9618- Computer Science: Unit 13: Data Representation

13 Data Representation
13.1 User-defined data types

• Show understanding of why user-defined types are necessary
• Define and use non-composite types Including enumerated, pointer
• Define and use composite data types Including set, record and class/object
• Choose and design an appropriate user-defined data type for a given problem
  13.2 File organisation and access
• Show understanding of the methods of file organisation and select an appropriate method of file organisation and file access for a given problem
• Show understanding of methods of file access
• Show understanding of hashing algorithms
  13.3 Floating-point numbers, representation and manipulation
• Describe the format of binary floating-point real numbers
• Convert binary floating-point real numbers into denary and vice versa
• Normalise floating-point numbers
• Show understanding of the consequences of a binary representation only being an approximation to the real number it represents (in certain cases)
• Show understanding that binary representations can give rise to rounding errors