CS: Algorithms and Flowcharts Worksheet

Question 1

Write an algorithm with at least 5 steps for making a peanut butter and jelly sandwich. Use clear, numbered steps.

Accepted Answer

A correct algorithm should list the steps in order, such as getting two slices of bread, spreading peanut butter on one slice, spreading jelly on the other slice, putting the slices together, and placing the sandwich on a plate.

Question 2

A flowchart starts with Start, then says Input age, then uses a decision diamond labeled age >= 13. If yes, it says Allow account. If no, it says Ask for parent permission. What does the decision diamond do?

Accepted Answer

The decision diamond checks whether the age is greater than or equal to 13 and chooses the next path based on whether the condition is true or false.

Question 3

Put these algorithm steps in the correct order: A. Pour cereal into a bowl. B. Eat the cereal. C. Get a bowl. D. Add milk.

Accepted Answer

The correct order is C, A, D, B. You get a bowl, pour cereal into it, add milk, and then eat the cereal.

Question 4

Trace this algorithm: Set score = 0. Add 5 to score. Add 3 to score. If score > 6, subtract 2 from score. What is the final value of score?

Accepted Answer

The final value of score is 6. The score becomes 5, then 8, and because 8 is greater than 6, 2 is subtracted to make 6.

Question 5

In a flowchart, what shape is usually used for Start and End, and what shape is usually used for a process step such as total = total + 1?

Accepted Answer

Start and End are usually shown with an oval. A process step such as total = total + 1 is usually shown with a rectangle.

Question 6

Write a short algorithm that decides whether a number is even or odd. Your algorithm should include an input step, a decision step, and an output step.

Accepted Answer

A correct algorithm could say to input a number, check whether the number divides by 2 with no remainder, output that the number is even if it does, and output that the number is odd if it does not.

Question 7

A flowchart asks, Is the password correct? The yes path goes to Log in. The no path goes to Try again. What type of programming structure is this: sequence, selection, or repetition?

Accepted Answer

This is selection because the algorithm makes a choice between two different paths based on a condition.

Question 8

Trace this loop: Set count = 1. While count <= 4, print count and then add 1 to count. What numbers are printed?

Accepted Answer

The numbers printed are 1, 2, 3, and 4. The loop stops when count becomes 5 because 5 is not less than or equal to 4.

Question 9

A student writes this algorithm for brushing teeth: 1. Put toothpaste on brush. 2. Wet toothbrush. 3. Get toothbrush. 4. Brush teeth. Explain what is wrong and how to fix it.

Accepted Answer

The steps are out of order because the student needs to get the toothbrush before putting toothpaste on it or wetting it. A better order is get toothbrush, wet toothbrush, put toothpaste on brush, and brush teeth.

Question 10

Write the flowchart steps in words for this process: Start -> Input temperature -> If temperature >= 100 then Output Boiling, else Output Not boiling -> End.

Accepted Answer

The flowchart starts by taking a temperature as input. It checks whether the temperature is at least 100. If it is, it outputs Boiling, and if it is not, it outputs Not boiling, then the flowchart ends.

Question 11

An algorithm has these steps: Set total = 0. For each number in 2, 4, 6, add the number to total. Output total. What does the algorithm output?

Accepted Answer

The algorithm outputs 12. It adds 2, 4, and 6 to the total, so 0 + 2 + 4 + 6 equals 12.

Question 12

Create a simple algorithm for a game character that has 3 lives. Each time the character hits an obstacle, it loses 1 life. The algorithm should repeat until lives = 0, then output Game over.

Accepted Answer

A correct algorithm could say to set lives to 3, repeat while lives is greater than 0, check for an obstacle, subtract 1 life if an obstacle is hit, and when lives equals 0 output Game over.

CS: Algorithms and Flowcharts

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