1.      Program to design a class representing complex numbers and perform addition and multiplication using operator overloading.

1. #include <iostream.h>

2. #include<conio.h>

3. class Complex {

4. public:

5.     double real, imag;

6.  

7.  

8.     // Constructor

9.     Complex(double r = 0, double i = 0) {

10.                 real = r;

11.                 imag = i;

12.     }

13.  

14.     // Overloading + operator

15.     Complex operator+(const Complex& obj) {

16.                 Complex res;

17.                 res.real = real + obj.real;

18.                 res.imag = imag + obj.imag;

19.                 return res;

20.     }

21.  

22.     // Overloading * operator

23.     Complex operator*(const Complex& obj) {

24.                 Complex res;

25.                 res.real = real * obj.real - imag * obj.imag;

26.                 res.imag = real * obj.imag + imag * obj.real;

27.                 return res;

28.     }

29.  

30.     void print() {

31.                 cout << real << " + i" << imag << endl;

32.     }

33. };

34.  

35. int main() {

36.     int c11 , c12 ,c21,c22= 0;

37.  

38.     cout << "Enter 1st Real number & Imagnory number: ";

39.     cin >> c11 >> c12;

40.  

41.     cout << "Enter 2nd Real number & Imagnory number: ";

42.     cin >> c21 >> c22;

43.  

44.     Complex c1(c11, c12), c2(c21, c22);

45.     Complex c3 = c1 + c2;

46.     Complex c4 = c1 * c2;

47.  

48.     cout << "Sum: ";

49.     c3.print();

50.  

51.     cout << "Product: ";

52.     c4.print();

53.     getch();

54.     return 0;

56. }