What Is Debug For Mac



Congratulations, you have completed the Excel 2011 tutorial that explains how to debug in the VBA environment in Microsoft Excel 2011 for Mac.

Tutorial Summary

Excel 2011 is a version of Excel developed by Microsoft that runs on the Windows platform.

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In this Excel 2011 tutorial, we covered the following:

  • What is the VBA debugging environment?
  • How to set a breakpoint
  • How to clear a breakpoint
  • How to clear all breakpoints
  • Debug mode in VBA
  • How to check values in VBA
  • How to use the Immediate Window
  • How to move through the code
  • Step Into
  • Step Over
  • Continue
  • Halt

Each version of Excel can 'look and feel' completely different from another. As such, we recommend that you try one of our other Excel tutorials to become familiar with the Excel version that you will be using.

Other Excel Tutorials

Now that you have learned about the VBA debugging environment in Excel 2011, learn more.

Try one of our other Excel tutorials:

Excel 2016 Tutorials

Excel 2013 Tutorials

Excel 2011 for Mac Tutorials

Excel 2010 Tutorials

Excel 2007 Tutorials

Excel 2003 Tutorials

There is still more to learn!

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This tutorial introduces the debugging tools available in Visual Studio for Mac.

Prerequisites

  • This tutorial works with the console app that you create in Create a .NET Core console application using Visual Studio for Mac.
Debugformat

Use Debug build configuration

Debug and Release are Visual Studio's built-in build configurations. You use the Debug build configuration for debugging and the Release configuration for the final release distribution.

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In the Debug configuration, a program compiles with full symbolic debug information and no optimization. Optimization complicates debugging, because the relationship between source code and generated instructions is more complex. The release configuration of a program has no symbolic debug information and is fully optimized.

By default, Visual Studio for Mac uses the Debug build configuration, so you don't need to change it before debugging.

  1. Start Visual Studio for Mac.

  2. Open the project that you created in Create a .NET Core console application using Visual Studio for Mac.

    The current build configuration is shown on the toolbar. The following toolbar image shows that Visual Studio is configured to compile the Debug version of the app:

Set a breakpoint

A breakpoint temporarily interrupts the execution of the application before the line with the breakpoint is executed.

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  1. Set a breakpoint on the line that displays the name, date, and time. To do that, place the cursor in the line of code and press (command+). Another way to set a breakpoint is by selecting Run > Toggle Breakpoint from the menu.

    Visual Studio indicates the line on which the breakpoint is set by highlighting it and displaying a red dot in the left margin.

  2. Press (command+enter) to start the program in debugging mode. Another way to start debugging is by choosing Run > Start Debugging from the menu.

  3. Enter a string in the terminal window when the program prompts for a name, and then press enter.

  4. Program execution stops when it reaches the breakpoint, before the Console.WriteLine method executes.

Mac

Use the Immediate window

The Immediate window lets you interact with the application you're debugging. You can interactively change the value of variables to see how it affects your program.

  1. If the Immediate window is not visible, display it by choosing View > Debug Pads > Immediate.

  2. Enter name = 'Gracie' in the Immediate window and press enter.

  3. Enter date = date.AddDays(1) in the Immediate window and press enter.

    The Immediate window displays the new value of the string variable and the properties of the DateTime value.

    The Locals window displays the values of variables that are defined in the currently executing method. The values of the variables that you just changed are updated in the Locals window.

  4. Press (command+enter) to continue debugging.

    The values displayed in the terminal correspond to the changes you made in the Immediate window.

    If you don't see the Terminal, select Terminal - HelloWorld in the bottom navigation bar.

  5. Press any key to exit the program.

  6. Close the terminal window.

Set a conditional breakpoint

The program displays a string that the user enters. What happens if the user doesn't enter anything? You can test this with a useful debugging feature called a conditional breakpoint.

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  1. ctrl-click on the red dot that represents the breakpoint. In the context menu, select Edit Breakpoint.

  2. In the Edit Breakpoint dialog, enter the following code in the field that follows And the following condition is true, and select Apply.

    Each time the breakpoint is hit, the debugger calls the String.IsNullOrEmpty(name) method, and it breaks on this line only if the method call returns true.

    Instead of a conditional expression, you can specify a hit count, which interrupts program execution before a statement is executed a specified number of times.

  3. Press (command+enter) to start debugging.

  4. In the terminal window, press enter when prompted to enter your name.

    Because the condition you specified (name is either null or String.Empty) has been satisfied, program execution stops when it reaches the breakpoint.

  5. Select the Locals window, which shows the values of variables that are local to the currently executing method. In this case, Main is the currently executing method. Observe that the value of the name variable is ', that is, String.Empty.

  6. You can also see that the value is an empty string by entering the name variable name in the Immediate window and pressing enter.

  7. Press (command+enter) to continue debugging.

  8. In the terminal window, press any key to exit the program.

  9. Close the terminal window.

  10. Clear the breakpoint by clicking on the red dot in the left margin of the code window. Another way to clear a breakpoint is by choosing Run > Toggle Breakpoint while the line of code is selected.

Step through a program

Visual Studio also allows you to step line by line through a program and monitor its execution. Ordinarily, you'd set a breakpoint and follow program flow through a small part of your program code. Since this program is small, you can step through the entire program.

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  1. Set a breakpoint on the curly brace that marks the start of the Main method (press command+).

  2. Press (command+enter) to start debugging.

    Visual Studio stops on the line with the breakpoint.

  3. Press I (shift+command+I) or select Run > Step Into to advance one line.

    Visual Studio highlights and displays an arrow beside the next line of execution.

    At this point, the Locals window shows that the args array is empty, and name and date have default values. In addition, Visual Studio has opened a blank terminal.

  4. Press I (shift+command+I).

    Visual Studio highlights the statement that includes the name variable assignment. The Locals window shows that name is null, and the terminal displays the string 'What is your name?'.

  5. Respond to the prompt by entering a string in the console window and pressing enter.

  6. Press I (shift+command+I).

    Visual Studio highlights the statement that includes the date variable assignment. The Locals window shows the value returned by the call to the Console.ReadLine method. The terminal displays the string you entered at the prompt.

  7. Press I (shift+command+I).

    The Locals window shows the value of the date variable after the assignment from the DateTime.Now property. The terminal is unchanged.

  8. Press I (shift+command+I).

    Visual Studio calls the Console.WriteLine(String, Object, Object) method. The terminal displays the formatted string.

  9. Press U (shift+command+U) or select Run > Step Out.

    The terminal displays a message and waits for you to press a key.

  10. Press any key to exit the program.

Use Release build configuration

Once you've tested the Debug version of your application, you should also compile and test the Release version. The Release version incorporates compiler optimizations that can negatively affect the behavior of an application. For example, compiler optimizations that are designed to improve performance can create race conditions in multithreaded applications.

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To build and test the Release version of the console application, do the following steps:

  1. Change the build configuration on the toolbar from Debug to Release.

  2. Press (option+command+enter) to run without debugging.

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Next steps

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In this tutorial, you used Visual Studio debugging tools. In the next tutorial, you publish a deployable version of the app.