Example of Operator Overloading in Unary Operator : Prefix/Postfix : C++

Here we have shown you the example of operator overloading in unary operator (-) in Prefix and Postfix both form. And we have decremented the values of different objects directly through operator overloading.

 //Operator overloading in Unary Operator
#include<iostream>
using namespace std;
class complex{
    private:
        int real,imaginary;
    public:
        complex(){  //Default constructor
            real=0;
            imaginary=0;
        }
        complex(int r, int i){  //Parameterizeed Constructor
            real=r;
            imaginary=i;
        }    
        void display(){
            cout<< "The real part is: " <<real <<endl;
            cout<< "The imaginary part is: " <<imaginary <<"i" <<endl;
        }    
        void operator --(){ //operator overloading function : prefix decrement
            real=--real;
            imaginary=--imaginary;
        }
        void operator --(int){  //postfix decrement
            real=real--;
            imaginary=imaginary--;
        }
};
int main(){
    complex c1(5,7), c2(10,11);  //Object creation and passing arguments to constructors
    //Prefix
    cout<<"Before pre decrement: " <<endl;
    c1.display();
    --c1;  //Decrementing value of object c1 through operator overloading
    cout<<endl <<"After pre decrement: " <<endl;
    c1.display();
    
    //Postifix
    cout<<endl <<"Before Post decrement: " <<endl;
    c2.display();
    --c2;  //Decrementing value of object c2 through operator overloading
    cout<<endl <<"After Post decrement: " <<endl;
    c2.display();
        return 0;
}

Output: 

You have to use (int) while working with unary operators for postfix.

We have used Dev C++ IDE for this program. If you have any queries regarding this, you can leave a comments as well. 

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