assignment2

// write a program that performs linear and quadratic calculations

import java.util.Scanner;

  public class assignment2
  {
    public static void main(String [] args)
    {
      
      // set variables
      double A, B, C, D, altRoot, root1, root2;
      
      // set object kb to the main Scanner
      Scanner kb = new Scanner(System.in);
      
      //enter the values A, B, C, for quadratic formula/equation
      System.out.println("Enter values for A, B and C");
      A = kb.nextDouble();
      B = kb.nextDouble();
      C = kb.nextDouble();
      
      // print the new full quadratic equation
      System.out.println("The Quadratic Equation is ");
      System.out.println(A+"x^2 + " + B+"x + " + C + " = 0");        
  
      // calculate discriminant from quadtratic formula 
      D = (B*B) - (4 * A * C);     
      System.out.println("The discriminant is " + D + " according to quadratic formula");
      
      if (A == 0 && B == 0) // if both A and B equal 0 then the equation has no solution 
      {
        System.out.println("The System Has No Solution "); 
      }
      else if (A == 0) // if just A is 0 then there is an alternate root -C/B
      {
        altRoot = -C/B; 
        System.out.println("Both roots both equal -C/B because A = 0 ");
        System.out.println("Therfore the altnernate root is " + altRoot);
      }
      else if (D < 0) // if D is less than 0 then the roots are imaginary
      {
        System.out.println("Roots are imaginary ");
      }
      else if (D > 0) // if D is greater than 0 then the roots are real and given by the quadtratic formula 
      {
        root1 = -B + (Math.sqrt(D))/(2*A);
        root2 = -B - (Math.sqrt(D))/(2*A);
        System.out.println("The first root is " + root1);
        System.out.println("The second root is " + root2);
      }
      else if (D == 0) // if D equals 0 then there is another alternate root equation -B/2A
      {
        altRoot = -B/(2*A);
        System.out.println("The roots are both equal to -B/2A because discriminant = 0");
        System.out.println("Therefore the alternate root is " + altRoot);
      }
         
    } // end main
  } // end class