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Creating Flowcharts © 2012 Project Lead The Way, Inc.Principles Of Engineering
Definition A flowchart is a schematic representation of an algorithm or a process.
Parts of a Flowchart Start/end Process Input/output Decision Arrows Display
Start/End Shape is a rounded rectangle Start is required of all flow charts Some flow charts may not have an END
Process Shape is rectangular Process involves the action or the “verb” part of the flowchart Examples include –Add 1 –Turn the motor on –Turn the light off –Rotate the part
Input/Output Shape is a parallelogram Indicates that manual operation is needed Examples include –Type in the weight –Check the balance –Time the operation
Decision Shape is a rhombus Outcome is either yes or no Examples include –Is this number larger than 10? –Does the weight meet specifications? –Has the count been reached?
Arrows Arrows indicate the flow of the chart. Arrows are drawn from the output of one block to the input of another. Only one arrow can represent outputs. Multiple arrows may represent inputs.
Example Count from 1 to 9 by odd numbers. Before attempting to draw the flowchart, determine what you want the output to be. What is the first block (always)?
Step 1 The output will be 1, 3, 5, 7, 9. The Start block is always first. START
Step 2 The program begins with the number 1. START INPUT 1
Step 4 Now that there is a number, the program will state the number. START INPUT 1 SAY NUMBER
Step 3 The number 2 will be added to 1 so that the program will continue to count by odd numbers. START INPUT 1 ADD 2 SAY NUMBER
Step 4 Add a decision block so that the program will continue counting until the value is greater than 9. NO Is number >9? START INPUT 1 ADD 2 SAY NUMBER
Step 5 Once the number is greater than 9, the program ends. END NO YES Is number >9? START INPUT 1 ADD 2 SAY NUMBER
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