Write a more general and more robust version of Quadratic (PROGRAM 1.2.3) that prints the...

Write a more general and more robust version of Quadratic (PROGRAM 1.2.3) that prints the roots of the polynomial ax2 + bx + c, prints an appropriate message if the discriminant is negative, and behaves appropriately (avoiding division by zero) if a is zero.

Program 1.2.3 Quadratic formula