Axia College Material
Appendix J

Algorithm Verification

Consider the following selection statement where X is an integer test score between 0 and 100.

input X

if (0 <= X and X < 49) output "you fail"

else if (50 <= X and X < 70) output "your grade is" X output "you did OK"

else if (70 <= X and X < 85) output "your grade is" X output "you did well"

else if (85 <= X and X < 100) output "your grade is" X output "you did great"

endif output "how did you do?"

What will be printed if the input is 0? * “you fail” * “how did you do?” *
What will be printed if the input is 100? * “how did you do?” *
What will be printed if the input is 51? * “your grade is 51” * “you did OK” * “how did you do?” *
What will be printed if the user enters “Wingding”?
The program will terminate because it is expecting an integer value and a “Wingding” will cause an error in the program which will cause it to crash. *
Is this design robust? If so, explain why. If not, explain what you can do to make it robust. * The design is not robust as there are no statements for error handling and handling exceptions. To make this code more robust I would add error handling statements like the user can only enter numbers that are between 0 and 100. Also the user cannot enter any strings like winding and other data types, for other numbers and data types the system will display "invalid input. Please enter a number between 0 and 100." Also notice that it doesn't handle the case of entering 49. You need <= 49, as it is now, when you enter 49 all it will say is "how did u do?" same thing with entering 100 and for anything over 100. *
How many levels of nesting are there in this design?
There is one level of nesting in the design. *
Provide a set of values that will test the normal operation of this program segment. Defend your choices. * Test Values
Input (X) Output
10 you fail
45 you fail
88 your grade is 88 – You did great
68 your grade is 68 – You did OK *
Provide a set of test values that will cause each of the branches to be executed.
Test Values
Input (X) Output
30 you fail
65 your grade is 65 – You did OK
83 your grade is 83 – You did well
92 your grade is 92 – You did great
450 how did you do?

* Provide a set of test values that test the abnormal operation of this program segment.
Test Values
Input (X) Output
Hello how did you do?
125 how did you do?
What how did you do?