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Visual C#® 2012: How to Program, Fifth Edition by Harvey Deitel, Paul Deitel

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Summary

Section 17.1 Introduction

• Files are used for long-term retention of large amounts of data.

• Data stored in files often is called persistent data.

• Computers store files on secondary storage devices.

Section 17.2 Data Hierarchy

• All data items that computers process are reduced to combinations of 0s and 1s.

• The smallest data item that computers support is called a bit and can assume the value 0 or 1.

• Digits, letters and special symbols are referred to as characters. The set of all characters used to write programs and represent data items on a particular computer is that computer’s character set.

• Bytes are composed of eight bits

• C# uses the Unicode character set.

• A field is a group of characters that conveys meaning. ...

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