Example: Selection Sort using Function in C++

// Selection Sort using Function
#include <iostream> // For input/output operations
#include <algorithm> // For std::swap

// Function to swap two elements
void swap(int* xp, int* yp) {
    int temp = *xp;
    *xp = *yp;
    *yp = temp;
}

// Function to print an array
void printArray(int arr[], int size) {
    for (int i = 0; i < size; i++) {
        std::cout << arr[i] << " ";
    }
    std::cout << std::endl;
}

// Function to perform Selection Sort on an array
void selectionSort(int arr[], int n) {
    int i, j, min_idx;

    // One by one move boundary of unsorted subarray
    for (i = 0; i < n - 1; i++) {
        // Find the minimum element in unsorted array
        min_idx = i;
        for (j = i + 1; j < n; j++) {
            if (arr[j] < arr[min_idx]) {
                min_idx = j;
            }
        }

        // Swap the found minimum element with the first element of the unsorted part
        // std::swap(arr[min_idx], arr[i]); // Can use std::swap from <algorithm>
        swap(&arr[min_idx], &arr[i]); // Using custom swap function
    }
}

int main() {
    // Step 1: Initialize an unsorted array
    int arr[] = {64, 25, 12, 22, 11};
    int n = sizeof(arr) / sizeof(arr[0]);

    std::cout << "Original array: ";
    printArray(arr, n);

    // Step 2: Call the selectionSort function to sort the array
    selectionSort(arr, n);

    std::cout << "Sorted array: ";
    // Step 3: Print the sorted array
    printArray(arr, n);

    return 0;
}