Fix some errors in Inheritance.md (ronreiter#691)

Fix imaginary part of the `c1` in the expected output. 
Add detail to the solution.

Author: twsearle

tutorials/learn-cpp.org/en/Inheritance.md

@@ -68,6 +68,7 @@ Tutorial Code
     int main()
     {
         Complex c1(15, 15), c2 (100, 100);
+        cout << endl;
         return 0;
     }
 
@@ -76,11 +77,10 @@ Expected Output
 
     Forming...x (real): 15 15 y (imag): 30 30
     Forming...x (real): 100 100 y (imag): 200 200
-    
     c1: (Point) x:100 y:200
     c2: x:15 y:30
 
-    c1: x (real): 100 100 y (imag): 200 100
+    c1: x (real): 100 100 y (imag): 200 200
     c2: x (real): 15 15 y (imag): 30 30
 
 Solution
@@ -94,22 +94,54 @@ Solution
     std::ostream& operator<<(std::ostream& out, const Point& c);
 
     class Complex;
+    
+    template<typename T>
+    void Swap(T &a, T &b) { T temp = a; a = b; b = temp; }
+
+    class Point {
+    public:
+        int x, y;
+
+        Point (int c1, int c2) { x = c1; y = c2;}
+        Point& operator=(Point rhs) {
+            x = rhs.x; y = rhs.y;
+            return *this;
+        }
+    };
+    
+    class Complex : public Point {
+    private: 
+    int &real, &imag;
+    public: 
+        Complex(int r, int i) : Point (r, i), real (x), imag (y) 
+        { cout << "Forming..." << *this; }
+        friend std::ostream& operator<<(std::ostream& out, const Complex& c);
+    };
+    
     std::ostream& operator<<(std::ostream& out, const Complex& c)
     {
-      // write obj to stream    
-    
+        // write obj to stream    
+        out << "x (real): " << c.x << " " << c.real
+            << " y (imag): " << c.y << " " << c.imag << endl;
     }
 
     int main()
     {
         Complex c1(15, 30), c2 (100, 200);
         Point& p_c1 = c1; Point& p_c2 = c2;
+        cout << endl;
         
         Swap (p_c1, p_c2);  // swapping Complex objects as Point objects
         
-        cout << "c1: (Point)" << p_c1 << "c2: " << p_c2 << endl;	    
+        cout << "c1: (Point) " << p_c1 << "c2: " << p_c2 << endl;	    
         cout << "c1: " << c1 << "c2: " << c2 << endl;
         
         return 0;
     }
-    
+    
+    std::ostream& operator<<(std::ostream& out, const Point& c)
+    {
+        out<< "x:" << c.x << " ";
+        out<< "y:" << c.y << "\n";
+        return out;
+    }