May 19, 2015 1 Algorithm and Control Diversion Handle Binary Fork Multiple Choice Iterative /loop CS220 Introduction to Computer Science Algorithm

April 18, 20231

Algorithm and Control Diversion Handle Binary Fork Multiple Choice Iterative /loop

CS220 Introduction to Computer ScienceCS220 Introduction to Computer ScienceAlgorithm and ControlAlgorithm and Control

Software and Computer Science at APUSoftware and Computer Science at APUBasic Flow of Control and Statements Basic Flow of Control and Statements

Azusa Pacific University, Azusa, CA 91702, Tel: (800) 825-5278 Department of Computer Science, http://www.apu.edu/clas/computerscience/

http://www.apu.edu/clas/computerscience/




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Algorithm and Control Daily Routine Algorithm







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Decision Evaluation C++ allows to evaluate conditions in order to do different operations (decision)

Evaluate

Decision Making



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Decision Evaluation

You can test for a condition being true or false, for various values of an expression.



C++ allows to evaluate conditions in order to do different operations (decision)

AND OR Not

&& || !

Both true--> T Either true -->T True --> F

Equal == not equal != non-zero

Logic

Logic

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Algorithm and flow of control Diversion Handle Binary Fork Multiple Choice Iterative / Loop








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Diversion Handle

Walking

Barking

Calm down

Yes, Scared

No

Walking;if (dog barking ) { be more careful keep watching out

}Continue to walk

Sometimes we have to be interrupted by some sudden event, and after we handle it and continue. Obviously, this is the case with If-statement







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Diversion Handle an example In Visual GUI Check Box, we will decide to offer discount or not, just depends on the checked status

‘ After Calculate Button is clicked, following will be done

int quantity = Int.Parse(QTextBox.Text);double = double.Parse(PTextBox.Text);double extPrice;double disc15Single = 0.0; // Initializedouble finalPrice;

extPriceSingle = quantityInteger * priceSingle;if (DiscountCheckBox.Checked) { disc15Single = 0.15 * extPriceSingle;} finalPrice = extPriceSingle - disc15Single;

ETextBox.Text = extPriceSingle.ToString("C")DTextBox.Text = disc15Single.ToString("C")FTextBox.Text = finalPrice.ToString("C")

if (discountCheckBox.Checked) { … }


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Algorithm and Control Diversion Evaluation Binary Fork Multiple Choice Iterative / Loop








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Life is uncertain Binary Fork Facing a fork, you have to choose either, then merge and continue your work

Seeking

L/R

turn right

RightLeft

turn left







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Through Check Box, we will decide to offer discount or not, just depends on the checked status

If discountCheckBox.Checked Then


‘ After Calculate Button is clicked, following will be done

int quantity = Int.Parse(QTextBox.Text);double = double.Parse(PTextBox.Text);double extPrice, disc15Single, finalPrice;

extPriceSingle = quantityInteger * priceSingle;if (DiscountCheckBox.Checked) { disc15Single = 0.15 * extPriceSingle;}else { disc15Single = 0.0; }finalPrice = extPriceSingle - disc15Single;

ETextBox.Text = extPriceSingle.ToString("C")DTextBox.Text = disc15Single.ToString("C")FTextBox.Text = finalPrice.ToString("C")

Life is uncertain Binary Fork

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Algorithm and Control Diversion Handle Binary Fork Multiple Choice Iterative / Loop








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Facing a multi-choice, you have to choose one from many, then merge and continue your work

Seeking

LCR

turn right

RightLeft

turn left straight

Central



Multi-Choice Grading Scale





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Multi-Choice Grading Scale switch and if statement can help us to decide the grading for students’ exam scale

int score; char yourGrade; … … if (score >= 90) yourGrade = ‘A’; else if (score >=80) yourGrade = ‘B’; else if (score >=70) yourGrade = ‘C’; else if (score >=60) yourGrade = ‘D’; else yourGrade = ‘F’ ;

April 18, 2023



int score;char yourGrade; … …switch (yourGrade) { case ‘A’: score is 90+

case ‘B’: score is 80+

case ‘C’: score is 70+

case ‘D’: score is 60+

default: score is below 60 }





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Algorithm and Control Diversion Handle Binary Fork Multiple Choice Iterative / Loop








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Algorithm and Control Daily Routine Algorithm



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For / Loop statement Basic concept about loop a loop or iterative control structure stands for life long process.

for (fclass; class continues; nclass) { Goto class;}



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while / loop statement Basic concept about loop

First class;while (class continues) { Goto class; Next class;}



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do while / loop statement Basic concept about loop

first class;do { goto class; next class;} while (class continues)



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while statement guards first while statement

Do Until pass_is_valid keep_tryingLoop

Do While Pass_is_valid keep_doingLoop

Arrogant Securitywhile (check first) {

keep_doing_something

}

Check it first

SSS: Strict to be safe & securedWWW: Too strict to have a try



Other new forms

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do while statement Check-out last in do-while statement

Do keep_tryingLoop Until Satisfied

Do keep_enjoyingLoop While Want

Warm Waitress do {

keep_doing_something

} while (no check) Check it last

SSS: loose enough to have try WWW: Too loose to be safe & secured



Other new forms

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That is all

Thank you very much!

Questions?



Documents

May 19, 2015 1 Algorithm and Control Diversion Handle Binary Fork Multiple Choice Iterative /loop CS220 Introduction to Computer Science Algorithm