Part I in Visual Studio .NET

Drawer PDF417 in Visual Studio .NET Part I

Part I
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Introducing Microsoft Visual C# and Microsoft Visual Studio 2008
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The break and continue Statements
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In 4, you saw the break statement being used to jump out of a switch statement. You can also use a break statement to jump out of the body of an iteration statement. When you break out of a loop, the loop exits immediately and execution continues at the rst statement after the loop. Neither the update nor the continuation condition of the loop is rerun. In contrast, the continue statement causes the program to perform the next iteration of the loop immediately (after reevaluating the Boolean expression). Here s another version of the example that writes the values 0 through 9 to the console, this time using break and continue statements:
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int i = 0; while (true) { Console.WriteLine( continue + i); i++; if (i < 10) continue; else break; }
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This code is absolutely ghastly. Many programming guidelines recommend using continue cautiously or not at all because it is often associated with hard-to-understand code. The behavior of continue is also quite subtle. For example, if you execute a continue statement from inside a for statement, the update part runs before performing the next iteration of the loop. In the following exercise, you will write a do statement to convert a positive whole number to its string representation in octal notation.
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Examine a do statement
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1. Using Visual Studio 2008, open the DoStatement project, located in the \Microsoft Press\Visual CSharp Step by Step\ 5\DoStatement folder in your Documents folder. 2. On the Debug menu, click Start Without Debugging. The application displays a form that has two text boxes and a button called Show Steps. When you type a positive integer (the program doesn t work with negative integers) in the upper text box and click Show Steps, the program takes the number that you have typed in and converts it to a string representing the octal (base 8) value of the same
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Using Compound Assignment and Iteration Statements
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number. The program uses a well-known algorithm that repeatedly divides a number by 8, calculating the remainder at each stage. The lower text box shows the steps used to build this octal presentation. 3. Type 2693 in the upper text box, and then click Show Steps. The lower text box displays the steps used to create the octal representation of 2693 (5205):
4. Close the window to return to the Visual Studio 2008 programming environment. 5. Display the code for Window1.xaml.cs in the Code and Text Editor window. 6. Locate the showStepsClick method. This method runs when the user clicks the Show Steps button on the form. This method contains the following statements:
int amount = int.Parse(number.Text); steps.Text = ; string current = ; do { int nextDigit = amount % 8; int digitCode = 0 + nextDigit; char digit = Convert.ToChar(digitCode); current = digit + current; steps.Text += current + \n ; amount /= 8; } while (amount != 0);
The rst statement converts the string value in the Text property of the number text box into an int using the Parse method of the int type:
int amount = int.Parse(number.Text);
Part I
Introducing Microsoft Visual C# and Microsoft Visual Studio 2008
The second statement clears the text displayed in the lower text box (called steps) by setting its Text property to the empty string:
steps.Text = ;
The third statement declares a string variable called current and initializes it to the empty string:
string current = ;
The real work in this method is performed by the do statement, which begins at the fourth statement:
do { ... } while (amount != 0);
The algorithm repeatedly performs integer arithmetic to divide the amount variable by 8 and determine the remainder; the remainder after each successive division constitutes the next digit in the string being built. Eventually, when amount is reduced to 0, the loop nishes. Notice that the body must run at least once. This behavior is exactly what is required because even the number 0 has one octal digit. Look more closely at the code, and you will see that the rst statement inside the do loop is this:
int nextDigit = amount % 8;
This statement declares an int variable called nextDigit and initializes it to the remainder after dividing the value in amount by 8. This will be a number somewhere between 0 and 7. The next statement is this:
int digitCode = 0 + nextDigit;
This statement requires a little explanation! Characters have a unique code according to the character set used by the operating system. In the character sets frequently used by the Microsoft Windows operating system, the code for character 0 has integer value 48. The code for character 1 is 49, the code for character 2 is 50, and so on up to the code for character 9 , which has integer value 57. C# allows you to treat a character as an integer and perform arithmetic on it, but when you do so, C# uses the character s code as the value. So the expression 0 + nextDigit will actually result in a value somewhere between 48 and 55 (remember that nextDigit will be between 0 and 7), corresponding to the code for the equivalent octal digit. The third statement inside the do loop is
char digit = Convert.ToChar(digitCode);
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