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Experiment-10
Program of overloading the binary operators.
#include <iostream>
using namespace std;
class A
{
int x;
public:
A(){}
A(int i)
{
x=i;
}
void operator+(A);
void display();
};
void A :: operator+(A a)
{
int m = x+a.x;
cout<<"The result of the addition of two objects is : "<<m;
}
int main()
{
A a1(5);
A a2(4);
a1+a2;
return 0;
}
Output:
The result of the addition of two objects is : 9
Example to show the concept of operator over loading using a member function. Here an object is passed as
an argument whose properties will be accessed using this object, the object which will call this operator can be
accessed using this operator as explained below −
#include <iostream>
using namespace std;
class Box {
public:
double getVolume(void) {
return length * breadth * height;
}
void setLength( double len ) {
length = len;
}
void setBreadth( double bre ) {
breadth = bre;
}
void setHeight( double hei ) {
height = hei;
}
// Overload + operator to add two Box objects.
Box operator+(const Box& b) {
Box box;
box.length = this->length + b.length;
box.breadth = this->breadth + b.breadth;
box.height = this->height + b.height;
return box;
}
private:
double length; // Length of a box
double breadth; // Breadth of a box
double height; // Height of a box
};
// Main function for the program
int main() {
Box Box1; // Declare Box1 of type Box
Box Box2; // Declare Box2 of type Box
Box Box3; // Declare Box3 of type Box
double volume = 0.0; // Store the volume of a box here
// box 1 specification
Box1.setLength(6.0);
Box1.setBreadth(7.0);
Box1.setHeight(5.0);
// box 2 specification
Box2.setLength(12.0);
Box2.setBreadth(13.0); 18*21*15
Box2.setHeight(10.0);
// volume of box 1
volume = Box1.getVolume();
cout << "Volume of Box1 : " << volume <<endl;
// volume of box 2
volume = Box2.getVolume();
cout << "Volume of Box2 : " << volume <<endl;
// Add two object as follows:
Box3 = Box1 + Box2;
// volume of box 3
volume = Box3.getVolume();
cout << "Volume of Box3 : " << volume <<endl;
return 0;
}
When the above code is compiled and executed, it produces the following result −
Volume of Box1 : 210
Volume of Box2 : 1560
Volume of Box3 : 5400
Unary Operators Overloading in C++
The unary operators operate on a single operand and following are the examples of Unary operators −
The increment (++) and decrement (--) operators.
The unary minus (-) operator.
The logical not (!) operator.
The unary operators operate on the object for which they were called and normally, this operator appears on the
left side of the object, as in !obj, -obj, and ++obj but sometime they can be used as postfix as well like obj++ or
obj--.
Following example explain how minus (-) operator can be overloaded for prefix as well as postfix usage.
#include <iostream>
using namespace std;
class Distance {
private:
int feet; // 0 to infinite
int inches; // 0 to 12
public:
// required constructors
Distance() {
feet = 0;
inches = 0;
}
Distance(int f, int i) {
feet = f;
inches = i;
}
// method to display distance
void displayDistance() {
cout << "F: " << feet << " I:" << inches <<endl;
}
// overloaded minus (-) operator
Distance operator- () {
feet = -feet;
inches = -inches;
return Distance(feet, inches);
}
};
int main() {
Distance D1(11, 10), D2(-5, 11);
-D1; // apply negation
D1.displayDistance(); // display D1
-D2; // apply negation
D2.displayDistance(); // display D2
return 0;
}
When the above code is compiled and executed, it produces the following result −
F: -11 I:-10
F: 5 I:-11
