C implementation QuickSort

/* C implementation QuickSort */ #include<stdio.h>    // A utility function to swap two elements void swap(int* a, int* b) {     int t = *a;     *a = *b;     *b = t; }    /* This function takes last element as pivot, places    the pivot element at its correct position in sorted     array, and places all smaller (smaller than pivot)    to left of pivot and all greater elements to right    of pivot */ int partition (int arr[], int low, int high) {     int pivot = arr[high];    // pivot     int i = (low - 1);  // Index of smaller element        for (int j = low; j <= high- 1; j++)     {         // If current element is smaller than or         // equal to pivot         if (arr[j] <= pivot)         {             i++;    // increment index of smaller element             swap(&arr[i], &arr[j]);         }     }     swap(&arr[i + 1], &arr[high]);     return (i + 1); }    /* The main function that implements QuickSort  arr[] --> Array to be sorted,   low  --> Starting index,   high  --> Ending index */ void quickSort(int arr[], int low, int high) {     if (low < high)     {         /* pi is partitioning index, arr[p] is now            at right place */         int pi = partition(arr, low, high);            // Separately sort elements before         // partition and after partition         quickSort(arr, low, pi - 1);         quickSort(arr, pi + 1, high);     } }    /* 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"); }    // Driver program to test above functions int main() {     int arr[] = {10, 7, 8, 9, 1, 5};     int n = sizeof(arr)/sizeof(arr[0]);     quickSort(arr, 0, n-1);     printf("Sorted array: n");     printArray(arr, n);     return 0; }

Output:

Sorted array:
1 5 7 8 9 10