Assignment No 1

/* Classes and object
Design a class ‘Complex’with data members for real and imaginary part. 
Provide default and Parameterized constructors.
Write a program to perform arithmetic operations of two complex numbers. */
import java.io.*;
import java.util.Scanner;
class Complex
{
    float real, imag;
    Complex()
    {
      real=0;
      imag=0;
    }
    Complex(float p1, float p2)
    {
        real=p1;
        imag=p2;
    }
    public void add(Complex C1, Complex C2)
    {
        float r,i;
              real = C1.real + C2.real;
        imag = C1.imag + C2.imag;
     
    }
    public void sub(Complex C1, Complex C2)
    {
        float r,i;
        real = C1.real - C2.real;
        imag = C1.imag - C2.imag;
    }
        public void mul(Complex C1, Complex C2)
    {
        float r,i;
        real = (C1.real *C2.real ) - (C1.imag * C2.imag);
        imag = ( C1.real *C2.imag) + ( C1.imag * C2.real);
    }
        public void div(Complex C1, Complex C2)
    {
        real = (((C1.real*C2.real)+(C1.imag*C2.imag))/((C2.real*C2.real)+(C2.imag*C2.imag)));
        imag =((( C1.real * C2.imag ) - ( C1.imag * C2.real )) / ((C2.real* C2.real) + (C2.imag * C2.imag)));
    }
    public void display()
    {
        
        System.out.println("Answer is: " + this.real + " + " + this.imag + "i" );
    }
}
class JavaApplication1
{
      public static void main(String args[])
      {
          float num1, num2;
          int choice,cont;
          Scanner input = new Scanner(System.in);
          
          do
          {
          System.out.print("1.Addtion\n");
          System.out.print("2.Subtraction\n");
          System.out.print("3.Multiplication\n");
          System.out.print("4.Division\n");
          System.out.print("Enter your Choice\n");
          choice = input.nextInt(); 
          System.out.print("Enter the First no.\n");
          num1 = input.nextInt(); 
          num2 = input.nextInt(); 
          Complex Obj1 = new Complex(num1,num2);
          
          System.out.print("Enter the Second no.\n");
          num1 = input.nextInt(); 
          num2 = input.nextInt(); 
          Complex Obj2 = new Complex(num1,num2);
          
          Complex res = new Complex();
          switch(choice)
          {
          case 1:
                res.add(Obj1, Obj2);
                res.display();
                break;
          case 2:
              res.sub(Obj1,Obj2);
              res.display();
              break;
          case 3:
                res.mul(Obj1, Obj2);
                res.display();
                break;
          case 4:
                res.div(Obj1, Obj2);
                res.display();
          }
          System.out.print("Do you want to continue Press 1 for yes: \n");
         cont = input.nextInt(); 
          }while(cont==1);
          
      }
}
/* OUTPUT

run:
1.Addtion
2.Subtraction
3.Multiplication
4.Division
Enter your Choice
1
Enter the First no.
10 20
Enter the Second no.
10 20
Answer is: 20.0 + 40.0i
Do you want to continue Press 1 for yes: 
1
1.Addtion
2.Subtraction
3.Multiplication
4.Division
Enter your Choice
2
Enter the First no.
20 10
Enter the Second no.
10 5
Answer is: 10.0 + 5.0i
Do you want to continue Press 1 for yes: 
1
1.Addtion
2.Subtraction
3.Multiplication
4.Division
Enter your Choice
3
Enter the First no.
2 5
Enter the Second no.
4 -3
Answer is: 23.0 + 14.0i
Do you want to continue Press 1 for yes: 
1
1.Addtion
2.Subtraction
3.Multiplication
4.Division
Enter your Choice
4
Enter the First no.
5 1
Enter the Second no.
0 2
Answer is: 0.5 + 2.5i
Do you want to continue Press 1 for yes: 
2
BUILD SUCCESSFUL (total time: 2 minutes 21 seconds)
*/