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Borland C++ Builder: The Complete Reference
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starting the debugging session, you can also use Trace Into to single-step through your program In addition to using the Run menu, the Step Over command can be activated by pressing F8 or by pressing Step Over on the toolbar, and the Trace Into command can be activated by pressing F7 or by pressing Trace Into on the toolbar You can also use Trace Into to begin the debugging session, but it creates a rather complicated window, containing a mix of assembly language and C++ code, as shown in Figure 30-1 To avoid this, start by using Step Over Also, since this is a console application, a console window opens upon starting the program Notice that the line containing the main( ) function declaration is highlighted This is where your program begins execution Note also that all the #include lines, the #pragma lines, and the sqr_it( ) s prototype are skipped over Statements that do not generate code, such as the preprocessor directives, obviously cannot be executed, so the debugger automatically skips them Variable declaration statements without initializers are also skipped when single-stepping, as they are not action statements that can be traced Press F7 several times Notice how the highlight moves from line to line Also notice that when the function sqr_it( ) is called, the highlight moves into the function and then returns from it The F7 key causes the execution of your program to be traced into function calls
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Figure 30-1
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Start of a debugging session activated by Trace Into
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Using C++ Builder s Integrated Debugging Environment
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There can be times when you only want to watch the performance of the code within one function, and not follow execution into any other functions To accomplish this, use the F8 (step over) key Each time this key is pressed, another statement is executed, but calls to functions are not traced Experiment with the F8 key at this time Notice that the highlight never enters the sqr_it( ) function Figure 30-2 shows the appearance of the edit window SpeedMenu It provides numerous debugging functions, including the ability to run the program to where the cursor is as well as to toggle breakpoints
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Breakpoints
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As useful as single-stepping is, it can be very tedious in a large program especially if the piece of code that you want to debug is deep in the program Instead of pressing F7 or F8 repeatedly to get to the section you want to debug, it is easier to set a breakpoint at the beginning of the critical section A breakpoint is, as the name implies, a break in the execution of your program When execution reaches the breakpoint, your program stops running before that line is executed Control returns to the debugger, allowing you to check the value of certain variables or to begin single-stepping the routine
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Figure 30-2
Edit window SpeedMenu
Borland C++ Builder: The Complete Reference
The C++ Builder debugger allows you to define the various different types of breakpoints shown here
Type
Source Address Data Breakpoint Module Load
Operation
Stops execution when a line in your source code is executed Stops execution when the machine instruction at a specified address is executed Stops execution when the data at a specified location is changed Stops execution when a specified dynamic link library (DLL) is loaded
Here we will examine only the source breakpoint, because it is the most important and frequently used (After understanding source breakpoints, you can easily explore the others on your own) There are two basic flavors of breakpoints: conditional and unconditional Each is examined next
Setting Unconditional Source Breakpoints
An unconditional source breakpoint always stops execution each time it is encountered There are several ways to add this type of breakpoint Position your cursor at the line where you want to place the breakpoint Then, you may do any of the following: I Press F5 I Select the Toggle breakpoint option in the Debug menu of the edit window s SpeedMenu I Click the left margin of the edit window at the line where you want to add a breakpoint The line of code at which the breakpoint is set is highlighted You can have several active breakpoints in a program Once you have defined one or more breakpoints, execute your program by choosing Run from the Run menu Your program runs until it encounters the first breakpoint As an example, set a breakpoint at the line
cout << n*n << " ";
inside sqr_it( ), and then run the program As you can see, execution stops at that line Figure 30-3 shows both the editor and Breakpoint List windows in the IDE You may select Breakpoints from the View | Debug Windows menu to obtain this display The
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