How To Use Dev C++ Debugger
Online GDB is online compiler and debugger for C/C. You can compile, run and debug code with gdb online. Using gcc/g as compiler and gdb as debugger. Currently C and C. C/C for Visual Studio Code (Preview) C/C support for Visual Studio Code is provided by a Microsoft C/C extension to enable cross-platform C and C development on Windows, Linux, and macOS. Getting started C/C compiler and debugger. The C/C extension does not include a C compiler or debugger. May 22, 2010 When I try to use the debugger in Dev C it always says 'your project does not have debugging info, do you want to enable debugging and rebuild your project?' - so I hit yes, it compiles and then it doesn't seem to do anything. I want to debug such that I can step through each line and see how. When trying to debug memory-related failures in C, you can also use breakpoints to inspect address values (look for NULL) and reference counts. Navigate code. There are different commands to instruct the debugger to continue. We show a useful code navigation command that is available starting in Visual Studio 2017.
What is Dev-C++?
Dev-C++, developed by Bloodshed Software, is a fully featured graphical IDE (Integrated Development Environment), which is able to create Windows or console-based C/C++ programs using the MinGW compiler system. MinGW (Minimalist GNU* for Windows) uses GCC (the GNU g++ compiler collection), which is essentially the same compiler system that is in Cygwin (the unix environment program for Windows) and most versions of Linux. There are, however, differences between Cygwin and MinGW; link to Differences between Cygwin and MinGW for more information.
Bloodshed!?
I'll be the first to say that the name Bloodshed won't give you warm and fuzzies, but I think it's best if the creator of Bloodshed explains:
There's also a reason why I keep the Bloodshed name. I don't want people to think Bloodshed is a company, because it isn't. I'm just doing this to help people.
Here is a good remark on the Bloodshed name I received from JohnS:
I assumed that this was a reference to the time and effort it requires of you to make these nice software programs, a la 'Blood, Sweat and Tears'.
Peace and freedom,
Colin Laplace
How To Use Dev C++ Debugger Windows 10
Getting Dev-C++
The author has released Dev-C++ as free software (under GPL) but also offers a CD for purchase which can contain all Bloodshed software (it's customizable), including Dev-C++ with all updates/patches.
Link to Bloodshed Dev-C++ for a list of Dev-C++ download sites.
You should let the installer put Dev-C++ in the default directory of C:Dev-Cpp, as it will make it easier to later install add-ons or upgrades.
Using Dev-C++
This section is probably why you are here.
All programming done for CSCI-2025 will require separate compilation projects (i.e. class header file(s), class implementation file(s) and a main/application/client/driver file). This process is relatively easy as long as you know what Dev-C++ requires to do this. In this page you will be given instructions using the Project menu choice. In another handout you will be given instructions on how to manually compile, link and execute C++ files at the command prompt of a command window. See here.
Step 1: Configure Dev-C++.
We need to modify one of the default settings to allow you to use the debugger with your programs.
- Go to the 'Tools' menu and select 'Compiler Options'.
- In the 'Settings' tab, click on 'Linker' in the left panel, and change 'Generate debugging information' to 'Yes':
- Click 'OK'.
Step 2: Create a new project.
A 'project' can be considered as a container that is used to store all the elements that are required to compile a program.
- Go to the 'File' menu and select 'New', 'Project..'.
- Choose 'Empty Project' and make sure 'C++ project' is selected.
Here you will also give your project a name. You can give your project any valid filename, but keep in mind that the name of your project will also be the name of your final executable. - Once you have entered a name for your project, click 'OK'.
- Dev-C++ will now ask you where to save your project.
Step 3: Create/add source file(s).
You can add empty source files one of two ways:
- Go to the 'File' menu and select 'New Source File' (or just press CTRL+N) OR
- Go to the 'Project' menu and select 'New File'.
Note that Dev-C++ will not ask for a filename for any new source file until you attempt to:- Compile
- Save the project
- Save the source file
- Exit Dev-C++
- Go to the 'Project' menu and select 'Add to Project' OR
- Right-click on the project name in the left-hand panel and select 'Add to Project'.
| EXAMPLE: Multiple source files In this example, more than 3 files are required to compile the program; The 'driver.cpp' file references 'Deque.h' (which requires 'Deque.cpp') and 'Deque.cpp' references 'Queue.h' (which requires 'Queue.cpp'). |
Step 4: Compile.
Once you have entered all of your source code, you are ready to compile.
- Go to the 'Execute' menu and select 'Compile' (or just press CTRL+F9).
It is likely that you will get some kind of compiler or linker error the first time you attempt to compile a project. Syntax errors will be displayed in the 'Compiler' tab at the bottom of the screen. You can double-click on any error to take you to the place in the source code where it occurred. The 'Linker' tab will flash if there are any linker errors. Linker errors are generally the result of syntax errors not allowing one of the files to compile.
