complex class 구현

Complex Class

C++에서 제공하는 연산자 overloading을 이용해서 복소수를 클래스로 구현해보았다.

복소수 클래스의 멤버 변수들을 외부에서 변경하지 못하게 하기 위해서 private으로 선언하였으며, 멤버 함수는 사칙 연산 및 입출력에 대한 내용에 대해서만 구현을 하였다.

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#ifndef COMPLEX_H #define COMPLEX_H   #include <iostream>   using namespace std;   class Complex{ private:     double real;     double imag; public:     Complex(double real = 0, double imag = 0) : real(real), imag(imag) {}     friend Complex operator+(const Complex& c1, const Complex& c2);     friend Complex operator-(const Complex& c1, const Complex& c2);     friend Complex operator*(const Complex& c1, const Complex& c2);     friend Complex operator/(const Complex& c1, const Complex& c2);       friend bool operator==(const Complex& c1, const Complex& c2);     friend bool operator!=(const Complex& c1, const Complex& c2);       friend ostream& operator<< (ostream& out, const Complex& c);     friend istream& operator>> (istream& in, Complex& c); };   Complex operator+(const Complex& c1, const Complex& c2){     return Complex(c1.real + c2.real, c1.imag + c2.imag); }   Complex operator-(const Complex& c1, const Complex& c2){     return Complex(c1.real - c2.real, c1.imag - c2.imag); }   Complex operator*(const Complex& c1, const Complex& c2){     return Complex(c1.real * c2.real - c1.imag * c2.imag, c1.real * c2.imag + c1.imag * c2.real); }   Complex operator/(const Complex& c1, const Complex& c2){     double common = c2.real * c2.real + c2.imag * c2.imag;     return Complex((c1.real * c2.real + c1.imag * c2.imag)/common, (c1.real * c2.imag - c1.imag * c2.real)/common); }   bool operator==(const Complex& c1, const Complex& c2){     return (c1.real == c2.real) && (c1.imag == c2.imag); }   bool operator!=(const Complex& c1, const Complex& c2){     return !(c1==c2); }   ostream& operator<< (ostream& out, const Complex& c){     out << c.real << " + " << c.imag << "i";     return out; }   istream& operator>> (istream& in, Complex& c){     in >> c.real >> c.imag;     return in; }   #endif

만약 멤버 변수들을 public으로 선언하면 아래와 같이 코드를 수정할 수 있다.

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#ifndef COMPLEX_H #define COMPLEX_H   #include <iostream>   using namespace std;   class Complex{     friend ostream& operator<< (ostream& out, const Complex& c);     friend istream& operator>> (istream& in, Complex& c); public:     Complex(double real = 0, double imag = 0) : real(real), imag(imag) {}     Complex operator+(const Complex& c);     Complex operator-(const Complex& c);     Complex operator*(const Complex& c);     Complex operator/(const Complex& c);       bool operator==(const Complex& c);     bool operator!=(const Complex& c);       double real;     double imag; };   Complex Complex::operator+(const Complex& c){     return Complex(this->real + c.real, this->imag + c.imag); }   Complex Complex::operator-(const Complex& c){     return Complex(this->real - c.real, this->imag - c.imag); }   Complex Complex::operator*(const Complex& c){     return Complex(this->real * c.real - this->imag * c.imag, this->real * c.imag + this->imag * c.real); }   Complex Complex::operator/(const Complex& c){     double common = c.real * c.real + c.imag * c.imag;     return Complex((this->real * c.real + this->imag * c.imag)/common, (this->real * c.imag - this->imag * c.real)/common); }   bool Complex::operator==(const Complex& c){     return (this->real == c.real) && (this->imag == c.imag); }   bool Complex::operator!=(const Complex& c){     return !(*this==c); }   ostream& operator<< (ostream& out, const Complex& c){     out << c.real << " + " << c.imag << "i";     return out; }   istream& operator>> (istream& in, Complex& c){     in >> c.real >> c.imag;     return in; }   #endif

이것을 complex.h라는 헤더파일로 만들어놓고 필요할 때 불러와서 사용해도 된다.