AQA GCSE Computer Science - 3.1.1 Representing Algorithms

what are the three constructs used to write algorithms in pseudocode

• sequence, selection, iteration
• beginning , middle, end
• name, option, variable
• userinput, total, option

What is a selection

• using an if else or then statement
• a variable
• a choice
• a menu

what is a sequence

• writing steps in the order they need to happen
• list of numbers
• boolean variables
• a list

what is a definite iteration

• uses a for loop so you can execute a task a number of times
• control, alt, delete
• flowchart element
• input or output

what is a indefinite iteration

• using a until loop
• all other while statements don’t work in the code
• something that is not definite
• waste of time

what is a condition contolled loop

• a while or endwhile loop
• a loop that is contolled
• a placebo loop
• a loop that is not based on conditions

what does a while loop do

• a while loop allows code to be executedbased on a given Boolean condition
• loops
• repeats once and ends
• never ends

what is an if statement

• performs a set of instructions if it is true
• a statement with an if
• a side comment
• only pseudocode

whats an else statement

• performs a set of insttructions if the previous statement is false
• a statement with an else
• only pseudocode
• a side comment

whats an elif statement

• an elif statment lets you check if multiple expressions are true
• a side comment
• a statement with an elif
• only pseudocde