How To Use Dev C Debugger In Firefox
Step 5: Execute.
You can now run your program.
- Go to the 'Execute' menu, choose 'Run'.
Disappearing windows
If you execute your program (with or without parameters), you may notice something peculiar; a console window will pop up, flash some text and disappear. The problem is that, if directly executed, console program windows close after the program exits. You can solve this problem one of two ways:
- Method 1 - Adding one library call:
On the line before the main's return enter:system('Pause');
- Method 2 - Scaffolding:
Add the following code before any return statement in main() or any exit() or abort() statement (in any function):/* Scaffolding code for testing purposes */
This will give you a chance to view any output before the program terminates and the window closes.
cin.ignore(256, 'n');
cout << 'Press ENTER to continue..'<< endl;
cin.get();
/* End Scaffolding */ - Method 3 - Command-prompt:
Alternatively, instead of using Dev-C++ to invoke your program, you can just open an MS-DOS Prompt, go to the directory where your program was compiled (i.e. where you saved the project) and enter the program name (along with any parameters). The command-prompt window will not close when the program terminates.
For what it's worth, I use the command-line method.
Step 6: Debug.
When things aren't happening the way you planned, a source-level debugger can be a great tool in determining what really is going on. Dev-C++'s basic debugger functions are controlled via the 'Debug' tab at the bottom of the screen; more advanced functions are available in the 'Debug' menu.
Using the debugger:
The various features of the debugger are pretty obvious. Click the 'Run to cursor' icon to run your program and pause at the current source code cursor location; Click 'Next Step' to step through the code; Click 'Add Watch' to monitor variables.
Setting breakpoints is as easy as clicking in the black space next to the line in the source code.
See the Dev-C++ help topic 'Debugging Your Program' for more information.
Dev-C++ User F.A.Q.
Why do I keep getting errors about 'cout', 'cin', and 'endl' being undeclared?
It has to do with namespaces. You need to add the following line after the includes of your implementation (.cpp) files:
How do I use the C++ string class?
Again, it probably has to do with namespaces. First of all, make sure you '#include <string>' (not string.h). Next, make sure you add 'using namespace std;' after your includes.
Example:
That's it for now.
I am not a Dev-C++ expert by any means (in fact, I do not teach C++ nor use it on a regular basis), but if you have any questions, feel free to email me at jaime@cs.uno.eduHappy coding!
-->Use the Debugger to step through code, set watches and breakpoints, live edit your code and inspect your caches. Test and troubleshoot your code by:
- Browsing and searching code from your loaded source files
- Controlling the execution flow as you step through your code
- Managing page storage resources, including the service workers and cache, cookies and web storage
- Setting breakpoints and live editing your code as it runs
- Tracking and editing local variables as you debug
- Hiding or showing asynchronous code and library code from your callstack as needed
- Adding specialized breakpoints for XmlHttpRequests, events and DOM mutations
There are three ways to begin a debugging session.
- Set a breakpoint. When the execution of your code reaches it, you'll enter the debugger and be able to step through your code.
- Initiate a break in code. Click the Break (pause icon) toolbar button or
Ctrl+Shift+B. The debugger will break on the next statement of execution. - Set exception behavior. Use the Change exception behavior menu (
Ctrl+Shift+E) to break into the debugger when your code throws an exception. By default, the debugger is set to Never break on exceptions, but they are logged to the console.
Resource picker
Often the first step in debugging is to set breakpoints in the code you're looking to troubleshoot. You can find all the code files currently loaded by the page from the Resource picker pane, including .html, .css and .js files.
Clicking on a file entry will open a tab for that file in the Debug window and bold the text of the file name to indicate this (as devtools-guide file name is in the illustration above). You can then set breakpoints within that file from the Debug window.
From the Resource picker context menu, you can also mark a file as library code (Ctrl+L), giving you the option to skip over that code in the debugger and hide it from the Call stack pane. Clicking (or Ctrl+L) again will toggle the file back to its previous value as my code or library code.
File search
Use the Find in files command (Ctrl+Shift+F) when you have a specific string of code you're trying to find in the source. The toolbar provides different search options, including regular expressions. Clicking on a search result will focus the Debug window on the specified file and line.
Debug window
The Debug window is where you set your breakpoints, step through code, and live edit your script as you debug. Click to the left of any script command to add (or remove) a Breakpoint. Use the right-click context menu or Breakpoints pane to Add a condition to the breakpoint by supplying a logical expression that causes the debugger to break if it evaluates True at that location.
