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**Introduction to C Programming**

ET2560 Introduction to C Programming Introduction to C Programming Unit 1, Part 2 Unit 1 Presentations

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Flowchart Elements Unit 1: Algorithms

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Begin and End Shapes These shapes are used to begin and end a flowchart The beginning shape has the algorithm name as its label The end shape contains the word “End”

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**Rectangle Shape – Actions**

Rectangle has one entry and one exit The text in the rectangle is pseudo-code corresponding to one step in the algorithm

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**Diamond Shape – Decision Point**

One entry, two exits (one for “yes”, the other for “no”) Contains one question, with yes/no answer

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**Selection Shape Selection is an extension of the decision point**

Instead of a question, the diamond contains a value The value selects which branch to take One “other” branch is used for all other values that don’t have a branch

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**Connector Shape – On-page**

Use for a connection on same page Shape shows connection from one point to another Left shape can be used multiple times Right shape, used once, shows the destination of connection

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**Connector Shape – Off-page**

Use for a flowchart larger than one page Shape shows connection from one page to another Left shape can be used multiple times Right shape, used once, shows the destination of connection Visio automatically creates a new page when this shape used

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**Shapes Combine to Create Structures**

Straight-line structure Single-sided branch Double-sided branch Selection structure Until loop While loop Do-while loop

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**Straight-line Structure**

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Single-sided Branch

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Double-sided Branch

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**Selection Structure Selection structure is an extension of the branch**

All branches must converge together at the end

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“Do-While” Loop

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“While” Loop

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“Until” Loop

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Flowchart Examples Unit 1: Algorithms

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**Flowchart Example – Count to 9**

Here is an algorithm, in pseudo code, to output 1-9: Output “List of Numbers less than 10” Put 1 in number Output number Add 1 to number If number is less than 10, go back to step 3 End

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**Flowchart Created from Algorithm**

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**Flowchart Example – Odd #s < 10**

Output “List of Odd Numbers less than 10” Put 1 in number If number divided by 2 has remainder 0, go to step 5 Output number Add 1 to number If number is less than 10, go back to step 3 End

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**Flowchart for Odd Numbers < 10**

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