Unit 13: Data Representation

13.1 User-defined data types

1 Show understanding of why user-defined types are necessary

2 Define and use non-composite types

3 Define and use composite data types

4 Choose and design an appropriate user-defined data type for a given problem

13.2 File organisation and access

1 Show understanding of the methods of file organisation and select an appropriate method of file organisation and file access for a given problem

2 Show understanding of methods of file access

3 Show understanding of hashing algorithms

13.3 Floating-point numbers, representation and manipulation

1 Describe the format of binary floating-point real numbers

2 Convert binary floating-point real numbers into denary and vice versa

3 Normalise floating-point numbers

4 Show understanding of the consequences of a binary representation only being an approximation to the real number it represents (in certain cases)

5 Show understanding that binary representations can give rise to rounding errors