Item 1-Implementing operator overloading in a complex number Class 3

(3) Define a fully defined class (which can be released as a standalone product and become a "foundation project" in many projects). This class is based on (2), extending the function of the + 、-、 * and/operator so that it can be operated with a double type of data. Set complex C; Double D; The result of C+d and D+c is "add the complex with C as the real Part D", and the other-, *,//operators are similar.

Class Complex {public:    Complex () {real=0;imag=0;}    Complex (double r,double i) {real=r; imag=i;}    Complex operator+ (const Complex &C2);    Complex operator-(const Complex &C2);    Complex operator* (const Complex &C2);    Complex operator/(const Complex &C2);    void display ();p rivate:    double real;    Double imag;};/ /below defines the member function//The following defines the main () function used for testing int main () {    Complex C1 (3,4), C2 (5,-10), C3;    cout<< "c1=";    C1.display ();    cout<< "c2=";    C2.display ();    C3=C1+C2;    cout<< "c1+c2=";    C3.display ();    C3=C1-C2;    cout<< "c1-c2=";    C3.display ();    C3=C1*C2;    cout<< "c1*c2=";    C3.display ();    C3=C1/C2;    cout<< "c1/c2=";    C3.display ();    return 0;}

#include <iostream>using namespace Std;class complex{public:    Complex ()     {         real=0;        imag=0;    }    Complex (double r,double i)     {        real=r;        imag=i;   }    friend Complex operator+ (Complex &c1, Complex &c2);    friend Complex operator+ (double d1, Complex &c2); nbsp;   friend Complex operator+ (Complex &c1, double D2);    friend Complex operator-( Complex &c1, Complex &c2);    friend Complex operator-(double d1, Complex &c2);   & nbsp Friend Complex operator-(Complex &c1, double D2);    friend Complex operator* (Complex &c1, Complex &c2);    friend Complex operator* (double d1, CompLex &c2);    friend Complex operator* (Complex &c1, double D2);    friend Complex operator/(Complex &c1, Complex &c2);    friend Complex operator/(double d1, Complex &c2); nbsp;   friend Complex operator/(Complex &c1, double D2);    void display ();p rivate:     double real;    double imag;}; Complex operator+ (Complex &c1, Complex &c2) {    Complex c;    c.real=c1.real+ c2.real;    c.imag=c1.imag+c2.imag;    return c;} Complex operator+ (double d1, Complex &c2) {    Complex C (d1,0);    return C+C2;} Complex operator+ (Complex &c1, double D2) {    Complex C (d2,0);    return c1+c;} Complex operator-(Complex &c1, Complex &c2) {    Complex c;    c.real= c1.real-c2.real;    C.IMAG=C1.IMAG-C2.IMAG;&Nbsp;   return c;} Complex operator-(double d1, Complex &c2) {    Complex C (d1,0);    return C-C2;} Complex operator-(Complex &c1, double D2) {    Complex C (d2,0);    return c1-c;} Complex operator* (Complex &c1, Complex &c2) {    Complex c;    c.real=c1.real* c2.real-c1.imag*c2.imag;    c.imag=c1.imag*c2.real+c1.real*c2.imag;    return c;} Complex operator* (double d1, Complex &c2) {    Complex C (d1,0);    return C*C2;} Complex operator* (Complex &c1, double D2) {    Complex C (d2,0);    return c1*c;} Complex operator/(Complex &c1, Complex &c2) {    Complex c;    c.real= (c1.real* C2.REAL+C1.IMAG*C2.IMAG)/(C2.real*c2.real+c2.imag*c2.imag);    c.imag= (c1.imag*c2.real-c1.real* C2.IMAG)/(C2.REAL*C2.REAL+C2.IMAG*C2.IMAG);    returnC;} Complex operator/(double d1, Complex &c2) {    Complex C (d1,0);    return C/C2;} Complex operator/(Complex &c1, double D2) {    Complex C (d2,0);    return c1/c;}

 void Complex::d isplay () {    cout<< "(" <<real<< "," <<imag<< "i)" <<endl;} 

int main () {    Complex C1 (3,4), C2 (5,-10),c3;    double d=11;    cout << "c1=";    c1.display ();    cout<< "c2=";    c2.display ( );    cout<< "d=" <<d<<endl<<endl;    cout<< " The following is the calculation result of the overloaded operator: "<<endl;    c3=c1+c2;    cout<<" c1+c2= ";     C3.display ();    cout<< "c1+d=";    (c1+d). Display ();    cout<< "d+c1=";    (D+C1). Display ();    c3=c1-c2;    cout< < "c1-c2=";    c3.display ();    cout<< "c1-d=";    (c1-d). Display ();    cout<< "d-c1=";    (D-C1). Display ();    c3=c1*c2;     cout<< "c1*c2=";    c3.display ();    cout<< "c1*d="; nbsp;   (c1*d). Display ();    cout<< "d*c1=";    (D*C1). display ();     c3=c1/c2;    cout<< "c1/c2=";    c3.display ();     cout<< "c1/d=";    (c1/d). Display ();    cout<< "d/c1=";     (D/C1). Display ();    return 0;}

Item 1-Implementing operator overloading in a complex number Class 3