Question

Program P1

1) integer A, B;

2) input (A);

3) while (A > 0)

4) {

5) B = 1;

6) if (A < 10)

7) B = 0;

8) if (A < 20 or A > 25)

9) B = A * B;

10) else

11) B = A + B;

12) output (A, B);

13) input (A);

14) }

15) output (“Program ends.”);

16) end;

T = {t1=<1>, t2=<33>, t3=<‐1>} or T = {t1=, t2=, t3=}

1. What is the statement domain for P1? Express as line numbers. Exclude syntactical markers, such as {, }, else, and end.

2. What is the statement coverage of T for P1? Express as an unsimplified fraction.

Answer 1

Answer 1

Statement domain contains all the line sequences which will be executed based on input value of A.

In given program if A <= 0 then program will not enter into while loop and exit simply so statement domain for A<=0 will be (1,2,3)

In given program if A < 10 and A > 0 then program will enter into while loop and both If conditions will be true. statement domain will be (1,2,3,5,6,7,8,9,12,13)

In given program if A >10 and A<20 then program will enter into while loop and second If conditions will be true. statement domain will be (1,2,3,5,6,8,9,12,13)

In given program if A >=20 or A<=25 then program will enter into while loop and both If conditions will be false. statement domain will be (1,2,3,5,6,8,11,12,13)

Similarly statement domain for P1 will be

{ (1,2,3), (1,2,3,5,6,7,8,9,12,13), (1,2,3,5,6,8,9,12,13), (1,2,3,5,6,8,11,12,13) }

Answer 2

t1 = 1

Statement domain for t1=1 will be (1,2,3,5,6,7,8,9,12,13)

So, coverage will be = number of lines covered / total lines = 10/11 = 91%

t2 = 33

Statement domain for t2=33 will be (1,2,3,5,6,8,9,12,13)

So, coverage will be = number of lines covered / total lines = 9/11 = 81%

t3 = -1

Statement domain for t3=-1 will be (1,2,3)

So, coverage will be = number of lines covered / total lines = 3/11 = 27%