Consider a program for the purpose of the nature of roots of a quadratic equation. Its input is the triple of positive integers say a, b, c as well as values in the interval [0,100]. The program output possibly one of the following:

[Not a quadratic equation; Real roots; Imaginary roots; Equal roots]. Design the boundary value test cases as well as robust test cases for the program.

Ans Quadratic equation will be of type:

ax2 + bx + c = 0

Roots are real if ( 4 ) 0 2 b - ac >

Roots are imaginary if ( 4 ) 0 2 b - ac <

Roots are equal if ( 4 ) 0 2 b - ac =

Equation isn't quadratic if a=0

The boundary value test cases are

As we know robust test cases are 6n+1 therefore in 3 variable input cases total numbers of test cases are 19 as given below: