Computer Science Final
A program that Thomas has written is complete. It has been tested thoroughly, and some
outputs were not as expected. Thomas is now going through the code carefully attempting to establish
the cause of these errors and change the code to remove them. What is this procedure called?
debugging
Understanding of the life cycle of a program is an essential component to becoming an effective
programmer. Which of the following is the best example of how the life cycle of a program should work?
Idea→algorithm→write code→execute code→debug→maintain
Jeremiah is part of a group planning a summer fair at which local businesses can run stalls and
events. He wants to use his programming skills to develop an app for the fair which businesses will be
able to use to communicate information about their activities at the fair with visitors. Which of the
following would be the best first step for Jeremiah to take?
Find out from the businesses and potential visitors what information and format they think
should be used for the app
Consider the following two implementations of the same algorithm, each written in a different
language.
Language A:Calculate the average daily rainfall for the week (averageRainfall) by adding together
the rainfall totals for each of the 7 days of the week (sun, mon, tue, wed, thu, fri, and sat) and dividing
the sum by 7.
, Language B:Take the total amount of rain from each day of the week (sunday, monday, tuesday,
wednesday, thursday, friday and saturday) and then average them together to get the average daily
rainfall for the week (averageRainfall).
Which of the following statements about these two implementations is true?
Language B is ambiguous because the process of "average" is not explained well
The algorithm below simulates rolling a regular 6-sided die twice. Consider the goal of
determining if the sum of the values of the two rolls is odd or even.
Step 1: Using a random number generator, get a value between 1 - 6 inclusively Step 2:
Remember that number Step 3: Repeat steps 1 and 2 Step 4: Add the two remembered numbers
together Step 5: Multiply that sum by 10 Step 6: Divide the result of that multiplication by 2
What conclusions can be made with regard to what we are trying to determine? Select two
answers:
If the last digit of the value found in step 6 is 5, then the sum is odd
If the value found in step 6 is 10, 20, 30, 40, 50 or 60 then the sum is even
Which of the following should be true of any algorithm?
I. The order in which the steps making up the algorithm are followed is logically determined
, II. Following the instructions in the algorithm will always result in the same outputs, regardless
of any inputs
III. The instructions in the algorithm contain all necessary information to be implemented
1,3
Which of the following is the MOST important reason computers use artificial languages over
natural language?
The syntax of artificial languages is explicit and unambiguous
Which of the following best describes high-level computing languages?
They are not very ambiguous
A statistics teacher wishes to create a program on her calculator that generates a random even
integer. The command built in the calculator to generate a random positive integer is RANDOM(a,b). This
command generates a random integer between integers a and b (and including a and b). Which of the
following lines of code will ensure that the random integer generated will be even?
RANDOM(a,b) * 2
Which of the following describes the part of a computer which stores instructions and
information which has been input to the computer?
RAM
Which of the following best describes "compilation" in reference to computer science?
Code in a high-level language is converted to low-level instructions which can be interpreted and
run by the CPU.
A program that Thomas has written is complete. It has been tested thoroughly, and some
outputs were not as expected. Thomas is now going through the code carefully attempting to establish
the cause of these errors and change the code to remove them. What is this procedure called?
debugging
Understanding of the life cycle of a program is an essential component to becoming an effective
programmer. Which of the following is the best example of how the life cycle of a program should work?
Idea→algorithm→write code→execute code→debug→maintain
Jeremiah is part of a group planning a summer fair at which local businesses can run stalls and
events. He wants to use his programming skills to develop an app for the fair which businesses will be
able to use to communicate information about their activities at the fair with visitors. Which of the
following would be the best first step for Jeremiah to take?
Find out from the businesses and potential visitors what information and format they think
should be used for the app
Consider the following two implementations of the same algorithm, each written in a different
language.
Language A:Calculate the average daily rainfall for the week (averageRainfall) by adding together
the rainfall totals for each of the 7 days of the week (sun, mon, tue, wed, thu, fri, and sat) and dividing
the sum by 7.
, Language B:Take the total amount of rain from each day of the week (sunday, monday, tuesday,
wednesday, thursday, friday and saturday) and then average them together to get the average daily
rainfall for the week (averageRainfall).
Which of the following statements about these two implementations is true?
Language B is ambiguous because the process of "average" is not explained well
The algorithm below simulates rolling a regular 6-sided die twice. Consider the goal of
determining if the sum of the values of the two rolls is odd or even.
Step 1: Using a random number generator, get a value between 1 - 6 inclusively Step 2:
Remember that number Step 3: Repeat steps 1 and 2 Step 4: Add the two remembered numbers
together Step 5: Multiply that sum by 10 Step 6: Divide the result of that multiplication by 2
What conclusions can be made with regard to what we are trying to determine? Select two
answers:
If the last digit of the value found in step 6 is 5, then the sum is odd
If the value found in step 6 is 10, 20, 30, 40, 50 or 60 then the sum is even
Which of the following should be true of any algorithm?
I. The order in which the steps making up the algorithm are followed is logically determined
, II. Following the instructions in the algorithm will always result in the same outputs, regardless
of any inputs
III. The instructions in the algorithm contain all necessary information to be implemented
1,3
Which of the following is the MOST important reason computers use artificial languages over
natural language?
The syntax of artificial languages is explicit and unambiguous
Which of the following best describes high-level computing languages?
They are not very ambiguous
A statistics teacher wishes to create a program on her calculator that generates a random even
integer. The command built in the calculator to generate a random positive integer is RANDOM(a,b). This
command generates a random integer between integers a and b (and including a and b). Which of the
following lines of code will ensure that the random integer generated will be even?
RANDOM(a,b) * 2
Which of the following describes the part of a computer which stores instructions and
information which has been input to the computer?
RAM
Which of the following best describes "compilation" in reference to computer science?
Code in a high-level language is converted to low-level instructions which can be interpreted and
run by the CPU.
