[C ++] Operator overloading of the plural and Operator Overloading

[C ++] Operator overloading of the plural and Operator Overloading

Definition of operator overloading:

You can perform operations on custom types, such as complex operations. You need to redefine the operator number (create a function ).

Except for the class Relational operators ".", member pointer operators ". *", scope operators ":", sizeof operators, and three-object operators "? : ", All operators in C ++ can be overloaded.

Complex operators are overloaded as follows:

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#include<iostream>#include<string>using namespace std;class Complex;Complex operator+(int x, Complex &c);ostream& operator<<(ostream &out, const Complex &c);istream& operator>>(istream &in, Complex &c);class Complex{friend istream& operator>>(istream &in, Complex &c);friend ostream& operator<<(ostream &out, const Complex &c);friend Complex operator+(int x, Complex &c);public:Complex(const int real = 0, const int imag = 0) :m_real(real), m_imag(imag){}~Complex(){}void Show()const{cout << "(" << m_real << "," << m_imag << ")" << endl;}public:Complex operator+(int x){return Complex(m_real + x, m_imag);}Complex operator+(Complex &c){return Complex(m_real + c.m_real, m_imag + c.m_imag);}Complex operator-(Complex &c){return Complex(m_real - c.m_real, m_imag - c.m_imag);}friend Complex operator+(int x, Complex &c){return Complex(x + c.m_real, c.m_imag);}friend Complex operator-(int x, Complex &c){return Complex(x - c.m_real, -c.m_imag);}Complex operator*(Complex &c);friend Complex operator*(int x, Complex &c);Complex operator/(Complex &c);friend Complex operator/(int x, Complex &c);Complex operator+=(Complex &c);Complex operator-=(Complex &c);Complex operator*=(Complex &c);Complex operator/=(Complex &c);private:int m_real;int m_imag;};Complex Complex::operator/(Complex &c){Complex temp;temp.m_real = (m_real*c.m_real + m_imag*c.m_imag) / (c.m_real*c.m_real + c.m_imag*c.m_imag);temp.m_imag = (m_imag*c.m_real - m_real*c.m_imag) / (c.m_real*c.m_real + c.m_imag*c.m_imag);return temp;}Complex operator/(int x, Complex &c){Complex temp;temp.m_real = (x*c.m_real) / (c.m_real*c.m_real + c.m_imag*c.m_imag);temp.m_imag = (-x*c.m_imag) / (c.m_real*c.m_real + c.m_imag*c.m_imag);return temp;}Complex Complex:: operator+=(Complex &c){m_real = m_real + c.m_real;m_imag = m_imag + c.m_imag;return *this;}Complex Complex::operator-=(Complex &c){m_real = m_real - c.m_real;m_imag = m_imag - c.m_imag;return *this;}Complex Complex:: operator*(Complex &c){return Complex(m_real*c.m_real - m_imag*c.m_imag, m_imag*c.m_real + m_real*c.m_imag);}Complex operator*(int x, Complex &c){return Complex(c.m_real*x, c.m_imag*x);}Complex Complex::operator*=(Complex &c){int i = m_real;m_real = m_real*c.m_real - m_imag*c.m_imag;m_imag = m_imag*c.m_real + i*c.m_imag;return *this;}Complex Complex:: operator/=(Complex &c){m_real = (m_real*c.m_real + m_imag*c.m_imag) / (c.m_real*c.m_real + c.m_imag*c.m_imag);m_imag = (m_imag*c.m_real - m_real*c.m_imag) / (c.m_real*c.m_real + c.m_imag*c.m_imag);return *this;}ostream& operator<<(ostream &out, const Complex &c){out << "(" << c.m_real << "," << c.m_imag << ")";return out;}istream& operator>>(istream &in, Complex &c){in >> c.m_real >> c.m_imag;return in;}int main(){Complex c1(2, 1);Complex c2(3, 2);Complex c;c = c1 + c2;cout<<c1<<"+"<<c2<<"="<<c<<endl;c = c1 * c2;cout << c1 << "*" << c2 << "=" << c << endl;c = c1 / c2;cout << c1 << "*" << c2 << "=" << c << endl;c = 2 + c1;cout <<"2"<< "+" << c1 << "=" << c << endl;//    c1+=c2;//    cout<<c1<<endl;//    c1-=c2;//    cout<<c1<<endl;c1 *= c2;cout << c1 << endl;c1 /= c2;cout << c1 << endl;c = 4 / c1;cout << c << endl; Complex c3; cin>>c3; cout<<c3;return 0;}

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Running result: