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Re: Help with java insertion sort program

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On 08/09/2014 10:28 PM, Jeff Higgins wrote:
> On 08/09/2014 10:11 PM, Scott Dunning wrote:
>> Hello I trying write a sorting program that will ask a user what type of
>> sorting method to use (insertion, bubble, selection) and then ask them
>> to enter integers to sort.
>
> I guessing that since you are asking for help here that working
> the problem out from first principles on your own is not a requirement.
>
> I'll suggest then that Google is your friend.
> Algorithms 4th ed. Sedgewick Wayne
> 2.1   Elementary Sorts
> <http://algs4.cs.princeton.edu/21elementary/>

Oops. Skip that since you've already done that homework.
Instead, Google java.io.Console.

Change public void printArray(int[] input) {
to public static void printArray(int[] input) {

and try:

public class DriverSort {
   public static void main(String[] args) {
     int input[] = new int[] { 5, 7, 6, 3, 1 };
     Sorter.insertionSort(input);
     Sorter.printArray(input);
   }
}

>> I thought I had everything correct but apparantly not.  Haha.  This is
>> the output and I am not sure where I am going wrong.
>>
>> Before Sorting:
>> [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
>>
>> After Sorting:
>> [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
>> [0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
>>
>>
>> Do I seem to be putting things in the correct spot?
>>
>> Thanks for any help!!
>>
>> DriverSort class...
>>
>>      import java.util.Scanner;
>>
>>      public class DriverSort {
>>
>>      public static void main(String[] args) {
>>
>>          Scanner scan =new Scanner(System.in);
>>          Sorter sorter = new Sorter();
>>
>>          int choice;  // variable which says which sorting algorithm
>> to use
>>
>>          System.out.println("1-Insertion sort\n"
>>                          +"2-Selection sort\n"
>>                          + "3-Bubble sort\n"
>>                          + "0-quit\n");
>>          choice = scan.nextInt();
>>
>>          System.out.println("Please enter the number for a sorting
>> method or enter 0 to quit: ");
>>          int size = scan.nextInt();
>>          int input[] = new int[size];
>>
>>
>>          System.out.println("\nBefore Sorting: ");
>>          sorter.printArray(input);
>>              // sort the array
>>              Sorter.insertionSort(input);
>>              System.out.println("\nAfter Sorting: ");
>>              sorter.printArray(input);
>>
>>          switch (choice) {
>>
>>          case 0:
>>              System.out.println("Goodbye!");
>>              System.exit(0);
>>              break;
>>
>>          case 1: Sorter.insertionSort(input);
>>              sorter.printArray(input);
>>              break;
>>
>>          }
>>        }
>>     }
>>
>> Sorter class....
>>
>>
>>      public class Sorter {
>>
>>      public static int[] insertionSort(int[] input) {
>>
>>          for (int i = 1; i < input.length; i++) {
>>              int valueToSort = input[i];
>>              int j = i;
>>              while (j > 0 && input[j - 1] > valueToSort) {
>>                  input[j] = input[j - 1];
>>                  j--;
>>              }//end while loop.
>>              // insert the element
>>              input[j] = valueToSort;
>>          }//end for loop
>>              return input;
>>      }//end insertionSort
>>
>>
>>          public void printArray(int[] input) {
>>              System.out.println(Arrays.toString(input));
>>
>>          }
>>      }
>>
>>
>>
>

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Help with java insertion sort program Scott Dunning <scottwd01@gmail.com> - 2014-08-09 19:11 -0700
  Re: Help with java insertion sort program Jeff Higgins <jeff@invalid.invalid> - 2014-08-09 22:28 -0400
    Re: Help with java insertion sort program Jeff Higgins <jeff@invalid.invalid> - 2014-08-09 23:34 -0400
      Re: Help with java insertion sort program Scott Dunning <scottwd01@gmail.com> - 2014-08-09 21:11 -0700
        Re: Help with java insertion sort program Jeff Higgins <jeff@invalid.invalid> - 2014-08-10 00:30 -0400
          Re: Help with java insertion sort program Jeff Higgins <jeff@invalid.invalid> - 2014-08-10 00:45 -0400
            Re: Help with java insertion sort program Jeff Higgins <jeff@invalid.invalid> - 2014-08-10 05:58 -0400
          Re: Help with java insertion sort program Jeff Higgins <jeff@invalid.invalid> - 2014-08-10 05:54 -0400
  Re: Help with java insertion sort program Mike Amling <mamling@chaff.us> - 2014-08-10 06:09 -0500
    Re: Help with java insertion sort program Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-08-10 07:43 -0400
      Re: Help with java insertion sort program Mike Amling <mamling@chaff.us> - 2014-08-13 23:51 -0500
        Re: Help with java insertion sort program Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-08-14 08:07 -0400
      Re: Help with java insertion sort program Mike Amling <mamling@chaff.us> - 2014-08-14 00:46 -0500
    Re: Help with java insertion sort program Arne Vajhøj <arne@vajhoej.dk> - 2014-08-19 16:50 -0400
  Re: Help with java insertion sort program Roedy Green <see_website@mindprod.com.invalid> - 2014-08-12 03:00 -0700
    Re: Help with java insertion sort program Mike Amling <mamling@chaff.us> - 2014-08-13 23:51 -0500
      Re: Help with java insertion sort program Jukka Lahtinen <jtfjdehf@hotmail.com.invalid> - 2014-08-14 14:30 +0300

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