Other features of the debug window include controls for:
1. Code editing
You can edit your JavaScript live during a debugging session. Once you make your changes, click Save (Ctrl+S) to test your changes next time that section of code runs. If you have unsaved code changes, an asterisk (*) will appear before the file name in the Debug window tab.
Click the Compare document to original button to view the diff of what you changed.
Dev C++ Debugger Tutorial
Please be aware of the following constraints:
- Script editing only works in external .js files (and not embedded
<script>within .html) - Edits are saved in memory and flushed when the document is reloaded, thus you won't be able to run edits inside a
DOMContentLoadedhandler, for example - Currently there's no way (such as a Save As option) to save your edits to disk from the DevTools
2.Code formatting
Use these controls to format minified code for better readability as you debug:
Pretty print (Ctrl+Shift+P)
Adds line breaks and curly brace alignment per JavaScript conventions. Even compressed code that's been made more readable with this option may have function, selector, and variable names that are much different than in your original source code. In these cases, the Toggle source maps option might be available.
Word wrap (Alt+W)
Adjusts code to fit within the current margins of the debug window (eliminating the need for horizontal scrolling).
3. Code scoping
You can direct the debugger to ignore certain files with the Mark as library code (Ctrl+L) button. By default, the Debug just my code toolbar button is on, meaning that the debugger will skip over any files that you mark as library code and they will not appear in the debugger call stack. Depressing the button (Mark as my code, Ctrl+L) will remove this flag.
For keeping track of libraries across debugging sessions, you can edit these files to maintain a default list or add wildcards for a domain or file type:
Source maps
You will see the Toggle source maps button enabled for code written in a language that compiles to JavaScript or CSS and that provides a source map (an intermediate file mapping to the original source). This option directs the debugger to present the original source to use for debugging (rather than the compiled file that's actually running in the browser).
The DevTools will check if the compiler that generated the JavaScript file included a comment with the name of the map file. For example, if a compiler compressed myfile.js to myfile.min.js, it might also generate a map file, myfile.min.js.map and include a comment in the compressed file like this:
If the DevTools can't find the map automatically, you can choose a source map for that file. Right-click the file's tab to find the Choose source map option.
Toolbar
Use the debugger Toolbar to control how you step through code, and what code to step through or ignore. From here you can also do a full text search across your code files for specific strings.
1. Continue (F5) / Break (Ctrl+Shift+B)
Continue (F5) continues code execution to the next breakpoint. Holding down F5 will repeatedly move past breaks until you release it.
Break (Ctrl+Shift+B) will break into the debugger after running the next statement.
2. Step functions (F11, Ctrl+F10, Shift+F11)
Step into (F11) steps into the function being called.
Step over (Ctrl+F10) steps over the function being called.
Step out (Shift+F11) steps out of the current function and into the calling function.
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The debugger will step to the next statement if it is not at a function when these commands are used.
3. Break on new worker (Ctrl+Shift+W)
Breaks on the creation of a new web worker.
4. Exception control
Change exception behavior (Ctrl+Shift+E) opens options to change how the debugger reacts to exceptions. By default exceptions are ignored by the debugger and logged to the Console. You can choose to Break on all exceptions, or just those not being handled by try..catch statements in your code (Break on unhandled exceptions).
5. View search results
(Currently disabled.) Show/Hide results toggles the display of Find in files search results.
6. Find in files (Ctrl+F)
Find in files (Ctrl+F) runs a text search through all the loaded files within the Resource picker. If the text is found, it opens the first file matching the search string. Pressing Enter or F3 takes you to the next match.
7. Debug just my code (Ctrl+J)
Debug just my code (Ctrl+J) acts as a toggle to include or exclude all the files that have been marked as library code as you step through the debugger.
8. Debugger connection
Disconnect/Connect debugger is essentially the on/off switch for the debugger.
Watches
Use the Watches pane to browse a catalog of all objects and variables (Locals), both in the local and global scope, available to the statement that is the focus of the current break in the debugger.
You can track the value of specific variables as they pass in and out of scope by adding a watch (Add watch, Ctrl+W) and modify any editable values by double-clicking on it or by selecting Edit value from the Context menu. Clear your watches using the Delete (Ctrl+D) / Delete all buttons or from the context menu.
Details
The Details pane includes the Callstack, Breakpoints and DOM breakpoints tabs.
Call stack
The Call stack tab shows the chain of functions that led to the current point of execution. The current function appears at the top, and the calling functions appear below it in reverse order.
The Show/Hide library frames button (Ctrl+Shift+J) toggles the output of library code from the call stack. Use the Library code option (Ctrl+L) from the right-click Context menu to mark (or unmark) the source of the selected frame as library code.
The Show/Hide async frames button toggles the display of roots for asynchronous function calls.
