Consider a program for the determination of the nature of roots of a quadratic equation.

Its input is a triple of positive integers (say

a, b and

c) and values may be from interval

[0, 100]. The output may have one of the following words:

[Not a quadratic equation, Real roots, Imaginary roots, Equal roots]

(a) Design boundary value analysis test cases, robust test cases, worst-case test cases and robust worst-case test cases

(b) Create equivalence classes and generate test cases

(c) Develop a decision table and generate test cases