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Thread: HELP ME PLEASE, i cant figure it out whats the problem of Bubble & Selection sor :(

  1. #1
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    Unhappy HELP ME PLEASE, i cant figure it out whats the problem of Bubble & Selection sor :(

    import java.util.*;

    public class MidtermNina
    {
    public static void main(String[] args)
    {
    Scanner console = new Scanner(System.in);
    Scanner call = new Scanner(System.in);

    System.out.println("INPUT 5 RANDOM INTEGERS: ");

    int[] arr = new int[5];
    for(int i=0; i<arr.length; i++)
    {
    arr[i] = console.nextInt();
    }

    System.out.println("SELECT SORTING METHOD: 1. BUBBLE SORT, 2.SELECTION SORT, 3.INSERTION SORT");
    int sortChoice = call.nextInt();

    switch(sortChoice)
    {
    case 1:
    bubbleSorts(arr);
    break;
    case 2:
    selectionSorts(arr);
    break;
    case 3:
    insertionSorts(arr);
    break;
    default:
    System.out.print("NUMBER IS NOT IN THE CHOICES! ");
    break;

    }

    }
    public static void printArray(int[] arr)
    {
    for(int z=0; z<arr.length;z++)
    {
    System.out.print(" ");
    System.out.print(arr[z]);
    }
    System.out.println();

    }

    public static void bubbleSorts(int[] arr)
    {
    int count=0;
    int count1=0;
    int count2=0;

    for(int i=1; i<arr.length-1; i++)
    {
    count++;
    for(int j=0;j<arr.length-1;j++)
    {
    count1++;

    if(arr[j] > arr[j+1])
    {
    count2++;
    int temp = arr[j];
    arr[j] = arr[j+1];
    arr[j+1] = temp;
    }
    }
    System.out.print("BUBBLE SORTING"+i+":");
    printArray(arr);
    }
    System.out.println("");
    System.out.println("Number of Reset:"+count);
    System.out.println("Comparison: "+count1);
    System.out.println("Swap: "+count2);

    System.out.print("Bubble Sorted Integers: ");

    for(int i=0; i<arr.length; i++)
    {
    System.out.print(" "+arr[i]);
    }
    System.out.println();
    }

    public static void selectionSorts(int[] arr)
    {
    int reset =0;
    int counts =0;
    int swap =0;

    for(int i=0; i<arr.length-1;i++)
    {
    reset--;

    int index=i;

    for(int j=i+1;j<5;j++)
    {
    counts++;

    if(arr[j] < arr[index])
    {
    swap++;

    index = j;
    }

    }
    int temp = arr[index];
    arr[index] = arr[i];
    arr[i] = temp;

    System.out.print("Doing Sorting Pass: "+i+": ");
    printArray(arr);
    }

    System.out.println();
    System.out.println("Number of Reset: "+reset);
    System.out.println("Number Comparison: "+counts);
    System.out.println("Number Swap: "+swap);

    System.out.print("Selection Sorting: ");

    for(int i=0;i<arr.length; i++)
    {
    System.out.print(" "+arr[i]);
    }
    System.out.println();

    }


    public static void insertionSorts(int[] arr)
    {
    int reset=0;
    int count=0;
    int swap=0;

    for(int i=1;i<arr.length;i++)
    {
    reset--;
    int temp = arr[i];
    int j= i-1;

    while(j>=0 && arr[j] > temp)
    {
    count++;
    arr[j+1] = arr[j];
    j = j-1;
    }
    arr[j+1] = temp;
    swap++;

    System.out.print("INSERTION SORTING: "+i+": ");
    printArray(arr);
    }
    System.out.println();
    System.out.println("Number of Reset: "+reset);
    System.out.println("Comparison : "+count);
    System.out.println("Swap: "+swap);

    System.out.print("Insertion Sorting: ");

    for(int i = 0; i<arr.length; i++)
    {
    System.out.print(" "+ arr[i]);
    }
    System.out.println();

    }
    }

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: HELP ME PLEASE, i cant figure it out whats the problem of Bubble & Selection sor :(

    Can you copy the program's output and paste it here so we can see what it is doing?
    Add some comments to show what is wrong.

    Also add some comments to the code describing what it is trying to do and how it is going to do it.

    Please edit your post and wrap your code with code tags:

    [code]
    **YOUR CODE GOES HERE**
    [/code]

    to get highlighting and preserve formatting.
    If you don't understand my answer, don't ignore it, ask a question.

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