A-level Computer Science

• What is an integer?

  A whole number without decimal parts
• What is the purpose of a boolean data type?

  To represent logical expressions
• How do real numbers differ from integers?

  Reals can contain fractions, integers cannot
• Why do we use integers in programming?

  To represent whole quantities without fractions
• What values can a boolean data type store?

  True or False
• Why are real numbers important in representation?

  They represent values that are not whole numbers
• Can a character data type store more than one character at a time?

  No, it stores only one character
• What boolean value does the statement "18 > 16" have?

  True
• What types of symbols can be considered characters?

  Letters, numbers, and special symbols
• How does the integer data type differ from floating-point data types?

  Integers are whole numbers, floating-point includes decimals
• What are the five primitive data types mentioned?

  Integer, real, boolean, character, string
• What is the purpose of each primitive data type?

  Each type serves specific data purposes
• What is a height measurement that is a real number?

  1.75 meters
• What type of information does a string store?

  Text information
• What types of numbers can integers be?

  Positive, negative, or zero
• How does a string differ from a character?

  A string can contain multiple characters
• What is a character in programming?

  A single letter, number, or symbol
• How does a boolean data type differ from other data types?

  It only stores two specific values
• How do real numbers differ from integers?

  Reals include decimals
• How does a character data type differ from integers?

  Characters store one character, integers store whole numbers
• Why is "Hello, world!" classified as a string?

  It is an ordered sequence of characters
• What is the description of the integer data type?

  Whole numbers
• How can integers be used in real life?

  To represent quantities like age or score
• What is a boolean data type used for?

  True or False values
• Compare and contrast the different primitive data types.

  • Integer: Whole numbers (e.g., 18)
  • Real: Numbers with decimals (e.g., 19.99)
  • Boolean: True/False values (e.g., True)
  • Character: Single letters/symbols (e.g., 'A')
  • String: Ordered sequence of characters (e.g., "Hello")
• Why is it important to differentiate between character data types and integers?

  They represent different types of data
• What is a real or floating-point number?

  A number that can have a decimal part
• What does the character 'X' represent?

  The letter X
• What does the character data type store?

  Single letters or symbols
• What is the main distinction between a string and a character?

  A string holds multiple characters, a character holds one
• What is a string in programming?

  An ordered sequence of characters
• What does SDLC stand for?

  Systems Development Life Cycle
• What is the first step in the analysis stage?

  Identifying user groups
• What are all the phases in the System Development Life Cycle in order?

  • Planning
  • Analysis
  • Design
  • Development
  • Testing
  • Implementation
  • Maintenance
• What is the main activity in the development phase of SDLC?

  Building the software
• What occurs during the design phase of SDLC?

  Creating system structure
• What is the purpose of the testing phase in SDLC?

  Checking for bugs
• How does the SDLC promote continuous improvement?

  It restarts with planning after maintenance
• What is assessed during the Evaluation Stage?

  Software performance and necessary improvements
• What phase comes after the Design phase in the System Development Life Cycle?

  Development