C13-14
The problems in this problem set cover lectures C13 and C14
1.
a. Define a robust algorithm to carry out integer division using repeated subtraction.
Your algorithm accepts two integers and returns the quotient and the remainder.
Hint: What are the preconditions and postconditions of your algorithm?
b. Implement your algorithm as an Ada95 program, using exception handling to
provide robustness.
Turn in a hard copy of your algorithm and code listing, and an electronic copy of your
code.
2.
a. What is the cyclomatic complexity of the code fragment shown below?
loop
exit when Flag := True;
if A < 100 and B > 200 then
if A > 50 then
Sum := Sum +2;
else
Sum := Sum +1;
end if;
else
if B < 300 then
Sum:= Sum -1;
else
Sum := Sum -2;
end if;
end if;
end loop;
Hint: Draw the control flow graph
b. What is the minimum number of test cases needed to test the fragment of code
shown below? Justify your answer.
if A < 100 and B > 200 then
if A > 50 then
Sum := Sum +2;
else
Sum := Sum +1;
end if;
else
if B < 300 then
Sum:= Sum -1;
else
Sum := Sum -2;
end if;
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