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Cs3310
Chapter 1
An Introduction to Computer Science

INVITATION TO
Computer Science

1

Objectives
After studying this chapter, students will be able to:
• Understand the definition of computer science
• Write down everyday algorithms and evaluate them to determine if they are ambiguous or not effectively computable Invitation to Computer Science, 6th Edition

2

Objectives (continued)
After studying this chapter, students will be able to:
• Understand the roots of modern computer science in mathematics thousands of years old and in mechanical machines hundreds of years old
• Summarize the key points in the historical development of modern electronic computers
• Map the organization of the text onto the definition of computer science

Invitation to Computer Science, 6th Edition

3

Introduction
• Misconceptions
– Computer science is:
• The study of computers
• The study of how to write computer programs
• The study of the uses and applications of computers and software

Invitation to Computer Science, 6th Edition

4

The Definition of Computer Science
• Computer science is the study of algorithms, including: –
–
–
–

Their formal and mathematical properties
Their hardware realizations
Their linguistic realizations
Their applications

Invitation to Computer Science, 6th Edition

5

The Definition of Computer Science
(continued)
• Algorithm
– Informally, “an ordered sequence of instructions that is guaranteed to solve a specific problem.”

• Operations used to construct algorithms
– Sequential operations
– Conditional operations
– Iterative operations

Invitation to Computer Science, 6th Edition

6

Invitation to Computer Science, 6th Edition

7

Invitation to Computer Science, 6th Edition

8

The Definition of Computer Science
(continued)
• Why are formal algorithms so important in computer science?
– If we can specify an algorithm to solve a problem, then we can automate
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