PROCEDURES in Visual Studio .NET

Drawer QR Code in Visual Studio .NET PROCEDURES

PROCEDURES
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[CHAP. 7
Read QR Code 2d Barcode In .NET Framework
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Determine the result of each of the following program segments. (a) Function Fix(Message As String) As String
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Fix = "'" + Message + "'" End Function . . . . . Message = "Hello, There!" Text = Fix(Message)
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(b) Function Square(y As Single) As Single
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Square = y ^ 2 + 2 * y + 3 End Function . . . . . x = 2 z = Square(x)
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Function Square(y As Single) As Single Square = y ^ 2 + 2 * y + 3 End Function . x z . . = = . . . . 2 Square(Square(x)) . . .
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(d) Function frm(a As Single, b As Single, c As Single, y As Single)As Single
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If (a < 2) Then Formula = a * y ^ 3 b * y + c / y Else Formula = a * y ^ 2 + b * y + c End If End Function . . . . . z = frm(3, 4, 5, 2) . . . . .
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Function Scramble(Message As String) As String Dim NewStr As String, c As String, i As Integer, n As Integer NewStr = "" n = Len(Message) For i = 1 To n c = Mid(Message, i, 1) NewStr = NewStr & Chr(Asc(c) + 1) Next i Scramble = NewStr End Function . . . . Message Message . . . . . = "Hello, There!" = Scramble(Message) .
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CHAP. 7]
PROCEDURES
Sub Change(Message As String) Dim a As String, b As String, n As Integer, i As Integer n = Len(Message) a = "" For i = 1 To n b = Mid(Message, i, 1) If (b >= "A" And b <= "Z") Then a = a + Lcase(b) ElseIf (b >= "a" And b <= "z") Then a = a + Ucase(b) Else a = a + b End If Next i Message = a End Sub
(g) Sub Sum(Total As Integer, n2 As Integer, Optional n1 As Integer = 1)
Dim i As Integer Total = 0 For i = n1 to n2 Total = Total + i Next i End Sub Dim First As Integer, Second As Integer, Total As Integer . . . . . Call Sum(Total, 6) First = Total . . . . . Sum Total, 6, 3 Second = Total
. . . . .
Rewrite the program shown in Example 7.3 so that it utilizes a function procedure rather than a sub procedure. Execute the program to verify that it is written correctly. Rewrite the program shown in Example 7.6 so that it utilizes a sub procedure rather than a function procedure to determine the factorial. Which type of procedure is best suited to this particular problem
Dim Str1 As String, Str2 As String, Str3 As String . . . . . Str1 = "1600 Pennsylvania Avenue NW, Washington, DC 20500" Call Change(Str1) Str2 = Str1 Call change(Str1) Str3 = Str1 . . . . .
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Programming Problems
Team-Fly
PROCEDURES
[CHAP. 7
Rewrite the program shown in Example 7.7 so that it utilizes the sub procedure written for Prob. 7.38. Execute the program to verify that it is written correctly. Modify the program shown in Example 7.10 (shooting craps) so that the function procedure
ThrowDice is replaced by a sub procedure.
Redesign the program shown in Example 7.10 so that a sequence of craps games will be simulated automatically and noninteractively. Enter the total number of games as an input quantity. Execute the program to simulate 1000 successive craps games. Use the results to estimate the probability of coming out ahead when playing multiple games of craps. (This value, expressed as a decimal, is the total number of wins divided by the total number of games played. If the probability exceeds 0.5, it favors the player; otherwise, it favors the house.) Modify each of the following examples presented in previous chapters so that it utilizes one or more programmer-defined sub or function procedures. (a) The piggy bank program shown in Example 4.5. (b) The multilingual hello program shown in Example 4.6. (c) The temperature conversion program shown in Example 4.7.
(d) The modified temperature conversion program shown in Example 4.8. (e) (f) The metronome program shown in Example 4.12. The geography program shown in Example 5.4.
(g) The modified multilingual hello program shown in Example 5.7. (h) The loan program shown in Example 6.2 (using the corrected version of the code). (i) 7.43 The program to determine the real roots of a quadratic equation shown in Example 6.3.
Write a complete Visual Basic program for each of the following problems that were originally described in earlier chapters. Include one or more sub procedures and/or function procedures in each program. (a) Enter a positive integer and determine whether it is even or odd, and whether or not it is a prime number (see Prob. 4.46). (b) Calculate the arithmetic average of a list of n numbers (see Prob. 4.49). (c) Determine the capital of a country, or select a capital and determine the corresponding country (see Prob. 4.51).
(d) Convert between U.S. and foreign currencies (see Prob. 4.52). (e) Calculate the amount of money that accumulates in a savings account after n years (see Prob. 4.55). Repeat Prob. 7.43(e) using the single, generalized compound interest formula discussed in Prob. 5.43.
CHAP. 7]
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