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site hosting import java.util.*;class RandomTest { public static void main (String args[]) { int[] ndigits = new int[10]; double x; int n; Random myRandom = new Random(); // Initialize the array for (int i = 0; i < 10; i++) { ndigits[i] = 0; } // Test the random number generator a whole lot for (long i=0; i < 100000; i++) { // generate a new random number between 0 and 9 x = myRandom.nextDouble() * 10.0; n = (int) x; //count the digits in the random number ndigits[n]++; } // Print the results for (int i = 0; i <= 9; i++) { System.

site hosting out.println(i+": " + ndigits[i]); } } } We've got three for loops in this code, one to initialize the array, one to perform the desired calculation, and a final one to print out the results. This is quite common in code that uses arrays.Two Dimensional Arrays The most common kind of multidimensional array is a two-dimensional array. If you think of a one-dimensional array as a column of values you can think of a two-dimensional array as a table of values like so: c0 c1 c2 c3 r0 0 1 2 3 r1 1 2 3 4 r2 2 3 4 5 r3 3 4 5 6 r4 4 5 6 7 Here we have an array with five rows and four columns.

site hosting It has twenty total elements. However we say it has dimension four by five, not dimension twenty. This array is not the same as a five by four array like this one: c0 c1 c2 c3 c4 r0 0 1 2 3 4 r1 1 2 3 4 5 r2 2 3 4 5 6 r3 3 4 5 6 7 We need to use two numbers to identify a position in a two-dimensional array. These are the element's row and column positions. For instance if the above array is called J then J[0][0] is 0, J[0][1] is 1, J[0][2] is 2, J[0][3] is 3, J[1][0] is 1, and so on.

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