Consider the following triangle classication system, originally used by Myers [1

Question

Consider the following triangle classication system, originally used by Myers [16]: The system reads in three positive values from the standard input. The three values A, B, and C are interpreted as representing the lengths of the sides of a triangle. The system then prints a message on the standard output saying whether the triangle is scalene, isosceles, equilateral, or right angled if a triangle can be formed. Answer the following questions for the above program: Part a: What is the input domain of the system? Part b: What are the input conditions? Part c: Identify the equivalence classes for the system? Part d: Identify test cases to cover the identied ECs?

Explanation / Answer

Please find the answers for the question answer parts :

Part a:

What is the input domain of the system?

Input domain of the system is the inputs passed to the program. i.e Three side lengths of the Triangle under test.

Example : TriangleClassification (7, 9, 9);

Part b:

What are the input conditions?

Input conditions are valid inputs and invalid inputs. For length of triangle side input, we require a positive side length. A valid input to the program returns a valid program output. An invalid input is an input the program responds with an error.

Example: Valid Input:
new TriangleClassification (7, 9, 9);

Invalid input:
new TriangleClassification (-7, -9, -9);

Part c:
Identify the equivalence classes for the system?

Equivalence classes are test case execution minimization techniques. An equivalence class is a set of inputs that the program treats as identical.

Equivalence classes for the system can be identified as below:

EqClass_Scalene - to test the Scalene triangle type
EqClass_RightAngled - to test the Right Angled triangle type
EqClass_Isosceles   - to test the Isosceles Triangle
EqClass_Equilateral - to test the Equilateral Triangle
EqClass_NotTriangled
EqClass_Invalid1   to test Invalid side length
EqClass_Invalid2
EqClass_Invalid3;

Part d:
Identify test cases to cover the identied ECs?

TestInputs                                      Outputs

TriangleClassification(3, 5, 7);        Scalene Triangle

TriangleClassification(3, 4,5 );        Right Angled Triangle

TriangleClassification(3, 3, 3);        Equilateral Triangle

TriangleClassification(3, 4, 4);        Isosceles Triangle

TriangleClassification(2, 3, 9);        Check Input.Do not form a triangle

TriangleClassification(-3, 4, 4);        ERROR : negative sides

TriangleClassification(3, -4, 4);        ERROR : negative sides

TriangleClassification(3, 4, -4);        ERROR : negative sides

Sample Program:

/*

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