Binary, Text and Graphics Representation
Explain positive binary integers, floating point, extended ASCII, vector objects and bitmapped images.
How to study National 5 Computing Science
Move from functional requirements to designs and implementation, trace data and code carefully, and support testing and evaluation with evidence.
Core concepts
Concept 1
Positive integers can be converted between binary and denary using place values.
Exam cue: Write binary place values and show the contributing powers of two.
Concept 2
Positive real values use floating-point mantissa and exponent components; extended ASCII uses eight bits per character.
Exam cue: Keep vector object attributes distinct from bitmap pixel data.
Concept 3
Vector graphics store objects and attributes; bitmapped graphics store a grid of pixels.
Risk pitfalls and guardrails
Applying negative-number representations outside the National 5 requirement.
Guardrail: Check option route, data type, valid boundary, loop condition, array index, identifier and expected output before committing to the response.
Describing a vector image as a grid of pixels.
Guardrail: Check option route, data type, valid boundary, loop condition, array index, identifier and expected output before committing to the response.
Memory anchors
Positive binary integer
Use powers-of-two place values to represent a non-negative whole number.
Floating point
A mantissa holds significant digits and an exponent determines scale.
Extended ASCII
An eight-bit code represents each character.
Vector object
A rectangle, ellipse, line or polygon is stored with coordinates and style attributes.
Vector attributes
Required attributes include coordinates, fill colour and line colour where relevant.
Bitmap
A graphic is stored as a grid of pixels, each with a colour value.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
What denary value is binary 1010?
What is denary 13 in binary?
Answer all questions to submit.
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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