Chapter 13, Problem 13.20PE

(Algebra: solve quadratic equations) Rewrite Programming Exercise 3.1 to obtain imaginary roots if the determinant is less than 0 using the Complex class in Programming Exercise 13.17. Here are some sample runs:

Enter a, b, c: 1 3 1 The roots are –0.381966 and –2.61803

Enter a, b, c: 1 2 1 The root is –1

Enter a, b, c: 1 2 3 The roots are –1.0 + 1.4142i and –1.0 + 4142i