Breakpoints
From the Breakpoints tab, you can manage you breakpoints and event tracepoints, including setting conditions, disabling and deleting them.
Here's a summary of the different types of breakpoints you can use for debugging.
| Breakpoint type | Description | How to set it |
|---|---|---|
| Breakpoint | Breaks into the debugger just before the specified line of code is executed. Regular breakpoints are easiest to set if you have one statement per line. | From the Debug window, click in the left margin next to any line number in the code. A red dot appears and the breakpoint is set. You can jump into the source of any breakpoint by clicking on its blue text. |
| Conditional breakpoint | Breaks if the specified condition evaluates to true. This is essentially an if(condition) for breaking into the debugger. | From the Breakpoints tab, hover over an existing breakpoint and click the 'pencil' button (Add a condition to this breakpoint), right-click an existing breakpoint and select Condition.. from the context menu. Specify the 'if' condition to be evaluated at the breakpoint location. |
| XMLHttpRequest breakpoint (w/optional condition) | Breaks whenever a XMLHttpRequest (XHR) request has been fulfilled. You can inspect the XHR response object from the Watches pane. | From the Breakpoints tab, click the XMLHttpRequest breakpoint button (circle with up/down arrows). You can turn it into a Conditional breakpoint as described above. |
| Event tracepoint | Calls console.log() with a specified string in response to a specific event. Use this for temporary console logging statements that you don't want to save directly in your event handler code. | From the Breakpoints tab, click the Event tracepoint button (diamond with lightning bolt). Select an Event type for the trigger and a Trace statement for logging. |
| Event breakpoint (w/optional condition) | Breaks whenever a specified event is fired. | From the Breakpoints tab, click the Event breakpoint button (circle with lightning bolt). Select an Event type for the trigger and optionally, specify a Condition statement. |
| DOM breakpoint | Breaks whenever a specified element on the page is mutated, such as when its subtree is modified, its attributes change, or when it is detached from the DOM. | From the Elements tab, right-click on a source element and select from the DOM Breakpoints options. Use the DOM breakpoints tab in either the Debugger or Elements panels to manage your breakpoints. |
Conditional breakpoints and tracepoints have access to all the local and global variables currently in scope when they break into the debugger.
DOM breakpoints
Manage your DOM mutation breakpoints from the DOM breakpoints tab, including disabling, deleting and rebinding them. DOM breakpoints can be set from the HTML tree view in the Elements panel.
The DOM breakpoints tab in the Debugger provides equivalent functionality to the DOM breakpoints* tab on the Elements panel.
Here's more on the different types of DOM breakpoints.
Shortcuts
Toolbar shortcuts
| Action | Shortcut |
|---|---|
| Find | Ctrl + F |
| Continue (from breakpoint) | F5 or F8 |
| Fast continue | Hold F5 or F8 |
| Continue and refresh | Ctrl + Shift + F5 |
| Break | Ctrl + Shift + B |
| Step into | F11 |
| Step over | F10 |
| Step out | Shift + F11 |
| Break on new worker | Ctrl + Shift + W |
| Change exception behavior (opens menu) | Ctrl + Shift + E |
| Debug just my code | Ctrl + J |
Resource picker shortcuts
| Action | Shortcut |
|---|---|
| Mark as my code / library code | Ctrl + L |
| Open file | Ctrl + O, Ctrl + P |
| Search all files | Ctrl + Shift + F |
Debug window shortcuts
| Action | Shortcut |
|---|---|
| Remove breakpoint | F9 |
| Disable breakpoint | Ctrl + F9 |
| Conditional breakpoint.. | Alt + F9 |
| Copy | Ctrl + C |
| Save | Ctrl + S |
| Go to line.. | Ctrl + G |
| Show next statement | Alt + Num + * |
| Run to cursor | Ctrl + F10 |
| Set next statement | Ctrl + Shift + F10 |
| Show in file picker | Ctrl + Alt + P |
| Go to definition in file | Ctrl+D |
| Find references in file | Ctrl + Shift + D |
| Pretty print | Ctrl + Shift + P |
| Word wrap | Alt + W |
| Mark as my code/library code | Ctrl + L |
| Disable/Enable tabs in the editor. Note: if you're using the keyboard to navigate in the Debugger, you won't be able to tab out of the editor until you disable tabbing | Ctrl + M |
Shortcuts for Watches pane
| Action | Shortcut |
|---|---|
| Add watch | Ctrl + W |
| Delete watch | Ctrl + D |
Shortcuts for Details pane
| Action | Shortcut |
|---|---|
| Show/Hide frames from library code | Ctrl + Shift + J |
| Enable all breakpoints | Ctrl + Shift + F11 |