Complex.cpp

Code

/*
    Complex.cpp
    CIS 250
    David Klick
    2009-02-23

    Implementation of Complex number class.
   
    Please note that comparing complex numbers for ordering
    does not make much sense, so <, <=, >, >= are just
    made-up so we can demonstrate how those operators can
    be overloaded.
*/

#include "Complex.h"

// constructors
Complex::Complex() { init(0.0, 0.0); }
Complex::Complex(const double r, const double i) { init(r, i); }

// shared initialization routine called by constructors
void Complex::init(const double r, const double i) {
    real = r;
    imag = i;
}

// accessor methods
double Complex::getReal() const { return real; }
double Complex::getComplex() const { return imag; }

// overloaded relational operators
bool Complex::operator==(const Complex& c) const {
    return real==c.real && imag==c.imag;
}
bool Complex::operator!=(const Complex& c) const {
    return real!=c.real || imag!=c.imag;
}
bool Complex::operator<(const Complex& c) const {
    return real<c.real || (real==c.real && imag<c.imag);
}
bool Complex::operator>(const Complex& c) const {
    return real>c.real || (real==c.real && imag>c.imag);
}
bool Complex::operator<=(const Complex& c) const {
    return real<c.real || (real==c.real && imag<=c.imag);
}
bool Complex::operator>=(const Complex& c) const {
    return real>c.real || (real==c.real && imag>=c.imag);
}

// overloaded preincrement and predecrement operators
Complex Complex::operator++() {
    real += 1.0;
    return *this;
}

Complex Complex::operator--() {
    real -= 1.0;
    return *this;
}

// overloaded postincrement and prostdecrement operators
Complex Complex::operator++(int) {
    Complex tmp(real, imag);
    real += 1.0;
    return tmp;
}

Complex Complex::operator--(int) {
    Complex tmp(real, imag);
    real -= 1.0;
    return tmp;
}

// overloaded math operators
Complex Complex::operator+(const Complex& c) const {
    Complex tmp(real+c.real, imag+c.imag);
    return tmp;
}

Complex Complex::operator-(const Complex& c) const {
    Complex tmp(real-c.real, imag-c.imag);
    return tmp;
}

Complex Complex::operator*(const Complex& c) const {
    Complex tmp;
    tmp.real = real*c.real - imag*c.imag;
    tmp.imag = real*c.imag + imag*c.real;
    return tmp;
}

Complex Complex::operator/(const Complex& c) const {
    Complex tmp;
    double y = c.real*c.real + c.imag*c.imag;
    tmp.real = (real*c.real + imag*c.imag) / y;
    tmp.imag = (real*-c.imag + c.real*imag) / y;
    return tmp;
}

ostream& operator<<(ostream& strm, const Complex& c) {
    strm << c.real;
    if (c.imag < 0.0) strm << " - " << -c.imag << 'i';
    else if (c.imag == 1.0) strm << " + i";
    else strm << " + " << c.imag << 'i';
    return strm;
}

istream& operator>>(istream& strm, Complex& c) {
    cout << "Enter real part of number: ";
    strm >> c.real;
    cout << "Enter imaginary part of number: ";
    strm >> c.imag;
    return strm;
}