Operator Overloading Lab

CSC-166 · Semester II · Object Oriented Programming

intermediate30 minAvailable

C++in-browser interpreter · runs locally

#include <iostream>
using namespace std;

class Complex {
public:
  int r, i;

  Complex add(Complex o) {
    Complex c;
    c.r = r + o.r;
    c.i = i + o.i;
    return c;
  }
};

int main() {
  Complex a, b, c;
  a.r = 1; a.i = 2;
  b.r = 3; b.i = 4;
  c = a.add(b);
  cout << c.r << " + " << c.i << "i" << endl;
  return 0;
}

24 lines

Output

Write some code, then press Run. Stdout and errors appear here.

Lab brief

Objective

Overload arithmetic operators for a Complex class and verify results against hand computation.

Theory & concepts

A Complex number has a real and an imaginary part. Overloading + and - as member functions lets you write a + b naturally. Each operator creates and returns a new Complex value.

Rendering diagram…

Complex class with overloaded operators

Complex operator+(const Complex& o) const {
    return Complex(re + o.re, im + o.im);
}
Complex operator-(const Complex& o) const {
    return Complex(re - o.re, im - o.im);
}

Prerequisites

Lesson: Overloading binary operators
Lesson: Rules of operator overloading

Instructions

1Create class Complex with private double re and im and a parameterized constructor.
2Overload +, - and * as member functions.
3Overload == to compare two Complex values and << to print them.
4Test with (3,2) + (1,4) and verify re=4, im=6 by hand.
5Print results and compare with the hand-computed values.

Tasks

Overload + - *
Implement the three arithmetic operators for Complex.
Print and compare
Overload << so cout << c prints '(re, im)', and verify outputs.
Multiplication check
Compute (1,2) * (3,4) by hand: (3-8, 4+6) = (-5, 10); verify.

Self-check

Arithmetic results match hand computation.
The overloaded << produces readable output.
== distinguishes equal and unequal complex numbers.

Environment

editorstdout consolecompiler errorstest cases