Source Code : Applying the quadratic formula

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Applying the quadratic formula

         
/*
Java Programming for Engineers
Julio Sanchez
Maria P. Canton


ISBN: 0849308100
Publisher: CRC Press
*/

// Java for Engineers
//Filename: QuadSolv
//Reference: Chapter 24
//Description:
//         Applying the quadratic formula
//Requires:
//         Keyin class in current directory


strictfp class QuadSolv
{
public static void main(String[] args)
{
      
     double a, b, c, discr, root1, root2;

     // Apllying the quadratic formula
     // Obtain sides from user
     System.out.println("Applying the quadratic formula");
     a = 1d;
     b = 2d;
     c = 3d;

     // Solve the discriminant (SQRT (b^2 - 4ac)
     discr = Math.sqrt((b * b) - (4 * a * c));
     System.out.println("Discriminant = " + discr);
     // Determine number of roots
     // if discr > 0 equation has 2 real roots
     // if discr == 0 equation has a repeated real root
     // if discr < 0 equation has imaginary roots
     // if discr is NaN equation has no roots

     // Test for NaN
     if(Double.isNaN(discr))
        System.out.println("Equation has no roots");
     
     if(discr > 0)
     {
        System.out.println("Equation has 2 roots");
        root1 = (-b + discr)/2 * a;
        root2 = (-b - discr)/2 * a;
        System.out.println("First root = " + root1);
        System.out.println("Second roor = " + root2);
      }

      if(discr == 0)
      {
        System.out.println("Equation has 1 root");
        root1 = (-b + discr)/2 * a;
        System.out.println("Root = " + root1);
      }

       if(discr < 0)
         System.out.println("Equation has imaginary roots");

}
}



           
         
    
    
    
    
    
    
    
    
  

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