Added template and test cases

sorting/heap_sort.cpp

@@ -23,6 +23,8 @@
  *
  */
 #include <iostream>
+#include <algorithm>
+#include <cassert>
 
 /**
  *
@@ -33,7 +35,8 @@
  * @param sz size of array
  *
  */
-void printArray(int *arr, int sz) {
+template <typename T>
+void printArray(T *arr, int sz) {
     for (int i = 0; i < sz; i++) std::cout << arr[i] << "  ";
     std::cout << "\n";
 }
@@ -50,7 +53,8 @@ void printArray(int *arr, int sz) {
  *          Array to be compared with it's childern
  *
  */
-void heapify(int *arr, int n, int i) {
+template <typename T>
+void heapify(T *arr, int n, int i) {
     int largest = i;
     int l = 2 * i + 1;
     int r = 2 * i + 2;
@@ -75,7 +79,8 @@ void heapify(int *arr, int n, int i) {
  * @param n size of array
  *
  */
-void heapSort(int *arr, int n) {
+template <typename T>
+void heapSort(T *arr, int n) {
     for (int i = n - 1; i >= 0; i--) heapify(arr, n, i);
 
     for (int i = n - 1; i >= 0; i--) {
@@ -84,13 +89,27 @@ void heapSort(int *arr, int n) {
     }
 }
 
-/** Main function */
-int main() {
+void test() {
+    std::cout << "Test 1\n";
     int arr[] = {-10, 78, -1, -6, 7, 4, 94, 5, 99, 0};
     int sz = sizeof(arr) / sizeof(arr[0]);  // sz - size of array
     printArray(arr, sz);  // displaying the array before sorting
     heapSort(arr, sz);    // calling heapsort to sort the array
     printArray(arr, sz);  // display array after sorting
-    return 0;
+    assert(std::is_sorted(arr, arr+sz));
+    std::cout << "Test 1 Passed\n========================\n";
+    std::cout << "Test 2\n";
+    double arr2[] = {4.5, -3.6, 7.6, 0, 12.9};
+    sz = sizeof(arr2) / sizeof(arr2[0]);
+    printArray(arr2, sz);
+    heapSort(arr2, sz);
+    printArray(arr2, sz);
+    assert(std::is_sorted(arr2, arr2+sz));
+    std::cout << "Test 2 passed\n";
+}
+/** Main function */
+int main() {
+  test();
+  return 0;
 }
 /** @} */