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Encodings — Class 11 ISC Computer Science revision notes

A 3-page visual revision sheet for Encodings, written for Class 11 ISC Computer Science. Formulas, diagrams and the traps that cost marks, laid out to be read the night before rather than the term before. Free, and it opens inside CapCompass.

What this Encodings sheet covers

• A fixed width forces a choice
• Three ways to write a negative number
• Sign magnitude
• 1's complement
• 2's complement
• What n bits can hold
• unsigned
• Write -5 in 8 bit 2's complement
• Real numbers: mantissa and exponent
• Single against double precision
• Single, 32 bits
• Double, 64 bits
• Why it matters
• The catch
• Operations the paper asks about
• Characters are numbers with a lookup agreed in advance
• ASCII against Unicode
• ASCII
• Unicode
• Terms to use exactly
• Why sign magnitude lost
• Traps that cost marks
• Tricks that save time

Open the full Encodings sheet →Free, works offline, no account needed. All 3 pages, plus a study plan built around your own exam dates.

How CapCompass uses this sheet

These notes are not a standalone PDF. CapCompass plans Computer Science chapter by chapter against your real exam dates and free hours, and when the plan reaches Encodings the sheet opens inside the study block itself — at the page covering the sub-topic that block is on, with the timer still running. Revision arrives at the moment the plan says revise, instead of having to be gone looking for.

More Computer Science Class 11 revision notes

• Arrays and Strings
• Basic Input Output and File Handling
• Implementation of Algorithms
• Introduction to Object Oriented Programming using Java
• Methods and Constructors
• Numbers
• Objects and Classes
• Packages
• Primitive Values, Wrapper Classes and Types
• Propositional Logic and Hardware Implementation
• Recursion
• Statements and Scope
• Trends in Computing and Ethical Issues
• Variables and Expressions