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Introduction to Flowcharts
Mrs. Lauren Taylor | Dardanelle High School | Computer Science Principles
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History Flowcharts were introduced by Frank Gilberth in 1921 and were called Process Flow Charts Used to train business people – quickest way to complete a job or task Became a popular took to describe computer algorithms
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Computer Algorithms Instance of Logic
Effective for the intended target computers to produce output from given input Optimal algorithms produce faster results
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Friendship Algorithm
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Flowchart Symbols Decision Start / End Process Input/Output Arrows
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Oval Start / End Called a “Terminator”
Usually contains the word “Start” or “End” Begins and ends each flowchart process path Start / End
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Arrows Connects the symbols in your flowchart
Guides the reader through the sequence of process steps Flow moves in the direction of the arrows Arrows
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Process Rectangle Used when you have only one possible next step
One arrow leaving this step Indicates internal operation inside the processor or memory Process
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Diamond Asks a question that can be answered in binary format (Yes/No or True/False) Arrows representing different decisions emerge from different points Requires a choice by the reader Decision
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Parallelogram or Rhombus
Standard input/output symbol Represents material or information entering or leaving the system Customer Order (input) or a product (output) Obtain data or output results Input/Output
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Example Which shapes are the start and end points?
What is the process in this example? How many times is there a decision? When does the process end?
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Practice Create a flowchart that finds the sum of 513 and 232
Think in terms of a calculator and the process it uses to calculate the sum of two numbers
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Start A = 513 B = 232 Display Sum = 745 End Calculate Sum as A + B
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