Algorithm Error Identification Quiz

An algorithm to withdraw money from an ATM lacks a step to ask for the user's PIN before dispensing cash. Input: Card inserted Output: Select amount of money Dispense money What is the error?

• Missing step

• Infinite loop

• Unclear output

• Redundant step

A sorting algorithm for a list of numbers keeps comparing the same numbers repeatedly, even though they are already sorted. Compare two numbers Swap if needed Repeat from step 1 What is the error?

• Redundant step

• Unclear input

• Infinite loop

• Missing output

An algorithm is supposed to calculate the average grade of students in a class but doesn't include how to divide the total score by the number of students. Input: List of student grades Sum all grades Output: Total score What is the error?

• Missing step

• Redundant step

• Infinite loop

• Unclear instructions

A recipe algorithm for making pancakes starts with heating the pan but doesn't say when to add the ingredients. Heat the pan Cook until golden brown Serve What is the error?

• Infinite loop

• Redundant step

• Missing step

• Unclear output

A robot navigation algorithm instructs the robot to move forward but doesn't specify when to stop. Input: Move forward Repeat step 1 What is the error?

• Redundant step

• Infinite loop

• Missing input

• Unclear output

An algorithm designed to calculate the square of a number doesn’t specify how the number is input. Multiply the number by itself Output the result What is the error?

• Missing step

• Unclear input

• Redundant step

• Infinite loop

An algorithm designed to sort a list of names begins by sorting the first two names but stops without completing the rest of the list. Compare first two names Swap if necessary Output sorted list What is the error?

• Redundant step

• Infinite loop

• Missing step

• Unclear output

An algorithm to print a multiplication table starts by printing numbers but doesn't specify how to stop or end the output. Input: Number Print result of multiplication Repeat What is the error?

• Missing input

• Redundant step

• Unclear output

• Infinite loop

An algorithm for calculating the total cost of items in a shopping cart includes a step where the same item is added twice. Input: List of items and prices Add item to total Add item to total again Output: Total cost What is the error?

• Infinite loop

• Redundant step

• Missing step

• Unclear instructions

An algorithm for turning off the lights in a building starts by cutting the electricity but doesn’t include steps to check which lights are still on. Turn off power Output: Lights off What is the error?

• Unclear input

• Missing step

• Redundant step

• Infinite loop