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Using C++ Builder s Integrated Debugging Environment
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Figure 30-3
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The Breakpoint List window
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Breakpoint List window lists all of the breakpoints and also indicates which of these was the last encountered There are several ways to remove a breakpoint You may do any one of the following: I Press F5 I Select the Toggle breakpoint option in the Debug menu of the edit window s SpeedMenu I Highlight a breakpoint entry in the Breakpoint List window and then press the DEL key
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A conditional source breakpoint allows you to specify the conditions under which a breakpoint stops execution and the actions that occur when it does Let s look at an example, using the program from the preceding section To add a conditional source breakpoint, position your cursor in the editor window at the line where you want to establish the breakpoint For example, position it in the main( ) function at the line where the sqr_it( ) function is called Choose Source Breakpoint from the Run | Add Breakpoint menu This action causes the dialog box shown in Figure 30-4 to appear
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Add Source Breakpoint dialog box
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Now click Advanced in the lower-right corner of this dialog box This activates the dialog box shown in Figure 30-5 Sometimes you will want to establish a breakpoint so that it stops execution only after a specified number of iterations through a loop This threshold is defined by setting the Pass Count field equal to the number of iterations that you wish to ignore For this example, enter 4
Figure 30-5
Advanced Add Source Breakpoint dialog box
30:
Using C++ Builder s Integrated Debugging Environment
To see the conditional breakpoint in action, choose Run in the Run menu The program begins execution and the breakpoint does not take effect until the sqr_it( ) function has been executed three times and is ready to begin its fourth call, at which point it stops on the breakpoint
Watching Variables
While debugging, you commonly need to see the value of one or more variables as your program executes Using C++ Builder s debugger, this is easily accomplished There are two methods for watching variables The first is very quick and just shows the value of a variable; the second method involves using watches To quickly see the value of a variable, simply move the mouse cursor over the variable name in the edit window Let the mouse cursor sit on the variable for just a few seconds and a little window will pop up showing the current value of the variable in question The preferred method of watching variables is by using the Watch List Window First, activate the Watch List window by selecting Watches from the View | Debug Windows menu To add a watch, first activate the Add Watch dialog box Here are two ways you may do this I Press CTRL-F5 I Right-click in the Watch List window and select Add Watch from the SpeedMenu Once the Watch Properties dialog box is displayed, enter the name of the variable you want to watch The debugger automatically displays the value of the variable in the Watches window as the program executes If the variable is global, its value is always available However, if the variable is local, its value is reported only when the function containing that variable is being executed When execution moves to a different function, the variable s value is unknown Keep in mind that if two functions both use the same name for a variable, the value displayed relates to the function currently executing As an example, activate the Watch Properties dialog box and enter i If you are not currently running the program or if execution has been stopped inside the sqr_it( ) function, you will first see the message i: [process not accessible]' However, when execution is inside the main( ) function, the value of i is displayed Figure 30-6 shows the appearance of the editor, part of the console window, and the Watch List window when execution is suspended at a breakpoint Notice that the editor window indicates the location of the breakpoints and the Watch List window indicates the value of any watched variables You are not limited to watching only the contents of variables You can watch any valid C/C++ expression involving variables However, the expression cannot use any #define values or variables that are not in the scope of the function that is being executed
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