how to generate barcode in asp.net using c# Fig. 6.10 The Edit Watch dialog box in Visual Studio .NET

Paint Denso QR Bar Code in Visual Studio .NET Fig. 6.10 The Edit Watch dialog box

Fig. 6.10 The Edit Watch dialog box
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Now suppose your program has executed up to a breakpoint, and you would like to know the current value of a variable or expression that has not been previously defined as a watch value. This can easily be accomplished by highlighting the variable or expression, and then calling upon Visual Basic s Quick Watch feature. To access quick watch, do any of the following: 1. Select Quick Watch... from the Debug menu. 2. Press function keys Shift-F9 simultaneously. 3. Click on the Quick Watch button within the Debug toolbar (see Fig. 6.5). The current value of the selected variable or expression will then appear within the Quick Watch dialog box, as shown in Fig. 6.11. Once the Quick Watch dialog box is displayed, it must be removed before stepping can be initiated. Thus, quick watch values are not updated as you step through the program. However, you can convert a quick watch variable or expression to an ordinary watch value by clicking on the Add button within the Quick Watch dialog box (see Fig. 6.11).
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Fig. 6.11 The Quick Watch dialog box Another way to determine the current value of a variable or expression at a break point is to enter the variable/expression into the Immediate window. To do so, type a question mark ( ), followed by the variable or expression. The current value will then be displayed immediately. For example, to determine the value of the variable r at a break point (after r has been assigned a value), simply type
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into the Immediate window. The current value will then be displayed within the Immediate window, as shown in Fig. 6.12.
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Fig. 6.12 The Immediate window The Immediate window is usually displayed automatically within the Visual Basic environment (note the lower left corner of Figs. 6.7 or 6.9). If it is not present, however, it may be displayed in any of the following ways: 1. Select Immediate Window from the View menu. 2. Press function keys Ctrl+G simultaneously. 3. Click on the Immediate Window button within the Debug toolbar.
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Note that immediate values, like quick watch values, are not updated as you progress through the program on a step-by-step basis. The Immediate window remains visible, however, showing the value of the variable or expression when the variable/expression was last typed into the Immediate window. 6.5 STEPPING THROUGH A PROGRAM The line-by-line stepping can be initiated either from the beginning of the program or from a breakpoint. There are actually three different types of stepping: Step Into, Step Over, and Step Out. Each is discussed below. 1. Step Into results in line-by-line stepping within the current procedure, and any subordinate procedures that are accessed by the current procedure (see Chap. 7 for more information about procedures). This is the most common choice for simple programs. 2. Step Over results in line-by-line stepping within the current procedure, but it bypasses stepping through any subordinate procedures that are accessed along the way (see Chap. 7). The subordinate procedures are executed, however, so that any final values resulting from the subordinate procedures are in effect as the stepping continues beyond the procedure access. Step Over may be selected instead of Step Into if a subordinate procedure is very lengthy (e.g., includes loops), or is believed to produce no useful debugging information. 3. Step Out results in execution of all remaining statements within the current procedure, and then pauses at the first statement following the procedure access in the parent routine. To carry out the actual line-by-line (statement-by-statement) stepping, do any of the following for each desired step: 1. Select Step Into (or Step Over, Step Out) from the Debug menu. 2. Press function key F8 to Step Into (or Shift+F8 to Step Over, Ctrl+Shift+F8 to Step Out). 3. Click on the Step Into button (or the Step Over or Step Out button) on the Debug toolbar (see Fig. 6.5). Whenever a step is taken, the statement to be executed next will be highlighted within the Code Edit window, with a right-pointing arrow in the left margin, as shown in Fig. 6.9. EXAMPLE 6.2 STEPPING THROUGH A PROGRAM
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Suppose we wish to determine the monthly cost of a loan, given the amount of the loan, the annual interest rate (expressed as a percentage), and the length of the loan (i.e., the number of months to repay the loan). Calculations of this type are used to determine the cost of car loans, home mortgages, etc. To do so, we must evaluate the formula A=P r (1 + r ) n (1 + r ) n 1
where A = the amount of each monthly payment P = the amount of money originally borrowed (i.e., the principal) r = the monthly interest rate, expressed as a decimal n = the number of monthly payments to repay the loan (i.e., the length of the loan) The monthly interest rate, r, is determined from the annual interest rate, i, as r = 0.01i / 12 Note that this equation involves both a conversion from an annual interest rate to a monthly interest rate (hence, the division by 12), and a conversion from a percentage to a decimal value (hence, the factor 0.01). The formula can be simplified somewhat by writing A = P r f / ( f 1)
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