Adding zero to a single digit number, Is it possible?

Question

public class MultiplicationTable {
public static void main (String[]a){

    int[] x;
    x = new int[10];
    int i;
    int n=0;

    for (i=0;i

        

Answer 1

Yes you can! You can use String.format to add zero padding to your output.

Example:

String.format("%05d", 2) would produce 00002.

Some improvement on the current code:

I'm not sure why you intend to store the numbers inside an array (for practice purpose maybe), but that is not necessary as it goes from 1 to 10 anyway. Though if you want to do that, you don't need both i and n.

for (i=0; i<x.length; i++){
    x[i] = i+1;
    System.out.print(x[i] + " ");
}

Secondly, I'm sure you realize that you have a lot of duplicate code, and it's quite sequential. You can do that using 2 nested for loops, instead of having 10 single loops:

for (int row = 1; row <= 10; row++) {
    for (int col = 1; col <= 10; col++)
        System.out.print(String.format("%03d", row * col));
    System.out.println();
}

Answer 2

Yes:

String.format("%01d", x[i]*x[j]); is what you want.

If you're familiar with printf in C then this will be familiar. If not, read the java reference on String.format format strings.

Also, rather than 10 System.out.println statements, you can use a doubly nested loop with two counters. One to count which row you're in j and one for each column i.