Function Overloading in C++ in c++

In C++ language, we can use create a more than one function with same name but each function must have different parameter list.

Such functions are called overloaded function and this process is known as function overloading.

Function overloading is an example of polymorphism.

Polymorphism means one function having many forms .

Example of function overloading:

#include <iostream>

using namespace std;

void show();
void show(int);
void show(char);

int main() {
    show();
    show(10);
    show('a');
}
void show() // overloaded function                                                 
{
    cout << "inside show"<<endl;
}
void show(int a) // overloaded function                  		         
{
    cout << "a = " << a<<endl;
}
void show(char c) // overloaded function                                                 
{
    cout << "character = " << c<<endl;
}

#include <iostream>

using namespace std;

void show();

void show(int);

void show(char);

int main() {

show();

show(10);

show('a');

}

void show() // overloaded function

{

cout << "inside show"<<endl;

}

void show(int a) // overloaded function

{

cout << "a = " << a<<endl;

}

void show(char c) // overloaded function

{

cout << "character = " << c<<endl;

}

Output

inside show
a = 10
character = a

inside show

a = 10

character = a

Description: In the above program, we have created a three function with same name “show” but each show() function have a different parameter list

Que. Write a C++ program to calculate the area of rectangle , triangle and circle using function overloading .

#include <iostream>

using namespace std;

void area(double);
void area(int, int);
void area(double, double);

int main() {
    area(5.5);
    area(10, 20);
    area(10.1, 11.2);
}

void area(double r) // overloaded function                                                 
{
    cout << "\n Area  of circle =" << (3.14 * r * r);
}

void area(int l, int b) // overloaded function                  		         
{
    cout << "\n Area of rectangle =" << (l * b);
}

void area(double b, double h) // overloaded function                                                 
{
    cout << "\n Area of triangle =" << ((0.5) * b * h);
}

#include <iostream>

using namespace std;

void area(double);

void area(int, int);

void area(double, double);

int main() {

area(5.5);

area(10, 20);

area(10.1, 11.2);

}

void area(double r) // overloaded function

{

cout << "\n Area of circle =" << (3.14 * r * r);

}

void area(int l, int b) // overloaded function

{

cout << "\n Area of rectangle =" << (l * b);

}

void area(double b, double h) // overloaded function

{

cout << "\n Area of triangle =" << ((0.5) * b * h);

}

Output

 Area  of circle =94.985
 Area of rectangle =200
 Area of triangle =56.56

Area of circle =94.985

Area of rectangle =200

Area of triangle =56.56

Function Overloading in Classes

#include <iostream>

using namespace std;

class example {
    public:

        void show() // overloaded function                                                 
    {
        cout << " Inside show";
    }
    void show(int a) // overloaded function                  		         
    {
        cout << "\n a=" << a;
    }
    void show(char c) // overloaded function                                                 
    {
        cout << "\n character =" << c;
    }
};

int main() {
    example obj;
    obj.show();
    obj.show(10);
    obj.show('z');
}

#include <iostream>

using namespace std;

class example {

public:

void show() // overloaded function

{

cout << " Inside show";

}

void show(int a) // overloaded function

{

cout << "\n a=" << a;

}

void show(char c) // overloaded function

{

cout << "\n character =" << c;

}

};

int main() {

example obj;

obj.show();

obj.show(10);

obj.show('z');

}

Output

Inside show
 a=10
 character =z

Inside show

a=10

character =z