Flowcharting Continued

1
FlowchartingContinued
2
Four Flowchart Structures

• Sequence
• Decision (TODAY)
• Repetition (LATER)
• Case (TODAY)

3
Review

• What do each of the following symbols represent?

(Answer on next slide)
4
Answer

• What do each of the following symbols represent?

Terminal
Input/Output Operation
Process
5
Decision Structure

• One of two possible actions is taken, depending
  on a condition.

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Decision Structure

• A new symbol, the diamond, indicates a yes/no
  question. If the answer to the question is yes,
  the flow follows one path. If the answer is no,
  the flow follows another path

7
Decision Structure

• In the flowchart segment below, the question is
  x lt y? is asked. If the answer is no, then
  process A is performed. If the answer is yes,
  then process B is performed.

8
Decision Structure

• The flowchart segment below shows how a decision
  structure is expressed.

Flowchart
is x lt y?
9
Decision Structure

• The flowchart segment below shows a decision
  structure with only one action to perform. It is
  expressed with only one process.

Flowchart
10
Case Structure

• One of several possible actions is taken,
  depending on the contents of a variable.

11
Case Structure

• The structure below indicates actions to perform
  depending on the value in yearsEmployed.

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Case Structure
If yearsEmployed 1 bonus is set to 200
If yearsEmployed 2, bonus is set to 400
If yearsEmployed is any other value, bonus is set
to 800
If yearsEmployed 0, bonus is set to 0
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Module - Subprograms

• A program module (such as a procedure or
  function) is represented by a special symbol.

14
Modules

• The position of the module symbol indicates the
  point the module is executed.
• A separate flowchart MUST be constructed for the
  module.
• The module flowchart will have the subprogram
  name in the START terminal instead of START

15
Review

• What do each of the following symbols represent?

(Answer on next slide)
16
Answer

• What do each of the following symbols represent?

Decision
Terminal
Input/Output Operation
Connector
Module
Process
17
Review

• Name the four flowchart structures.

(Answer on next slide)
18
Answer

• Sequence
• Decision
• Repetition
• Case

19
Review

• What type of structure is this?

(Answer on next slide)
20
Answer

• Sequence

21
Review

• What type of structure is this?

(Answer on next slide)
22
Answer

• Case

23
Review

• What type of structure is this?

(Answer on next slide)
24
Answer

• Decision