Unary operators are those special symbols that can operate on a unary or single operand, for instance, ++(increment), --(decrement) and ! (not) operators. As we have already discussed in the Operator overloading rules that we can only redefine the operator task for the user-defined class-based object so here the example itself using a class and its object to perform the operator overloading implementation. Example
#include <iostream>
#include<math.h>
using namespace std;
class Displacement
{
private :
int x;
public:
Displacement(int initialize) //counstructor
{
x=initialize;
cout<<"you have created an object which need to displace 10 unit";
cout<<endl;
}
void operator--() //operator overloading for -- operator
{
x-=1;
cout<<"1 unit has been deducted from the Displacement now final displacement is: "<<x;
cout<<endl;
}
void operator++() //operator overloading for ++ operator
{
x+=1;
cout<<"1 unit has been added to the Displacement and final Displacement is: "<<x;
cout<<endl;
}
void operator!()
{
if(x>0){
x = -x;
cout<<"The the direction of Displacement has been changed final displacement is: "<<x;
cout<<endl;
}
else{
x= abs(x);
cout<<"The direction of Displacement has been changed final displacement is: "<<x;
cout<<endl;
}
}
};
int main()
{
Displacement d(10); // create an object
++d; // prefix increment operator on class object
--d; // prefix decrement operator on class object
!d; // not operator on class object
return 0;
}
Output
you have created an object which need to displace 10 unit 1 unit has been added to the Displacement and final Displacement is: 11 1 unit has been deducted from the Displacement now final displacement is: 10 The direction of Displacement has been changed final displacement is: -10
Behind the code In this above example, we have created 3 Operator Overloading functions, which redefine the task for ++, -- and ! operators. So when we apply these operators on the Displacement class object d the corresponding function gets invoked, Displacement d(10); this statement invoked the Class constructor method or member function Displacement(int initialize) . ++d; this statement invoked the void operator++() member function. --d; this statement invoked the void operator--() member function. And !d; this statement invoked the void operator!() member function. Note: In unary operator overloading, we do not pass any argument in the operator overloading function because the operator works on a single operand which would be the class object itself. People are also reading:
