OCR H446/01 Computer systems · 1.4.1

Data Types

Revision notes for OCR A Level Computer Science (H446) 1.4.1 Data Types.

Revision notes

• a.Primitive data types: integer, real/floating point, character, string and Boolean
• b.Represent positive integers in binary
• c.Sign and magnitude and two's complement to represent negative numbers
• d.Addition and subtraction of binary integers
• e.Represent positive integers in hexadecimal
• f.Convert positive integers between binary, hexadecimal and denary
• g.Representation and normalisation of floating point numbers in binary
• h.Floating point arithmetic: addition and subtraction
• i.Bitwise manipulation and masks: shifts, combining with AND, OR and XOR
• j.How character sets (ASCII and UNICODE) are used to represent text