Question

Question 4: Provide at least 4 test cases.

Prompt the user to input 3 doubles, a, b and c. Which will represent the coefficients in the quadratic equation ax² + bx + c = 0. Print out the solutions (if any) of the quadratic equation. If no root exists (this happens if a == 0, or b² <4ac) print the message No real root.

Sample input/ user entries shown in red	Corresponding output
Enter a, b and c which represent the coefficients in the quadratic equation ax^2 + bx + c = 0 : 1 0 -8	Root1 is 2.828427 Root2 is -2.828422
Enter a, b and c which represent the coefficients in the quadratic equation ax^2 + bx + c = 0 : 0 3 5	No real root
Enter a, b and c which represent the coefficients in the quadratic equation ax^2 + bx + c = 0 : 1 5 -5	Root1 is 0.854101 Root2 is -5.854101

Test #	Valid / Invalid Data	Description of test	Input Value	Actual Output	Test Pass / Fail
1	Valid
2	Valid
3	Valid
4	Valid

Answer 1

Test cases

Test #	Valid / Invalid Data	Description of test	Input Value	Actual Output	Test Pass / Fail
1	Valid	Testing for real roots	a=1 b=5 c=6	Root1=-2 Root2=-3	Pass
2	Valid	Testing for real roots	a=1 b=-3 c=-10	Root1=5 Root2=-2	Pass
3	Valid	Testing for a=0 for no real roots	a=0 b=-3 c=-10	No Real roots	Pass
4	Valid	Testing for b^2-4ac=0 for no real roots	a=1 b=4 c=1	No Read roots	Pass

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