adding a multiple level inheritance example

lectures/26_inheritance/multiple_level_inheritance.cpp

@@ -0,0 +1,38 @@
+#include <iostream>
+
+// multiple-level inheritance
+
+class A
+{
+public:
+	A(int a):a(a){}
+	int a;
+};
+class B:public A
+{
+public:
+	B(int a, int b):b(b),A(a){}
+	int b;
+};
+class C:public B
+{
+public:
+	C(int a, int b, int c):B(a, b),c(c){}
+	int c;
+
+};
+class D:public C
+{
+public:
+	D(int a, int b, int c, int d):C(a,b,c),d(d){}
+	void print(){
+		std::cout << a << ":" << b << ":" << c << ":" << d << std::endl;
+	}
+	int d;
+};
+
+int main(){
+	D dObject(1,2,3,4);
+	dObject.print();
+	return 0;
+}