Number Grid

[Alexis Panopoulos]

Hi guys

I wonder if anybody can help me with this little problem that I am having with a Java app.
I would like to display a kind of grid of numbers starting from 0 to 100 and with 10 rows, each row showing 10 numbers, so the first row would have 0 to 10 and the second would show 11 to 20 etc.
Example output:

0 1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20

I have this so far but I am so lost

public class Main {

public static void main(String []args) {

for(int x=0; x<9; x++) {
for(int i=0; i<=10;i++) {
System.out.println(i + x);
}
System.out.println();
}
}
}

Any help would be greatly appreciated guys!
This is not any class task or assignment, I'm just interested to see how it's done:)

[fred rosenberger]

And what is wrong with this code? Does it compile? Does it run? throw an error?

It helps us tremendously if you TellTheDetails.

Here is a hint though...

What does "System.out.println" do that "System.out.print" doesn't?

UPDATE:
I looked a little closer...and I think there is more wrong here than I initially thought...

perhaps you should go back and think through what you want to do. Programming is really 90% thinking, and only 10% typing. So tell us in English what you want to happen. Your example is confusing as well. You say you want to print 10 numbers per row, but your example has ELEVEN numbers on the first line...

[Alexis Panopoulos]

Okay thank you, I thought about it some more and finally got it to work, final code:

public class hi {

public static void main(String[]args) {
int[] row = new int[11];

for(int i=0; i<=9;i++) {
for(int j=1; j<=10;j++) {
row[j] = (10*i)+j;
System.out.print(row[j] + " ");

}
System.out.println();
}

}

}


Output:


1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50
51 52 53 54 55 56 57 58 59 60
61 62 63 64 65 66 67 68 69 70
71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90
91 92 93 94 95 96 97 98 99 100

[Campbell Ritchie]

Well done

Now some challenges for improvement.

1: Print it out with equal spacing, so 10 in the top row is exactly above 100 in the bottom row.

2: Work out how to use only one print statement.

Hints:

1: Finding out about System.out.printf and the % tags will help.

2: I would probably use the String#format method. If you can work out the % tags for printf, they work exactly the same way for String#format.

There is actually an advantage to using few print calls. Each print call takes a certain time, maybe a few milliseconds. That doesn't sound a lot, but if you are unlucky your 110 print instructions might take a half‑second or longer. Creating a String object probably takes a few microseconds or less. You can save time with a StringBuilder.

If you need a line end, try this, and don't use \n
private static final String LINE_END = System.getProperty("line.separator");
If that doesn't work I have got a spelling error in that
You can read about the % tags in the Java® Tutorials in two places: 1 2. One of them sorts out the line end problem.