 40..please help!

**GregBrannon** · August 24th, 2013, 04:48 AM

Please post your code in code tags.

Changing the value of the loop control variable, in this case 'j', inside the loop is not a great idea. I recommend that you use another variable to compute the squares and print that, leaving 'j' alone.

**shifu** · August 24th, 2013, 05:07 AM

Thanks Greg

Will try that..by the way changing the order of print ( printing at the start of the loop helped too )

**The_pizzaguy** · August 24th, 2013, 05:10 AM

I have an explaination for your code.
Your code makes sqaures indeed but what happens is that when the last square is made(i = 7 ; 7 * 7= 49) the loop will stop because j is over 40.
If you want to stop the loop before it goes over 40 then you should use the square before 40 that is 36(6 * 6).
Then you should test what the sqaure is going to be before it is going to print it.

**syedbhai** · August 24th, 2013, 04:32 PM

Hello.
If you have time then using a pen and paper just trace your program line by line.
You shall know what is causing the fault. And you may be able to fix it on your own.

Syed.

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