Added polymorphism.cpp

Classes and Inheritance/polymorphism.cpp

@@ -0,0 +1,47 @@
+#include <iostream>
+
+using namespace std;
+
+/*
+    Polymorphism. Uses existing functions to do different stuff.
+    Like a magpie, copies but this time changes very slightly.
+*/
+
+class Parent { // defining class Parent
+    public: // public access functions
+        void say() { // creating it's own say function
+            cout << "Parent!" << endl;
+        }
+};
+
+class Child : public Parent {
+    public:
+        void say() { // creating it's own say function
+            cout << "Child from Parent!" << endl;
+        }
+};
+
+class Childs_Child : public Child {
+    public:
+        void say() { // creating it's own say function
+            cout << "Child's Child from Child!" << endl;
+        }
+};
+
+int main() {
+    /*
+        Defining all objects per each class made above
+    */
+    Parent p;
+    Child c;
+    Childs_Child cc;
+    /*
+        Calling the say function from each class.
+        Note how it does not replace the function body.
+    */
+    p.say();
+    c.say();
+    cc.say();
+    // return 0
+    return 0;
+}