But how do they store the data they hold? This free course, Representing and manipulating data in computers, will help you to understand how the data in a computer represents something in the outside world. You will also explore how ASCII code and Unicode are used to control data.

Course learning outcomes

After studying this course, you should be able to:

• Understand what all the terms highlighted in bold in the text mean
• Understand how the following types of data are represented in a computer, and what the limitations of such representations are: positive and negative integers; fractions; analogue physical quantities such as weight; true/false quantities; still pictures; text; moving pictures; sound
• Understand at an introductory level what data compression is and why it is useful
• Understand at an introductory level how input and output subsystems support the conversion of various types of information to and from data types usable by a computer
• Describe what a computer program is and how it utilises the memory and the processor.