IllegalFormatPrecisionException help
<p>I'm trying to write a program which prompts the user to enter two 3×3 matrices and displays their product.</p>

<p>For example, a user can enter:</p>

<pre>
Matrix A: 2 4 6 8 10 12 14 16 18
Matrix B: 1 2 3 4 5.6 6.6 7.4 8.1 9
</pre>

<p>Below is what I have tried, but I keep getting this error. Any help to point me in the right direction would be appreciated. I'm trying to get it to one decimal place:</p>

<pre>
Exception in thread "main" java.util.IllegalFormatPrecisionException: 2
    at java.util.Formatter$FormatSpecifier.checkInteger(Formatter.java:2892)
    at java.util.Formatter$FormatSpecifier.(Formatter.java:2643)
    at java.util.Formatter.parse(Formatter.java:2480)
    at java.util.Formatter.format(Formatter.java:2414)
    at java.io.PrintStream.format(PrintStream.java:920)
    at java.io.PrintStream.printf(PrintStream.java:821)
    at Exercise6_25.main(Exercise6_25.java:55)
</pre>

<hr>

<pre><code>import java.util.Scanner;

public class matrixCalc
{
    public static void main(String args[])
    {
        Scanner s= new Scanner(System.in);

        int i,j,k;
        int n=3;

        double a[][]= new double[n][n];
        double b[][]= new double[n][n];
        double c[][]= new double[n][n];

        System.out.println("enter the array elements of a:");

        for(i=0;i&lt;n;i++)
        {
            for(j=0;j&lt;n;j++)
            {
                a[i][j]=s.nextDouble();
            }
            System.out.print(" ");
        }

        System.out.println(" "); 
        System.out.println("enter the array elements of b:");

        for(i=0;i&lt;n;i++)
        {
            for(j=0;j&lt;n;j++)
            {
                b[i][j]=s.nextDouble();
            }
            System.out.print(" ");
        }

        System.out.println(" ");
        System.out.println("the result matrix is:");

        for(i=0;i&lt;n;i++)
        {
            for(j=0;j&lt;n;j++)
            {
                for(k=0;k&lt;n;k++)
                {
                    c[i][j]+=a[i][k]*b[k][j];
                }
            }
        }

        for(i=0;i&lt;n;i++)
        {
            for(j=0;j&lt;n;j++)
            {
                System.out.printf("%.2d", c[i][j]+" ");
            }
            System.out.println();
        }
    }
}
</code></pre>
