AQA GCSE Algorithms

Sequence is when...

• ...instructions are executed one after another

• instructions are executed one after another in a series

• instructions are executed by the user

• instructions are executed one after another but not always in series

Selection is when...

• ...a program will execute instructions regardless of what the user does

• ...a program will execute certain instructions based on the user's actions

• ...a program will execute certain instructions based on conditions

• ....a program will execute all instructions regardless of what the user does

Selection statements include...

• IF, THEN, ELSE & CASE

• IF, ELSE, & CASE

• IF, THAN, ELSE & CASE

• IF, THEN, ELSE, ELIF & CASE

In computer programming 'iteration' is used to...

• ... loop around and around a piece of code until the correct answer is chosen

• ...loop around a piece of code until a condition is met that activates the next part of the program

• ...loop around and around a piece of code until a condition is met that ends the iteration

• ...loop twice around a piece of code until a condition is met that ends the iteration

Logic errors in programs are...

• ...errors in program statements that mean the outcome is unexpected, even though the program will run

• ...errors in the algorithm that means the outcome is expected, even though the program will run

• ...errors in the algorithm that means the outcome is unexpected, even though the program will run

• ...errors in the algorithm that means the outcome returns nothing as the program will not run

What is the main difference between a constant and a variable?

• A constant's value remains the same whereas a variable's value can change

• A constant's value only changes if a variable's value changes

• A constant's value remains the same whereas a variable's value can be changed by the user

• A constant's value remains the same whereas a variable's value can be changed, but only once

A string is a data type that typically takes up 1 byte per character. Which of the following is a string?

• hello world

• "!£llo world4"

• "hello world

• hello world"

Which of these is not a sorting algorithm?

• Bubble

• Insertion

• Merge

• Binary

Which sorting algorithm is described by: moving through a list repeatedly, swapping elements that are in the wrong order.

• Merge

• Bubble

• Insertion

• None of these

Which sorting algorithm is described by: split a list into individual lists, then combine these, two lists at a time.

• Bubble

• Merge

• Insertion

• None of these