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1 st Semester 2005 1 Module4-1 Iteration statement - while อภิรักษ์ จันทร์สร้าง Aphirak Jansang aphirak.j@ku.ac.th http://www.cpe.ku.ac.th/~aphirak Computer Engineering Department Kasetsart University, Bangkok THAILAND
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1 st Semester 2005 2/39 Outline Review condition statement Loop statements while statement do…while statement for statement break statement
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1 st Semester 2005 3/39 Simple C# Structure Namespace Class Main()Namespace Class Main() Variable & Constant Location statements WriteLine, ReadLine, if, switch, Loop Review condition statement
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1 st Semester 2005 4/39 Condition Statements condition if (condition) statement; condition if (condition) statement1; else statement2; ( ) switch ( ) { case : ; break; default: ; break; } Review condition statement
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1 st Semester 2005 5/39 Outline Review condition statement Loop statements while statement do…while statement for statement break statement
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1 st Semester 2005 6/39 Loop or Iteration in C# for while do…while foreach Iteration Loop statements
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1 st Semester 2005 7/39 C# Program with Condition Start statement1 statement2 statement3statement4 End Condition true false Loop statements
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1 st Semester 2005 8/39 Simple C# Program Start statement1 End statement1 Loop statements
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1 st Semester 2005 9/39 Simple C# Program with Loop Start x=5; statement1 x=x-1; End x>0 true false Loop statements
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1 st Semester 2005 10/39 Outline Review condition statement Loop statements while statement do…while statement for statement break statement
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1 st Semester 2005 11/39 while statement condition statement true false while (condition) statement; while statement
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1 st Semester 2005 12/39 while statement – more statements while (condition) { statement1; statement2; } condition statement1 true false statement2 while statement
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1 st Semester 2005 13/39 Example1: while statement 2 n = ??? n = 5 result=2*2*2*2*2 = 32 result=2*2*2*2*2 = 32 result=1; result = result*2; n=n-1; n>0 true false n=5; Display result See demo program!!!! prog2-loop.cs while statement
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1 st Semester 2005 14/39 Example2: while statement n = 5 result = 1+2+3+4+5 result = 1+2+3+4+5 result=0; result = result+n; n=n-1; n>0 true false n=5; Display result See demo program!!!! prog3-loop.cs while statement
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1 st Semester 2005 15/39 Iteration Template Counter Controlled Sentinel Controlled while statement
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1 st Semester 2005 16/39 Counter Controlled Control Variable – counter variable Three component Initial counter variable condition (counter variable is still valid?) Incrementing/Decrementing counter variable while statement: counter controlled
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1 st Semester 2005 17/39 Example3: Count Controlled Display 1 – 7 on screen initial counter statement; dec||inc counter condition true false See demo program!!!! prog4-loop.cs while statement: counter controlled
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1 st Semester 2005 18/39 Break!!!! (5 minutes) (Elevator) Neo: There is no spoon... there's a difference between knowing the path and walking the path... Morpheus: Neo, sooner or later you're going to realize, just as I did, there's a difference between knowing the path and walking the path... Trinity: Run, Neo. Run! What is he doing? Morpheus: He's beginning to believe * From The Matrix
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1 st Semester 2005 19/39 Iteration Template Counter Controlled Sentinel Controlled while statement
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1 st Semester 2005 20/39 Sentinel Controlled Input driven program #repetition cannot tell depend on condition and input Sentinel Value Causes loop to break while statement: sentinel controlled
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1 st Semester 2005 21/39 Example4: Sentinel Controlled Find summation from user input Exit program when user input negative number See demo program!!!! prog5-loop.cs while statement: sentinel controlled
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1 st Semester 2005 22/39 Break 3 Minutes “With great power comes with great responsibility” *From Spiderman
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1 st Semester 2005 23/39 Example 5: Display n stars See demo program!!!! prog6-loop.cs while statement: example
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1 st Semester 2005 24/39 Example 6: Display stars See demo!!!! prog7-loop.cs while statement: example
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1 st Semester 2005 25/39 Example 7: Display stars See demo!!!! prog8-loop.cs while statement: example
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1 st Semester 2005 26/39 Example 8: Display stars See demo!!!! prog9-loop.cs while statement: example
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1 st Semester 2005 27/39 Summary Loop statements while statement do…while statement for statement break statement
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