Answer to Question #320126 in C++ for khan

Question

You are required to create a class for dealing with complex numbers. In this particular

example we are only applying two arithmetic operations over complex number – addition

and subtraction. In complex numbers, we treat the real and imaginary part separately. You

need to define a constant char and assign it ‘i’, indicating the imaginary part. Also declare

two variables for denoting the real part and coefficient of the imaginary part. Define the

appropriate constructors, getters, setters and destructor as per the requirements.

You are required to create an object passing 2 arguments to its constructor, another

constant object with 2 arguments to its constructor. Add them both and store the resultant

object in a third instance by using the concept of copy constructor. Following are the

function prototypes,

Complex()

Complex(int, int)

Complex add(Complex)

void display()

void display() const

Answer 1

#include <iostream>
using namespace std;


class Complex {
public:
    Complex();
    Complex(int r, int i);
    Complex(Complex& z);
    ~Complex();
    int getReal() const;
    void setReal(int r);
    int getImag() const;
    void setImag(int i);
    Complex add(const Complex& z) const;
    Complex sub(const Complex& z) const;
    void display() const;


private:
    const char ch;
    int real;
    int imag;    
};


Complex::Complex() : real(0), imag(0), ch('i')
{}


Complex::Complex(int r, int i) : real(r), imag(i), ch('i')
{}


Complex::Complex(Complex& z)
    : real(z.real), imag(z.imag), ch(z.ch)
{}


Complex::~Complex()
{}


int Complex::getReal() const
{
    return real;
}


void Complex::setReal(int r)
{
    real = r;
}


int Complex::getImag() const
{
    return imag;
}


void Complex::setImag(int i) 
{
    imag = i;
}


Complex Complex::add(const Complex& z) const
{
    int r = real + z.real;
    int i = imag + z.imag;
    return Complex(r, i);
}


Complex Complex::sub(const Complex& z) const
{
    int r = real - z.real;
    int i = imag - z.imag;
    return Complex(r, i);
}


void Complex::display() const
{


    if (real && imag) {
        cout << '(' << real;
        if (imag > 0) {
            cout << " + " << imag << ch << ')';
        }
        else if (imag < 0) {
            cout << " - " << -imag << ch << ')';
        }
    }
    else if (imag) {
        cout << imag << ch;
    }
    else {
        cout << real;
    }


}


int main() {
    Complex z1(1, 2);
    const Complex z2(3, -2);
    Complex z3 = z1.add(z2);


    z1.display();
    cout << " + ";
    z2.display();
    cout << " = ";
    z3.display();
    cout << endl;


    return 0;
}