Operator overloading – Complex Number C++

Addition, Subtraction, Multiplication and Division of Complex Number using Operator Overloading

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Example :

 #include<iostream.h>

  class ComplexMath

      {

           private:

              double real;

              double im;

           public:

              void getData();

              ComplexMath operator +(ComplexMath);

              ComplexMath operator -(ComplexMath);

              ComplexMath operator /(ComplexMath);

              ComplexMath operator *(ComplexMath);

              void Disp();

              ComplexMath()

                   {

                        real=0;

                        im=0;

                   }

              ~ComplexMath(){}

  };

  void ComplexMath::getData()

      {

           ComplexMath z,y,x;

           cout<<"\n\tEnter Real : ";

           cin>>real;

           cout<<"\n\tEnter Imaginary : ";

           cin>>im;

      }

  ComplexMath ComplexMath::operator +(ComplexMath C2)

      {

           ComplexMath C3;

           C3.real=real+C2.real;

           C3.im=im+C2.im;

           return C3;

      }

  ComplexMath ComplexMath::operator -(ComplexMath C2)

      {

           ComplexMath C3;

           C3.real=real-C2.real;

           C3.im=im-C2.im;

           return C3;

      }

  ComplexMath ComplexMath::operator /(ComplexMath C2)

      {

           float num = (C2.real*C2.real)+(C2.im*C2.im);

           ComplexMath C3;

           C3.real=(real*C2.real)+(im*C2.im); //Real numerator

           C3.real=C3.real/num;

           C3.im=(im*C2.real)-(real*C2.im);

           C3.im=C3.im/num;

           return C3;

      }

  ComplexMath ComplexMath::operator *(ComplexMath C2)

      {

           ComplexMath C3;

           C3.real=real*C2.real+im*(-C2.im)*(-1); //Real number of the numerator

           C3.im=real*(-C2.im)+im*C2.real; //Imaginary number of the numerator

           return C3;

      }

  void ComplexMath::Disp()

      {

           cout<<real<<","<<im<<"i";

      }

  int main()

      {

           ComplexMath C1,C2,C3;

           int ch=0;

           cout<<"\n\tEnter First Complex No. ";

           C1.getData();

           cout<<"\n\tEnter Second Complex No. ";

           C2.getData();

           while(ch!=5)

              {

                   cout<<"\n\t1. Addition";

                   cout<<"\n\t2. Subtraction";

                   cout<<"\n\t3. Multiplication";

                   cout<<"\n\t4. Division";

                   cout<<"\n\t5. Exit";

                   cout<<"\n\n\t\tChoice? ";

                   cin>>ch;

                   switch (ch)

                        {

                            case 1:

                                C3=C1+C2;

                                C1.Disp();

                                cout<<" + ";

                                C2.Disp();

                                cout<<" = ";

                                C3.Disp();

                                break;

                            case 2:

                                C3=C1-C2;

                                C1.Disp();

                                cout<<" - ";

                                C2.Disp();

                                cout<<" = ";

                                C3.Disp();

                                break;

                            case 3:

                                C3=C1*C2;

                                C1.Disp();

                                cout<<" * ";

                                C2.Disp();

                                cout<<" = ";

                                C3.Disp();

                                break;

                            case 4:

                                C3=C1/C2;

                                C1.Disp();

                                cout<<" / ";

                                C2.Disp();

                                cout<<" = ";

                                C3.Disp();

                                break;

                            case 5:

                                break;

                            default:

                                cout<<"\n\n\t\tWrong Input\n";

                        }

              }

           return 0;

      }