implement quicksort in c again to practice and in oding to see what its like

c/quicksort.c

@@ -0,0 +1,51 @@
+#include <stdio.h>
+
+// the partition will weakly sort the array and return the index of
+// the pivot
+int partition(int arr[], int lo, int hi) {
+    int pivot_value = arr[hi];
+    int current_index = lo - 1;
+    int temp;
+    for (int i = lo; i < hi; i++) {
+        if (arr[i] <= pivot_value) {
+            current_index++;
+
+            temp = arr[i];
+            arr[i] = arr[current_index];
+            arr[current_index] = temp;
+        }
+    }
+
+    // once done with loop the current_index will hold
+    // the location where we need to place the pivot_value
+    current_index++;
+    arr[hi] = arr[current_index];
+    arr[current_index] = pivot_value;
+
+    return (current_index);
+}
+
+void qs(int arr[], int lo, int hi) {
+    if (lo < hi) {
+        int current_pivot = partition(arr, lo, hi);
+        qs(arr, lo, current_pivot - 1);
+        qs(arr, current_pivot + 1, hi);
+    }
+}
+
+void print_array(int arr[], int len) {
+    printf("[ ");
+    for (int i = 0; i < len; i++) {
+        printf("%d ", arr[i]);
+    }
+    printf("]\n");
+}
+
+int main() {
+    int arr[5] = {0, 2, 5, 1, 6};
+    print_array(arr, 5);
+    qs(arr, 0, 4);
+    print_array(arr, 5);
+
+    return (0);
+}