Menu_of_Sorting.cpp

#include <iostream>
using namespace std;

void displayArray(int arr[], int n)
{
    for (int i = 0; i < n; i++)
    {
        cout << arr[i] << " ";
    }
    cout << endl;
}

void bubbleSort(int arr[], int n)
{
    for (int i = 0; i < n - 1; i++)
    {
        for (int j = 0; j < n - i - 1; j++)
        {
            if (arr[j] > arr[j + 1])
            {
                swap(arr[j], arr[j + 1]);
            }
        }
    }
}

void selectionSort(int arr[], int n)
{
    for (int i = 0; i < n - 1; i++)
    {
        int minIndex = i;

        for (int j = i + 1; j < n; j++)
        {
            if (arr[j] < arr[minIndex])
            {
                minIndex = j;
            }
        }

        swap(arr[i], arr[minIndex]);
    }
}

void insertionSort(int arr[], int n)
{
    for (int i = 1; i < n; i++)
    {
        int key = arr[i];
        int j = i - 1;

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

        arr[j + 1] = key;
    }
}

int partition(int arr[], int low, int high)
{
    int pivot = arr[high];
    int i = low - 1;

    for (int j = low; j < high; j++)
    {
        if (arr[j] < pivot)
        {
            i++;
            swap(arr[i], arr[j]);
        }
    }

    swap(arr[i + 1], arr[high]);

    return i + 1;
}

void quickSort(int arr[], int low, int high)
{
    if (low < high)
    {
        int pivotIndex = partition(arr, low, high);

        quickSort(arr, low, pivotIndex - 1);
        quickSort(arr, pivotIndex + 1, high);
    }
}

int main()
{
    int n;

    cout << "Enter the size of array: ";
    cin >> n;

    int arr[n];

    cout << "Enter " << n << " elements: ";
    for (int i = 0; i < n; i++)
    {
        cin >> arr[i];
    }

    int choice;

    cout << "\nOriginal Array: ";
    displayArray(arr, n);

    cout << "\n===== SORTING MENU =====" << endl;
    cout << "1. Bubble Sort" << endl;
    cout << "2. Selection Sort" << endl;
    cout << "3. Insertion Sort" << endl;
    cout << "4. Quick Sort" << endl;
    cout << "Enter your choice: ";
    cin >> choice;

    switch (choice)
    {
        case 1:
            bubbleSort(arr, n);
            cout << "\nArray after Bubble Sort: ";
            displayArray(arr, n);
            break;

        case 2:
            selectionSort(arr, n);
            cout << "\nArray after Selection Sort: ";
            displayArray(arr, n);
            break;

        case 3:
            insertionSort(arr, n);
            cout << "\nArray after Insertion Sort: ";
            displayArray(arr, n);
            break;

        case 4:
            quickSort(arr, 0, n - 1);
            cout << "\nArray after Quick Sort: ";
            displayArray(arr, n);
            break;

        default:
            cout << "\nInvalid choice!" << endl;
    }

    return 0;
}