Classes – Complex Numbers

#include <iostream.h>
#include <conio.h>

class complexnum
{
int real, imaginary;
public:
void readdata()
{
cout<<endl<<“Enter real part of complex number : “;
cin>>real;
cout<<“Enter imaginary part of complex number : “;
cin>>imaginary;
}
void display()
{
cout<<real<<” + “<<imaginary<<“i”;
}
complexnum addcomplex(complexnum n1, complexnum n2)
{
complexnum n3;
n3.real = n1.real + n2.real;
n3.imaginary = n1.imaginary + n2.imaginary;
return n3;
}
complexnum subcomplex(complexnum n1, complexnum n2)
{
complexnum n3;
n3.real = n1.real – n2.real;
n3.imaginary = n1.imaginary – n2.imaginary;
return n3;
}
} num1, num2, num3;

void main()
{
clrscr();
int ch;
char choice;
cout<<endl<<“Program to carry out operations on complex numbers”
<<“\n\nEnter first complex number : “;
num1.readdata();
cout<<endl<<“Enter second complex number : “;
num2.readdata();
do
{
cout<<endl<<“Program Menu”<<endl
<<“1. Add the two complex numbers”<<endl
<<“2. Subtract the two complex numbers”<<endl
<<“Enter your choice : “;
cin>>ch;
if (ch == 1)
{
num3 = num3.addcomplex(num1, num2);
cout<<endl<<“Result after addition : “;
num3.display();
}
else if (ch == 2)
{
num3 = num3.subcomplex(num1, num2);
cout<<endl<<“Result after subtraction : “;
num3.display();
}
else cout<<endl<<“You entered an incorrect choice”;
cout<<endl<<“Do you want to continue – y / n : “;
cin>>choice;
} while (choice == ‘y’ || choice == ‘Y’);
cout<<endl;
getch();
}