An attempt to run this program will result in a syntactic error message, as shown in Fig. 6.1. in .NET framework

Encoder QR Code in .NET framework An attempt to run this program will result in a syntactic error message, as shown in Fig. 6.1.

An attempt to run this program will result in a syntactic error message, as shown in Fig. 6.1.
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Fig. 6.1 A syntactic error message
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Compile error: Expected: list separator or )
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This message indicates the missing right parenthesis. Also, the command containing the error is highlighted in red within the Code Edit Window, as indicated in Fig. 6.2. (The highlighting is not apparent in Fig. 6.2 because of the inability to display colors.) When the missing right parenthesis is restored, the highlighting disappears and the program compiles normally.
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Fig. 6.2 The Code Edit Window, highlighting a statement containing a syntactic error
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6.2 LOGICAL ERRORS Errors may also occur during program execution. Many execution errors are caused by faulty program logic (e.g., dividing by zero or attempting to take the square root of a negative number). Hence, they are often referred to as logical errors. Some logical errors cause the program to crash during execution (i.e., the execution abruptly terminates and an error message is generated). Other logical errors allow the program to execute in a normal manner, but produce results that are incorrect. If a logical error results in a system crash, a message is produced indicating the reason for the crash, as shown in Fig. 6.3. Also, the location of the error is flagged within the Code Window, as shown in Fig. 6.4, if the Debug option is selected within the message box. (The offending statement is highlighted in yellow in Fig. 6.4. Also, the arrow in the left margin identifies the location of the error.)
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Fig. 6.3 A run-time error message Though the reason for the error (Overflow) is not immediately apparent, inspection of Figs. 6.3 and 6.4 suggests that the overflow condition is caused by a division by zero. This should provide the programmer with some insight into the cause of the errror. (In this case, the variable r is undefined; hence its value is zero. The denominator therefore has a value of zero, and the attempt to divide by zero results in an overflow.)
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Fig. 6.4 Logical errors that produce incorrect results without a system crash can be very difficult to find. However, the Visual Basic debugger contains features that can assist you in locating the source of the errors. These features include stepping through a program, one instruction at a time (so that you can look around after executing each instruction); setting breakpoints, which cause the execution of a program to be suspended; and defining watch values, which display the current values of specific variables or expressions. Visual Basic allows you to access its debugging features three different ways: via the Debug menu on the main menu bar, through certain function keys, or through the Debug toolbar, as illustrated in Fig. 6.5. (The Debug toolbar can be displayed by selecting Toolbars/Debug from the View menu.)
Start Break End Step Into Step Out Immediate Window Quick Watch
Step Over Toggle Breakpoint
Watch Window
Fig. 6.5 The Debug Toolbar The general strategy is to place a breakpoint near (preferably, slightly ahead of) the suspected source of error. Then execute the program in the normal fashion, until the breakpoint is encountered. Now define one or more watch values and step through the program, one instruction at a time. By observing the watch values as you step through the program, you can usually identify where the error is located. Once the location of the error is known, the source of the error can usually be identified.
6.3 SETTING BREAKPOINTS There are several different ways to set a breakpoint. The first step is to examine the program listing within the Code Editor Window and identify the statement where the break point will be located. Then select the statement, or simply click anywhere within the statement, and set the breakpoint in any of the following ways: 1. Select Toggle Breakpoint from the Debug menu. 2. Click on the Toggle Breakpoint button within the Debug toolbar (see Fig. 6.5). 3. On an Intel-based computer, press function key F9.
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