Computer Science: A Structured Programming Approach Using C1 5-2 Two-Way Selection The decision is described to the computer as a conditional statement.

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Presentation transcript:

Computer Science: A Structured Programming Approach Using C1 5-2 Two-Way Selection The decision is described to the computer as a conditional statement that can be answered either true or false. If the answer is true, one or more action statements are executed. If the answer is false, then a different action or set of actions is executed. if…else and Null else Statement Nested if Statements and Dangling else Problem Simplifying if Statements Conditional Expressions Topics discussed in this section:

Computer Science: A Structured Programming Approach Using C2 FIGURE 5-6 Two-way Decision Logic

Computer Science: A Structured Programming Approach Using C3 FIGURE 5-7 if...else Logic Flow

Computer Science: A Structured Programming Approach Using C4 Table 5-2Syntactical Rules for if…else Statements

Computer Science: A Structured Programming Approach Using C5 FIGURE 5-8 A Simple if...else Statement

Computer Science: A Structured Programming Approach Using C6 FIGURE 5-9 Compound Statements in an if...else

Computer Science: A Structured Programming Approach Using C7 FIGURE 5-10 Complemented if...else Statements

Computer Science: A Structured Programming Approach Using C8 FIGURE 5-11 A Null else Statement

Computer Science: A Structured Programming Approach Using C9 FIGURE 5-12 A Null if Statement

Computer Science: A Structured Programming Approach Using C10 PROGRAM 5-3Two-way Selection

Computer Science: A Structured Programming Approach Using C11 PROGRAM 5-3Two-way Selection

Computer Science: A Structured Programming Approach Using C12 FIGURE 5-13 Nested if Statements

Computer Science: A Structured Programming Approach Using C13 PROGRAM 5-4Nested if Statements

Computer Science: A Structured Programming Approach Using C14 PROGRAM 5-4Nested if Statements

Computer Science: A Structured Programming Approach Using C15 else is always paired with the most recent unpaired if. Note

Computer Science: A Structured Programming Approach Using C16 FIGURE 5-14 Dangling else

Computer Science: A Structured Programming Approach Using C17 FIGURE 5-15 Dangling else Solution

Computer Science: A Structured Programming Approach Using C18 Table 5-3Simplifying the Condition

Computer Science: A Structured Programming Approach Using C19 FIGURE 5-16 Conditional Expression

Computer Science: A Structured Programming Approach Using C20 Table 5-4Examples of Marginal Tax Rates

Computer Science: A Structured Programming Approach Using C21 FIGURE 5-17 Design for Calculate Taxes

Computer Science: A Structured Programming Approach Using C22 FIGURE 5-18 Design for Program 5-5 (Part I)

Computer Science: A Structured Programming Approach Using C23 FIGURE 5-18 Design for Program 5-5 (Part II)

Computer Science: A Structured Programming Approach Using C24 FIGURE 5-18 Design for Program 5-5 (Part III)

Computer Science: A Structured Programming Approach Using C25 PROGRAM 5-5Calculate Taxes

Computer Science: A Structured Programming Approach Using C26 PROGRAM 5-5Calculate Taxes

Computer Science: A Structured Programming Approach Using C27 PROGRAM 5-5Calculate Taxes

Computer Science: A Structured Programming Approach Using C28 PROGRAM 5-5Calculate Taxes

Computer Science: A Structured Programming Approach Using C29 PROGRAM 5-5Calculate Taxes

Computer Science: A Structured Programming Approach Using C30 PROGRAM 5-5Calculate Taxes

Computer Science: A Structured Programming Approach Using C31 PROGRAM 5-5Calculate Taxes

Computer Science: A Structured Programming Approach Using C32 PROGRAM 5-5Calculate Taxes

Computer Science: A Structured Programming Approach Using C33 PROGRAM 5-5Calculate Taxes

Computer Science: A Structured Programming Approach Using C34 PROGRAM 5-5Calculate Taxes