Unary Operator Overloading in C++
Unary Operator Overloading
Unary Operator overloading in C++ allows us to use operators with objects and provide our own unique implementation of how operators interact with objects.
Unary Operator Overloading in C++
- Overloading ++ / — operator is used to increment/decrement multiple member variables at once
- Overloading + operator is used to concatenate two strings.
Note
Unary Operator Overloading in C++ works with only single class object
Syntax:
return_type:: operator unary_operator_symbol(parameters)
{
// function definition
}Example
void operator ++() // operater overloading function
{
a = ++a;
b = ++b;
} 
Addition/subtraction of Complex numbers using operator overloading
Let us look at an example below –
Run
#include<bits/stdc++.h>
using namespace std;
class Complex
{
int a, b, c;
public:
Complex(int a1, int b1){ // paramterized constructor
a = a1;
b = b1;
}
void operator ++(){ //operater overloading function
a = ++a;
b = ++b;
}
void operator --(){ //operater overloading function
a = --a;
b = --b;
}
void display(){
cout << a << " + " << b << "i" << endl;
}
};
int main()
{
Complex obj(20,15);
++obj;
cout << "Increment Complex Number\n";
obj.display();
--obj;
cout << "\nDecrement Complex Number\n";
obj.display();
return 0;
}
Output
Increment Complex Number 21 + 16i Decrement Complex Number 20 + 15i
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