Organising and manipulating data using data structures

Question 1

Explain the difference between an array and a record. Include reference to data type.

Answer 1

An array can hold elements which could be any one of a variety of data types. Each element is indexed uniquely by an integer, usually starting at 0.

A record consists of a number of fields which may have different data types within the one record.

Question 2

When is a data dictionary useful for programming? Explain how you would convince someone who thinks the programming language will keep track of variable names and datatypes.

Answer 2

Data dictionaries are essential for code modification, providing clarity on variables and arrays. They require regular updates during development to reflect design changes.

Question 3

What is a data dictionary?

Answer 3

A reference guide outlining the structure, format, types, and relationships of data elements within a database or program. It assists developers in code modification and understanding intricate data structures.