Algorithm
** Overloading Increment (++) Operator:
1. Define a Class:
i. Create a class for which you want to overload the ++ operator.
2. Declare Overloaded Operator in the Class:
i. Inside the class declaration, declare the ++ operator function. The declaration might look like:
'ReturnType operator++()';
3. Define Overloaded Operator Outside the Class:
i. Outside the class, define the overloaded ++ operator. This is where you specify the behavior of the operator. The function signature should be similar to: ReturnType ClassName::operator++() { /* Implementation */ }
4. Implement Increment Operation:
i. Inside the definition, write the code for the increment operation. Usually, this involves modifying the state of the object.
5. Return Result:
Ensure the function returns the modified object or a new object as needed.
** Overloading Decrement (--) Operator:
1. Define a Class:
Create a class for which you want to overload the -- operator.
2. Declare Overloaded Operator in the Class:
Inside the class declaration, declare the -- operator function. The declaration might look like: ReturnType operator--();
3. Define Overloaded Operator Outside the Class:
Outside the class, define the overloaded -- operator. This is where you specify the behavior of the operator. The function signature should be similar to: ReturnType ClassName::operator--() { /* Implementation */ }
4. Implement Decrement Operation:
Inside the definition, write the code for the decrement operation. Usually, this involves modifying the state of the object.
5. Return Result:
Ensure the function returns the modified object or a new object as needed.
Remember to handle pre-increment, post-increment, pre-decrement, and post-decrement variations as per your requirements.
Code Examples
#1 Code Example- C++ Programing Prefix ++ Increment Operator Overloading with no return type
Code -
C++ Programming
#include <iostream>
using namespace std;
class Check
{
private:
int i;
public:
Check(): i(0) { }
void operator ++()
{ ++i; }
void Display()
{ cout << "i=" << i << endl; }
};
int main()
{
Check obj;
// Displays the value of data member i for object obj
obj.Display();
// Invokes operator function void operator ++( )
++obj;
// Displays the value of data member i for object obj
obj.Display();
return 0;
}Output
i=1
#2 Code Example- C++ programing Prefix Increment ++ operator overloading with return type
Code -
C++ Programming
#include <iostream>
using namespace std;
class Check
{
private:
int i;
public:
Check(): i(0) { }
// Return type is Check
Check operator ++()
{
Check temp;
++i;
temp.i = i;
return temp;
}
void Display()
{ cout << "i = " << i << endl; }
};
int main()
{
Check obj, obj1;
obj.Display();
obj1.Display();
obj1 = ++obj;
obj.Display();
obj1.Display();
return 0;
}Output
i = 0
i = 1
i = 1
#3 Code Example- C++ Programing Postfix Increment ++ Operator Overloading
Code -
C++ Programming
#include <iostream>
using namespace std;
class Check
{
private:
int i;
public:
Check(): i(0) { }
Check operator ++ ()
{
Check temp;
temp.i = ++i;
return temp;
}
// Notice int inside barcket which indicates postfix increment.
Check operator ++ (int)
{
Check temp;
temp.i = i++;
return temp;
}
void Display()
{ cout << "i = "<< i <<endl; }
};
int main()
{
Check obj, obj1;
obj.Display();
obj1.Display();
// Operator function is called, only then value of obj is assigned to obj1
obj1 = ++obj;
obj.Display();
obj1.Display();
// Assigns value of obj to obj1, only then operator function is called.
obj1 = obj++;
obj.Display();
obj1.Display();
return 0;
}Output
i = 0
i = 1
i = 1
i = 2
i = 1
#4 Code Example- C++ Programing Operator Overloading of Decrement -- Operator
Code -
C++ Programming
#include <iostream>
using namespace std;
class Check
{
private:
int i;
public:
Check(): i(3) { }
Check operator -- ()
{
Check temp;
temp.i = --i;
return temp;
}
// Notice int inside barcket which indicates postfix decrement.
Check operator -- (int)
{
Check temp;
temp.i = i--;
return temp;
}
void Display()
{ cout << "i = "<< i <<endl; }
};
int main()
{
Check obj, obj1;
obj.Display();
obj1.Display();
// Operator function is called, only then value of obj is assigned to obj1
obj1 = --obj;
obj.Display();
obj1.Display();
// Assigns value of obj to obj1, only then operator function is called.
obj1 = obj--;
obj.Display();
obj1.Display();
return 0;
}Output
i = 3
i = 2
i = 2
i = 1
i = 2
Demonstration
C++ Programing Example of Increment ++ and Decrement -- Operator Overloading-DevsEnv