void area(int a);
void area(int a, int b); 

// CPP program to illustrate
// Function Overloading
#include <iostream>
using namespace std;
 
// overloaded functions
void test(int);
void test(float);
void test(int, float);
 
int main()
{
    int a = 5;
    float b = 5.5;
 
    // Overloaded functions
    // with different type and
    // number of parameters
    test(a);
    test(b);
    test(a, b);
 
    return 0;
}
 
// Method 1
void test(int var)
{
    cout << "Integer number: " << var << endl;
}
 
// Method 2
void test(float var)
{
    cout << "Float number: "<< var << endl;
}
 
// Method 3
void test(int var1, float var2)
{
    cout << "Integer number: " << var1;
    cout << " and float number:" << var2;
}

Integer number: 5
Float number: 5.5
Integer number: 5 and float number: 5.5

Class a
{
public: 
      virtual void display(){ cout << "hello"; }
};

Class b:public a
{
public: 
       void display(){ cout << "bye";}
};

// CPP program to illustrate
// Function Overriding
#include<iostream>
using namespace std;
 
class BaseClass
{
public:
    virtual void Display()
    {
        cout << "\nThis is Display() method"
                " of BaseClass";
    }
    void Show()
    {
        cout << "\nThis is Show() method "
               "of BaseClass";
    }
};
 
class DerivedClass : public BaseClass
{
public:
    // Overriding method - new working of
    // base class's display method
    void Display()
    {
        cout << "\nThis is Display() method"
               " of DerivedClass";
    }
};
 
// Driver code
int main()
{
    DerivedClass dr;
    BaseClass &bs = dr;
    bs.Display();
    dr.Show();
}

This is Display() method of DerivedClass
This is Show() method of BaseClass