A1.cpp

/* OOPL - ASSIGNMENT - A1 */

#include<iostream>
using namespace std;

class complex {
	float real;
	float img;

	public:
		friend complex operator+(complex, complex);
		friend complex operator-(complex, complex);
		friend complex operator*(complex, complex);
		friend complex operator/(complex, complex);
		friend ostream & operator<<(ostream&, complex&);
		friend istream & operator>>(istream&, complex&);

	complex() {
		real=0;
		img=0;
	}

	~complex(){}
};

complex operator+(complex c, complex d) {
	complex temp;
	temp.real = d.real + c.real;
	temp.img = d.img + c.img;
	return temp;
}

complex operator-(complex c, complex d) {
	complex temp;
	temp.real = c.real - d.real;
	temp.img = c.img - d.img;
	return temp;
}

complex operator*(complex c, complex d) {
	complex temp;
	temp.real = c.real * d.real - c.img * d.img;
	temp.img = c.real * d.img+c.img * d.real;
	return temp;
}

complex operator/(complex c, complex d) {
	complex temp;
	int mod = d.real * d.real + d.img * d.img;
	d.img = -1 * d.img;
	temp = c *d ;
	temp.real /= mod;
	temp.img /= mod;
	return temp;
}

ostream & operator << (ostream &out, complex &c) {
    if (c.img >= 0)
	    out << c.real << " + " << c.img << "i\n";
    else
	    out << c.real << c.img << "i\n";
    return out;
}

istream & operator >> (istream &in, complex &c) {
    cout << "Enter Real Part: ";
    in >> c.real;
    cout << "Enter Imaginary Part: ";
    in >> c.img;
    return in;
}

int main() {
	complex c1, c2, c3;
	int ch;

	cin >> c1;		    //calling of operator overloading function
	cin >> c2;

	cout << "\n" << c1;			//default constructor
	cout << c2;

	do {
        cout << "\n\nEnter\n1.Addition\n2.Subtraction\n3.Multiplication\n4.Division\n0.Exit\n";
		cout << "Enter your choice: ";
		cin >> ch;
		switch(ch) {
			case 0:
			    break;
			case 1:
				c3 = c1 + c2;
				cout << "\nAddition: ";
				cout << c3;
			    break;
			case 2:
				c3 = c1 - c2;
				cout << "\nSubtraction: ";
				cout << c3;
			    break;
			case 3:
				c3 = c1 * c2;
				cout << "\nMultiplication: ";
				cout << c3;
			    break;
			case 4:
				c3 = c1 / c2;
				cout << "\nDivision: ";
				cout << c3;
				break;
			default:
				cout << "\nInvalid choice\n";
		}
	} while(ch!=0);

	return 0;
}



/*

----------------- OUTPUT ------------------

Enter Real Part: 5
Enter Imaginary Part: 1
Enter Real Part: 2
Enter Imaginary Part: 7

5 + 1i
2 + 7i


Enter
1.Addition
2.Subtraction
3.Multiplication
4.Division
0.Exit
Enter your choice: 1

Addition: 7 + 8i


Enter
1.Addition
2.Subtraction
3.Multiplication
4.Division
0.Exit
Enter your choice: 2

Subtraction: 3-6i


Enter
1.Addition
2.Subtraction
3.Multiplication
4.Division
0.Exit
Enter your choice: 3

Multiplication: 3 + 37i


Enter
1.Addition
2.Subtraction
3.Multiplication
4.Division
0.Exit
Enter your choice: 4

Division: 0.320755-0.622642i


Enter
1.Addition
2.Subtraction
3.Multiplication
4.Division
0.Exit
Enter your choice: 0

*/