COMPLEX NO.

#include<iostream>
using namespace std;

class complex
{ 
         float a,b;
          
 public : complex()        
          { 
            a=0;
            b=0;
	      }
	 void display();
         complex(float real,float img)
             
        {
	      a=real;
	      b=img;
        }
friend istream & operator >>(istream &din,complex &c1);
friend ostream & operator <<(ostream &dout,complex &c1);

complex operator+(complex);
complex operator-(complex);
complex operator*(complex);
complex operator/(complex);
};
istream & operator >>(istream &din,complex &c)     ////input overloading
	{
		din>>c.a;
		din>>c.b;
		return din;
	}	
ostream & operator <<(ostream &dout,complex &c1)    ////output overloading
	{
		dout<<c1.a;
		dout<<c1.b;
		return dout;
	}
complex complex::operator+(complex x)                ////addition overloading
	{
		complex temp;
		temp.a=a+x.a;
		temp.b=b+x.b;
		return temp;
	}
complex complex::operator-(complex x)              ////subtraction overloading
	{
		complex temp;
		temp.a=a-x.a;
		temp.b=b-x.b;
		return temp;
	}
complex complex::operator*(complex x)              ////multiplication overloading
	{
		complex temp;
		temp.a=((a*x.a)-(b*x.b));
		temp.b=((a*x.b)+(b*x.a));;
		return temp;
	}
complex complex::operator/(complex x)              ////division overloading
	{
		complex temp;
		temp.a=((a*x.a)-(b*x.b))/((x.a*x.a)-(x.b*x.b));
		temp.b=((a*x.b)+(b*x.a))/((x.a*x.a)-(x.b*x.b));
		return temp;
	}
void complex::display()                        //////display
{
cout<<a<<"+"<<b<<"i";
}

int main()
{
complex c1,c2,c3;
int c;
char x;
do
{
cout<<"\n\t MENU: ";                    /////menu
cout<<"\n\t1. Addition: ";
cout<<"\n\t2. Subtraction: ";
cout<<"\n\t3. Multiplication: ";
cout<<"\n\t4. Division: ";
cout<<"\n\t Enter your choice ";
cin>>c;

cout<<"enter first complex no ";
cin>>c1;
cout<<"enter second complex no ";
cin>>c2;
cout<<"\nFirst complex no= ";
c1.display();
cout<<"\nSecond complex no= ";
c2.display();
switch(c)
{
case 1:               
	c3=c1+c2;            
	cout<<"\nAddition = ";
    c3.display();        
	break;


case 2: 	        
	c3=c1-c2;                
	cout<<"\nSubtraction = ";
    c3.display();        
	break;

case 3: 	        
	c3=c1*c2;                
	cout<<"\nMultiplication = ";
	c3.display();        
	break;

case 4: 	        
	c3=c1/c2;                
	cout<<"\nDivision = ";
	c3.display();        
	break;
}
cout<<"\ndo you want to continue?(y/n)";
cin>>x;
}
  while(x=='y'||x=='Y');
}