feat : added Bitonic Sort Algorithm in C fixes #1420

sorting/bitonic_sort.c

@@ -0,0 +1,122 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <time.h>
+#include <assert.h>
+#include <stdbool.h>
+
+#define N 32  // Defining the array size for testing
+
+// Function to print the array
+void display(int arr[], int n) {
+    for (int i = 0; i < n; i++) {
+        printf("%d ", arr[i]);
+    }
+    printf("\n");
+}
+
+// Function to swap two elements
+void swap(int *a, int *b) {
+    int temp = *a;
+    *a = *b;
+    *b = temp;
+}
+
+// Function to perform a bitonic merge
+void bitonicMerge(int arr[], int low, int cnt, int dir) {
+    if (cnt > 1) {
+        int k = cnt / 2;
+        for (int i = low; i < low + k; i++) {
+            if (dir == (arr[i] > arr[i + k])) {
+                swap(&arr[i], &arr[i + k]);
+            }
+        }
+        bitonicMerge(arr, low, k, dir);
+        bitonicMerge(arr, low + k, k, dir);
+    }
+}
+
+// Function to recursively sort a bitonic sequence
+void bitonicSort(int arr[], int low, int cnt, int dir) {
+    if (cnt > 1) {
+        int k = cnt / 2;
+        bitonicSort(arr, low, k, 1);      // Sort in ascending order
+        bitonicSort(arr, low + k, k, 0);  // Sort in descending order
+        bitonicMerge(arr, low, cnt, dir); // Merge the entire sequence
+    }
+}
+
+// Main function to sort the array using Bitonic Sort
+void bitonicSortArray(int arr[], int n, int ascending) {
+    bitonicSort(arr, 0, n, ascending);
+}
+
+// Function to check if an array is sorted
+bool is_sorted(int arr[], int n) {
+    for (int i = 1; i < n; i++) {
+        if (arr[i - 1] > arr[i]) {
+            return false;
+        }
+    }
+    return true;
+}
+
+// Self-test function for Bitonic Sort
+void test_bitonicSort() {
+    int test1[] = {10, 11, 9, 8, 4, 7, 3, 8};
+    int expected1[] = {3, 4, 7, 8, 8, 9, 10, 11};
+    bitonicSortArray(test1, 8, 1);
+    for (int i = 0; i < 8; i++) {
+        assert(test1[i] == expected1[i]);
+    }
+
+    int test2[] = {50, 40, 30, 20, 10, 0};
+    int expected2[] = {0, 10, 20, 30, 40, 50};
+    bitonicSortArray(test2, 6, 1);
+    for (int i = 0; i < 6; i++) {
+        assert(test2[i] == expected2[i]);
+    }
+
+    int test3[] = {3, 3, 3, 3, 3, 3};
+    int expected3[] = {3, 3, 3, 3, 3, 3};
+    bitonicSortArray(test3, 6, 1);
+    for (int i = 0; i < 6; i++) {
+        assert(test3[i] == expected3[i]);
+    }
+
+    // Check random array generation and sorting
+    int random_test[N];
+    srand(time(0));
+    for (int i = 0; i < N; i++) {
+        random_test[i] = rand() % (N << 1);
+    }
+    bitonicSortArray(random_test, N, 1);
+    assert(is_sorted(random_test, N));
+
+    printf("All test cases passed successfully!\n");
+}
+
+// Main function to initialize array and call Bitonic Sort
+int main() {
+    // Self-test the implementation
+    test_bitonicSort();
+
+    // Manual testing with randomly generated array
+    int arr[N];
+
+    // Generate random numbers for the array
+    srand(time(0)); // Seed for random number generation
+    for (int i = 0; i < N; i++)
+        arr[i] = rand() % (N << 1); /* Random numbers from 0 to 2N */
+
+    printf("Original array: ");
+    display(arr, N);
+
+    // Call the Bitonic Sort function
+    bitonicSortArray(arr, N, 1);
+
+    printf("Sorted array: ");
+    display(arr, N);
+
+    return 0;
+}
+