Comments T9

T9Q1_1/main.cpp

@@ -11,6 +11,17 @@ public:
     }
     virtual void print();
     friend int doubleIt(A a);
+
+    // Question 1.B
+    // Option 1: Member method
+    A operator+(A z) {
+        const int new_a = a + z.a;
+        const int new_b = b + z.b;
+        return {new_a, new_b};
+    }
+    // Option 2: Non-member method
+    friend A operator+(const A& z, const A& y);
+    // Question 1.B
 };
 
 class B : public A {
@@ -37,8 +48,18 @@ void B::input(float x, float y) {
 
 int doubleIt(A a) { return a.a * a.a; }
 
+// Question 1.B
+// Option 2: Non-member method
+A operator+(const A& z, const A& y) {
+    const int new_a = z.a + y.a;
+    const int new_b = z.b + y.b;
+    return {new_a, new_b};
+}
+// Question 1.B
+
+
 int main() {
-    A a1(10, 20), *ptr;
+    A a1(10, 20), *ptr; // Try put *ptr in a new line, as "B *ptr;" to see what is happening;
     B b1;
     b1.input(7.5, 3.142);
 

T9Q2/main.cpp

@@ -3,7 +3,10 @@ using namespace std;
 
 class BC {
 public:
+    // Inheritance in C++ is not similar to Java. The method above will not be automatically overrride
     void show(void) { cout << " \n I am in base class.."; }
+    // Unless we add the keyword virtual on it. Comment the line above and uncomment the line below to test.
+//    virtual void show(void) { cout << " \n I am in base class.."; }
 };
 class DC : public BC {
 public: