array tally

/*
 * count how many numbers in the array are between 1 - 10, 11 - 20, etc.
 * kind-of like making a histogram
 */
public static void tally(int[] array) {
    int i;
    int[] tally = new int[10]; //table to hold range counts

    /*
     * the for loop iterates over the entire array, testing every element for its range
     * the value of the element is subtracted by 1, and then integer-divided by 10
     * (remember, integer division floors)
     * this obtains the index of the total table to increment
     * total 1-10 is index 0, 11-20 is index 1, etc.
     * ---
     * some example math problems (remember, integer division)
     * (10 - 1) / 10 = 0
     * (22 - 1) / 10 = 2
     * ---
     * and kids say they'll never use math :)
     */
    for(i = 0; i < array.length; i++) {
        tally[(array[i] - 1) / 10]++;
    }

    /*
     * iterate over the total table and print the values
     * range numbers are calculated based on i
     */
    for(i = 0; i < 10; i++) {
        System.out.printf("%3d - %3d: %3d\n", (i * 10) + 1, (i + 1) * 10, tally[i]);
    }
}