Example: Selection Sort in Descending Order in C

// Selection Sort in Descending Order
#include <stdio.h>

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

// Function to perform selection sort in descending order
void selectionSortDescending(int arr[], int n) {
    int i, j, max_idx;

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

        // Swap the found maximum element with the first element of the unsorted subarray
        swap(&arr[max_idx], &arr[i]);
    }
}

// Function to print an array
void printArray(int arr[], int size) {
    int i;
    for (i = 0; i < size; i++) {
        printf("%d ", arr[i]);
    }
    printf("\n");
}

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

    // Step 2: Print the original array
    printf("Original array: ");
    printArray(arr, n);

    // Step 3: Call selection sort function to sort in descending order
    selectionSortDescending(arr, n);

    // Step 4: Print the sorted array
    printf("Sorted array (descending): ");
    printArray(arr, n);

    return 0;
}