adding name hiding example

lectures/25_inheritance/name_hiding.cpp

@@ -0,0 +1,22 @@
+#include <iostream>
+
+class A {
+public:
+    void func(int x) {
+        std::cout << "A::func(int): " <<  x << "\n";
+    }
+};
+
+class B : public A {
+public:
+    void func(double y) {
+        std::cout << "B::func(double): " << y << "\n";
+    }
+};
+
+int main() {
+    B b;
+    b.func(10);    // Calls B::func(double)
+    b.func(10.5);  // Calls B::func(double)
+    return 0;
+}