Data Representation
IGCSE Computer Science (0478)
Data Representation
Introduction
Why computers use binary (how binary represents data)
Number system
Introduction
Number Conversions
Addition of Binary Numbers
Logical binary shifts (positive 8-bit integers)
Two’s Complement (Signed: Positive and Negative Numbers)
Use of the Hexadecimal System
Text, Sound and Image
Text, Sound and Images
File Types
Data storage and File compression
Measurement of the Size of Computer Memories
Lossless and Lossy File Compression
Data Representation
Number system
Introduction
Number Systems Binary System Uses only two digits: 0 and 1. Each digit shows whether a switch is OFF (0) or ON (1). The leftmost digit is called the ...
Number Conversions
Absolutely! Here’s a clear explanation that first covers the logic behind each type of conversion, then follows with examples. It’s simple, step-by-st...
Addition of Binary Numbers
Addition of Binary Numbers (Adding Two Positive 8-bit Numbers) Binary Addition Rules Bit 1 Bit 2 Carry Happens? (Carry Out = 1) Sum 0 0 ❌ No 0 ...
Logical binary shifts (positive 8-bit integers)
Logical Binary Shifts (Positive 8-bit Integers) Logical Left Shift (<< 1) What happens?Bits move one position to the left.A 0 is added on the ...
Two’s Complement (Signed: Positive and Negative Numbers)
Two’s Complement (Positive and Negative Numbers) What is Two’s Complement? Two’s complement is a way to represent signed numbers (both positive and n...
Use of the Hexadecimal System
Use of the Hexadecimal System What is Hexadecimal? Hexadecimal (or hex) is a base-16 number system. It uses 16 digits: 0 to 9 and A to F. A = 10, ...
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Why computers use binary (how binary represents data)
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