STRUCTURED CONTROL: BASIC CONTROL OPERATORS

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STRUCTURED CONTROL: BASIC CONTROL OPERATORS 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 1

Objectives Create a flowchart and pseudocode to describe a conditional program. Identify situations in which an IFTHENELSE control structure meets the design requirements. Identify situations in which a CASE control structure meets the design requirements. Identify situations in which a counter-controlled loop meets the design requirements. Identify situations in which a trailer-record loop meets the design requirements. Choose between a DOWHILE and a DOUNTIL control structure. 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 2

IFTHENELSE P? No Yes d c 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 3

Sequential IFTHENELSE P? No Yes c Q? No Yes d 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 4

Nested IFTHENELSE P? Yes No c Q? Yes No e d 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 5

CASE Code? A ProcA B ProcB C ProcC Other ProcOther 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 6

Op Code Problem (Flowchart) Start Read OP, N1, N2 OP? Result= N1+N2 Result= N1+N2 Result= N1+N2 Result= N1+N2 Result= 0 Write ‘Bad input’ Write Result, N1, N2, Op Stop 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 7

DOWHILE Loop e Q? 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 8

Counter-controlled Loop Count=x Count<x Count>0 No No Yes Yes DoStuff DoStuff Count= Count+1 Count= Count-1 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 9

Averaging Problem (Flowchart) 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 10

Header Record Logic 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 11

Averaging Problem with Header Record 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 12

Averaging Problem with No-Data Test 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 13

Reading a File - Counter DOWHILE Loop PSEUDOCODE Count = 0 DOWHILE Count < 3 Read a record Write a record Count = Count+1 ENDDO Count=0 Count = Count + 1 Count < 3? Yes Read a record Write a record No 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 14

Reading a File - Header DOWHILE Loop PSEUDOCODE Count = 0 DOWHILE Count >0 Read a record Write a record Count = Count-1 ENDDO Count=0 Count = Count - 1 Count >0 Yes Read a record Write a record No 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 15

Reading a File - Trailer DOWHILE Loop PSEUDOCODE Read a record DOWHILE Code Not 999 Write a record ENDDO Read a record Code NOT 999? Yes Write a record Read a record No 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 16

Reading a File – Auto EOF DOWHILE Loop PSEUDOCODE Read a record DOWHILE Not EOF Write a record ENDDO Read a record Not EOF? Yes Write a record Read a record No 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 17

DOUNTIL Loop Read File DoStuff Yes Done? No 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 18

Adding Six Numbers Using DOUNTIL (Flowchart) 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 19

Property -- Counter-Controlled (Flowchart) 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 20

Property - Header Record Logic (Structure Chart) 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 21

Property -- Header Record Logic -- Overall Control (Flowchart) 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 22

DOWHILE vs. DOUNTIL - No Initial Test 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 23

DOWHILE vs. DOUNTIL - Initial Test 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 24

Summary In this unit, you learned: How to design a program with conditional logic IFTHENELSE Nested IFTHENELSE Case statements How to design a program that includes loops Counter-controlled DOWHILE loop Trailer record DOWHILE loop DOUNTIL loop 11/29/2018© 2006 ITT Educational Services Inc. Structured Programming: Unit 2 Slide 25

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