Programming
What's covered
Key facts
In AQA pseudo-code the keyword for integer division is DIV.
Authentication identifies who you are; authorisation decides what you are allowed to do.
age >= 18 AND has_ticket is true only when both conditions hold.
The ASCII code of the character '1' is 49, not the integer 1.
A comment is a note added to code to explain its purpose; it is ignored by the computer when the program runs.
The five data types named on the AQA 8525 spec are integer, real, Boolean, character and string.
A format check tests that data matches an expected pattern, e.g. UK postcode LL1 1LL.
Anticipating misuse means a programmer thinks about how a user could accidentally or deliberately cause a program to fail, and writes code to prevent harm.
FOR i ← 1 TO 5 (inclusive both ends) runs the loop body five times.
In AQA pseudo-code, OUTPUT writes a value or string to the screen.
Sample questions
A taste of the 271 questions in this topic, answers marked. Sign up to practise the full set with spaced repetition.
What is the value of 10 DIV 3?
- •One (the result minus two)
- •Ten (the dividend value itself)
- ✓Three (the integer part only)
- •Zero (no integer part at all)
What is the most common form of authentication?
- •A handshake captured by the computer's camera
- •A signature signed on a physical form
- ✓A username and password combination
- •A weekly emailed code sent to the user
When does an AND expression return true?
- •When at least one operand is true
- ✓When both operands are true
- •When neither operand is true at all
- •When the operands are different in value
What does ASCII let us do with characters?
- •Compress characters to reduce file size
- •Display characters in different fonts and sizes
- •Encrypt characters for secure transmission
- ✓Represent characters as numbers
Why are subroutines used when structuring a program?
- •To convert the code into binary faster
- •To make the program run more quickly
- ✓To split it into smaller reusable parts
- •To stop users entering invalid data
Name the five common AQA data types.
- •Integer, float, Boolean, array, string
- •Integer, real, binary, character, string
- •Integer, real, Boolean, character, record
- ✓Integer, real, Boolean, character, string
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