quick_sort.cpp Adds QuickSort Algorithm

Corrected erros from 1st commit.

Closes #250

README.md

@@ -2,7 +2,7 @@
 
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+[![Build Status](https://travis-ci.com/NITSkmOS/Algorithms.svg?branch=master)](https://travis-ci.com/NITSkmOS/Algorithms)
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bubble_sort/Cpp/bubble_sort.cpp

@@ -1,4 +1,5 @@
-#include <stdio.h>
+#include <iostream>
+using namespace std;
 
 void swap(int *xp, int *yp) {
 	int temp = *xp;
@@ -17,8 +18,6 @@ void bubble_sort(int arr[], int n) {
 				swapped = true;
 			}
 		}
-
-		// If no two elements were swapped by inner loop, then break
 		if (swapped == false)
 			break;
 	}
@@ -28,17 +27,16 @@ void bubble_sort(int arr[], int n) {
 void print_array(int arr[], int size) {
 	int i;
 	for (i = 0; i < size; i++)
-		printf("%d ", arr[i]);
-
-	printf("\n");
+		cout << arr[i] << " ";
+	cout << endl;
 }
 
 // Driver program to test above functions
 int main() {
 	int arr[] = {64, 34, 25, 12, 22, 11, 90};
 	int n = sizeof(arr) / sizeof(arr[0]);
 	bubble_sort(arr, n);
-	printf("Sorted array: \n");
+	cout << "Sorted array: " << endl;
 	print_array(arr, n);
 	return 0;
 }

quicksort/Cpp/quick_sort.cpp

@@ -1,42 +1,39 @@
-
 #include <iostream>
 
 using std::cout;
 
 void quick_sort(int a[], int left, int right) {
+    int i = left, j = right;
+    int pivot = a[right];
 
-      int i = left, j = right;
-      int pivot = a[right];
-
-      while (i <= j) {
+    while (i <= j) {
         while (a[i] < pivot)
             i++; //carry on, this part already sorted
         while (a[j] > pivot)
             j--; //carry on, this part already sorted
         if (i <= j) { // a[i]>=pivot and a[j]<=pivot
-            //swap a[i] with a[j]
+        //swap a[i] with a[j]
             int tmp = a[i];
             a[i] = a[j];
             a[j] = tmp;
             i++;
             j--;
         }
-      };
+    }
 
-      if (left < j)
+    if (left < j)
         quick_sort(a, left, j);
-      if (i < right)
+    if (i < right)
         quick_sort(a, i, right);
-
 }
 
-int main(void){
+int main(void) {
     int a[10] = { 10, 7, 9, 4, 6, 2, 5, 6, 84, 12};
     int a_size = sizeof(a)/sizeof(a[0]);
 
     quick_sort(a, 0, a_size-1);
 
-    for(int i=0; i<a_size; i++){
+    for (int i = 0; i < a_size; i++) {
         cout << a[i] << " ";
     }
-}
+}