how to overload a operand cpp code example
Example 1: c++ overload operator
#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);
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;
}
Example 2: c++ overload operator
#include <iostream>
class ExampleClass {
public:
ExampleClass() {}
ExampleClass(int ex) {
example_ = 0;
}
int& example() { return example_; }
const int& example() const { return example_; }
//Overload the "+" Operator
ExampleClass operator+ (const ExampleClass& second_object_of_class) {
ExampleClass object_of_class;
object_of_class.example() = this -> example() + second_object_of_class.example();
return object_of_class;
}
private:
int example_;
};
int main() {
ExampleClass c1, c2;
c1.example() = 1;
c2.example() = 2;
ExampleClass c3 = c1 + c2;
//Calls operator+() of c1 with c2 as second_object_of_class
//c3 gets set to object_of_class
std::cout << c3.example();
}
Example 3: operator ++ overloading c++
class Point
{
public:
Point& operator++() { ... } // prefix
Point operator++(int) { ... } // postfix
friend Point& operator++(Point &p); // friend prefix
friend Point operator++(Point &p, int); // friend postfix
// in Microsoft Docs written "friend Point& operator++(Point &p, int);"
};