copyright © 2012 pearson education, inc. chapter 2 beginning problem-solving concepts for the...
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Copyright © 2012 Pearson Education, Inc.
Chapter 2Beginning Problem-SolvingConcepts for the Computer
Problem Solving and Programming Concepts
9th Edition
By Maureen Sprankle and Jim Hubbard
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Overview
• Constants and Variables• Data Types• How the Computer Stores Data• Functions• Operators• Expressions and EquationsBullet, etc
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Figure 2.1 Important Concepts to Learn
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Table 2.1 Constants and Variables on the Computer
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Table 2.1 Constants and Variables on the Computer
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Rules for Naming and Using Variables
1. Name a variable according to what it represents.
2. Do not use spaces.
3. Start a variable name with a letter.
4. Do not use a dash or any other symbol that is used as a mathematical operator.
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Rules for Naming and Using Variables
5. Consistent usage of variable name.
6. Consistent use of upper, lowercase characters in variable names
7. Use naming convention specified by your company
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Table 2.2 Incorrect Variable Names
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Figure 2.2 Processing Data—How a Computer Balances a Checkbook
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Table 2.3 Data Types and Their Data Sets
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Table 2.4 Examples of Data Types
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Table 2.4 Examples of Data Types
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Table 2.5 Functions
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Table 2.5 Functions
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Table 2.5 Functions
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Table 2.5 Functions
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Table 2.6 Operators and Their Computer Symbols
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Table 2.6 Operators and Their Computer Symbols
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Table 2.7 Definitions of the Logical Operators
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Table 2.7 Definitions of the Logical Operators
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Table 2.7 Definitions of the Logical Operators
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Table 2.8 Hierarchy of Operations
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Table 2.8 Hierarchy of Operations
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Table 2.9 Expressions and Equations
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Evaluating a Mathematical Expression
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Evaluating a Relational Expression
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Evaluating a Logical Expression
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Evaluating an Equation That Uses Both Relational and Logical Operators
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Developing a Table of All PossibleResultants of a Logical Expression
• One unknown—A. • Two combinations: A can be either True or
False.
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Developing a Table of All PossibleResultants of a Logical Expression
• Two unknowns—A and B. • Four combinations: B can be either True or
False for each value of A..
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Developing a Table of All PossibleResultants of a Logical Expression
• Three unknowns—A, B, and C. • Eight combinations.
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Developing a Table of All PossibleResultants of a Logical Expression
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