4. (A) Overload the operator unary(-) for demonstrating operator overloading

4. (A) Overload the operator unary(-) for demonstrating operator overloading

	#include <iostream.h> #include<conio.h>
	class Distance
	{
	private:
	int feet;
	int inches;
	public:
	Distance(){
	feet = 0;
	inches = 0;
	}
	Distance(int f, int i){
	feet = f;
	inches = i;
	}
	void displayDistance() {
	cout << "F: " << feet << " I:" << inches <<endl;
	}
	// overloaded minus (-) operator
	Distance operator- () {
	feet = -feet;
	inches = -inches;
	return Distance(feet, inches);
	}
	};
	void main()
	{
	clrscr();
	Distance D1(11, 10), D2(-5, 11);
	cout<<"\n\nBefore overloading unary(-) operator : ";
	D1.displayDistance();
	cout<<"After unary(-) operator overloading : ";
	-D1;
	D1.displayDistance();
	cout<<"Before overloading unary(-) operator : ";
	D2.displayDistance();
	cout<<"After unary(-) operator overloading : ";
	-D2;
	D2.displayDistance();
	getch();
	}