Repetition in Visual Basic .NET

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53 Repetition
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Return rawInput End Function End Class Sub Main() Dim avg As New Averager() avgCalcAverage() End Sub End Module Listing 523: A class to calculate the average of a list of inputs
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In the Averager class, only the CalcAverage() method has been made public, since the other methods are only for use within the class Note how dividing up the functionality of the class in this way makes it easier to understand what is going on, since each method performs a simple task that is easy to describe (GetAnInput() gets a valid input from the user, GetInputs() collects input data until the user has entered all the values, and CalcAverage() calculates the average of a list of input values)
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Exercise 54
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The factorial of a number is de ned as the product of every integer from 1 up to that number eg the factorial of 3 (written as 3!) can be calculated as 1 2 3 = 6 Computer programs often use an elegant form of algorithm known as a recursive algorithm to calculate factorials However, it is possible to calculate the factorial of a number using a DoLoop Write code that will calculate the factorial of a number N, assuming the number is more than zero b) Write code that will display each character of a string on a separate line of the console: you can use the Chars() property to determine the character at any position (Chars(0) is the rst character, etc), and the Length() method to determine how many characters are to be displayed
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5314 WhileEnd While
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Visual Basic provides other ways of repeating a section of code One is the classic While loop, which was initially proposed as the natural structure for repetition in structured programming This has the form shown in Listing 524
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While <some condition> End While Listing 524: A While loop
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As it turns out, this exerts exactly the same form of control as a Do WhileLoop structure, and has really just been included to keep programmers who are used to that form of the structure happy Since the DoLoop structure does everything that a WhileEnd While loop can and more, I nd it easier just to stick with the DoLoop form
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5 n Controlling Program Code
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532 De nite Loops
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DoLoops and WhileEnd While loops are Visual Basic s versions of inde nite loops (loops which depend on an exit condition that may or may not occur) However, for years before Do loops and While loops were available in programming languages, BASIC programmers were able to create de nite loops using the ForNext structure This form of loop structure makes use of a control variable that it uses to keep count of the number of iterations The simplest form is the one shown in Listing 525 For index = 1 To 10 'Code to repeat Next index Listing 525: A ForNext loop
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In this loop structure, the loop control variable (index) is initially set to the rst value in the range given after the = operator At the end of each pass through the enclosed code (at the keyword Next) the control variable is incremented (normally by 1) When the control variable is incremented, if it exceeds the last value in the range, the loop is nished and control passes to the statement after the loop In short, the loop repeats as the control variable counts through the speci ed range Since the range the control variable is to count through is given at the outset, we can always work out how many iterations will occur, and so this is a de nite loop It does not, however, mean that the range to count through needs to be xed
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Dim index As Integer Dim start As Integer, finish As Integer ConsoleWrite("Enter the start of the range:") start = ConsoleReadLine() ConsoleWrite("Enter the end of the range:") finish = ConsoleReadLine() For index = start To finish ConsoleWrite(" {0} ", index) Next index ConsoleWriteLine() Listing 526: Using variables to determine the range of a ForNext loop
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In Listing 526, the ForNext loop counts through the range start to finish, although the values of these are not known at the time the program was written Since the user supplies them, the programmer has no way of knowing how many iterations the loop will perform However, the number of iterations that will be made is known immediately before the loop executes (it is finish start + 1); well, almost An Exit For statement can be used to break out of a ForNext loop at any point, eg Listing 527
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