Desiging Algorithms Quiz

Emilie is writing a program and needs to decide between different paths based on user input. What is the control structure that allows decisions to be made between alternative paths?

• Sequence.

• Iteration.

• Selection.

• Subroutines.

Answer explanation

The correct choice is 'Selection' because it refers to control structures that allow a program to choose between different paths based on conditions, enabling decision-making based on user input.

During a coding class, Ishaan asked the instructor about the most commonly used form of repetition. The instructor replied:

• pre-test iteration.

• post-test iteration.

• iteration.

• none of the above.

Answer explanation

The term 'iteration' refers to the general concept of repetition in programming. It encompasses both pre-test and post-test iterations, making it the most commonly used form of repetition in coding.

Ishaan and Emilie are learning about different methods of representing algorithms. They come across a method where keywords are used in pairs. Which method are they learning about?

• Flowcharts.

• Context diagrams.

• Pseudocode.

• No other option is correct.

Answer explanation

Ishaan and Emilie are learning about pseudocode, which uses keywords in pairs to represent algorithms in a structured way. This method allows for clear and concise expression of logic, making it easier to understand algorithms.

Emilie is creating a flowchart for her computer science project. Which shape should she use to represent input and output?

• Rectangles.

• Diamonds.

• Squares.

• Parallelograms.

Answer explanation

In flowcharts, parallelograms are used to represent input and output operations. This distinguishes them from rectangles, which denote processes, and diamonds, which indicate decision points.

Luke and Ishaan are deciding between two different routes to school. When using binary selection, how many alternatives are there?

• One.

• Two.

• Eight.

• Sixteen.

Answer explanation

In binary selection, each choice has two options. Luke and Ishaan can choose between two different routes to school, making the total number of alternatives two.

Ishaan is writing a program to automate his daily tasks. What determines the order in which statements within his algorithm are executed?

• Subroutines.

• Control structures.

• Parameters.

• Variables.

Answer explanation

Control structures, such as loops and conditionals, dictate the flow of execution in an algorithm. They determine the order in which statements are executed, making them essential for automating tasks.

Cie and Liam are Software Engineering students who have been given the task of representing the same algorithm using two different methods. Which two common methods for doing this, are examined in this course?

• NS diagrams and structured English.

• Pascal and Cobol.

• Context diagrams and decision trees.

• Pseudocode and flowcharts.

Answer explanation

Pseudocode and flowcharts are common methods for representing algorithms. Pseudocode provides a high-level description using structured language, while flowcharts visually depict the algorithm's flow, making them effective for understanding and communication.

During a coding class, Ishaan asked about post-test loops. What are they also known as?

• counting loops.

• guarded loops.

• unguarded loops.

• no other option is correct.

Answer explanation

Post-test loops are also known as unguarded loops because they execute the loop body at least once before checking the condition. This distinguishes them from other loop types that may not execute at all if the condition is false initially.

Ollie is creating a flowchart for his project. Which shape should he use to represent decisions?

• Diamonds.

• Squares.

• Rectangles.

• Circles.

Answer explanation

In flowcharts, decisions are represented by diamonds. This shape indicates a branching point where a yes/no question is asked, leading to different paths based on the answer.

In a cooking class, what is the control structure that ensures that each step of a recipe is followed in the correct order?

• Iteration.

• Sequence.

• Selection.

• Pre-test iteration.

Answer explanation

The control structure that ensures each step of a recipe is followed in the correct order is called Sequence. It dictates that actions are performed one after another, which is essential in cooking to achieve the desired outcome.