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Visual C++ includes a C compiler that you can use to create everything from basic console programs to full Windows Desktop applications, mobile apps, and more.
This walkthrough shows how to create a basic, 'Hello, World'-style C program by using a text editor, and then compile it on the command line. If you'd rather work in C++ on the command line, see Walkthrough: Compiling a Native C++ Program on the Command Line. If you'd like to try the Visual Studio IDE instead of using the command line, see Walkthrough: Working with Projects and Solutions (C++) or Using the Visual Studio IDE for C++ Desktop Development.
Prerequisites
To complete this walkthrough, you must have installed either Visual Studio and the optional Visual C++ components, or the Build Tools for Visual Studio.
Visual Studio is a powerful integrated development environment that supports a full-featured editor, resource managers, debuggers, and compilers for many languages and platforms. For information on these features and how to download and install Visual Studio, including the free Visual Studio Community edition, see Install Visual Studio.
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The Build Tools for Visual Studio version of Visual Studio installs only the command-line toolset, the compilers, tools, and libraries you need to build C and C++ programs. It's perfect for build labs or classroom exercises and installs relatively quickly. To install only the command-line toolset, download Build Tools for Visual Studio from the Visual Studio downloads page and run the installer. In the Visual Studio installer, select the C++ build tools workload, and choose Install.
Before you can build a C or C++ program on the command line, you must verify that the tools are installed, and that you can access them from the command line. Visual C++ has complex requirements for the command-line environment to find the tools, headers, and libraries it uses. You can't use Visual C++ in a plain command prompt window without some preparation. You need a developer command prompt window, which is a regular command prompt window that has all the required environment variables set. Fortunately, Visual C++ installs shortcuts for you to launch developer command prompts that have the environment set up for command line builds. Unfortunately, the names of the developer command prompt shortcuts and where they're located are different in almost every version of Visual C++ and on different versions of Windows. Your first walkthrough task is to find the right shortcut to use.
Note
A developer command prompt shortcut automatically sets the correct paths for the compiler and tools, and for any required headers and libraries. Some of these values are different for each build configuration. You must set these environment values yourself if you don't use one of the shortcuts. For more information, see Set the Path and Environment Variables for Command-Line Builds. Because the build environment is complex, we strongly recommend you use a developer command prompt shortcut instead of building your own.
These instructions vary depending on which version of Visual Studio you are using. To see the documentation for your preferred version of Visual Studio, use the Version selector control. It's found at the top of the table of contents on this page.
Open a developer command prompt in Visual Studio 2019
If you have installed Visual Studio 2019 on Windows 10, open the Start menu, and then scroll down and open the Visual Studio 2019 folder (not the Visual Studio 2019 app). Choose Developer Command Prompt for VS 2019 to open the command prompt window.
If you're using a different version of Windows, look in your Start menu or Start page for a Visual Studio tools folder that contains a developer command prompt shortcut. You can also use the Windows search function to search for 'developer command prompt' and choose one that matches your installed version of Visual Studio. Use the shortcut to open the command prompt window.
Open a developer command prompt in Visual Studio 2017
If you have installed Visual Studio 2017 on Windows 10, open the Start menu, and then scroll down and open the Visual Studio 2017 folder (not the Visual Studio 2017 app). Choose Developer Command Prompt for VS 2017 to open the command prompt window.
If you're running a different version of Windows, look in your Start menu or Start page for a Visual Studio tools folder that contains a developer command prompt shortcut. You can also use the Windows search function to search for 'developer command prompt' and choose one that matches your installed version of Visual Studio. Use the shortcut to open the command prompt window.
Open a developer command prompt in Visual Studio 2015
If you have installed Microsoft Visual C++ Build Tools 2015 on Windows 10, open the Start menu, and then scroll down and open the Visual C++ Build Tools folder. Choose Visual C++ 2015 x86 Native Tools Command Prompt to open the command prompt window.
If you're running a different version of Windows, look in your Start menu or Start page for a Visual Studio tools folder that contains a developer command prompt shortcut. You can also use the Windows search function to search for 'developer command prompt' and choose one that matches your installed version of Visual Studio. Use the shortcut to open the command prompt window.
Next, verify that the Visual C++ developer command prompt is set up correctly. In the command prompt window, enter cl
and verify that the output looks something like this:
There may be differences in the current directory or version numbers, depending on the version of Visual C++ and any updates installed. If the above output is similar to what you see, then you're ready to build C or C++ programs at the command line.
Note
If you get an error such as 'cl' is not recognized as an internal or external command, operable program or batch file,' error C1034, or error LNK1104 when you run the cl command, then either you are not using a developer command prompt, or something is wrong with your installation of Visual C++. You must fix this issue before you can continue.
If you can't find the developer command prompt shortcut, or if you get an error message when you enter cl
, then your Visual C++ installation may have a problem. If you're using Visual Studio 2017 or later, try reinstalling the Desktop development with C++ workload in the Visual Studio installer. For details, see Install C++ support in Visual Studio. Or, reinstall the Build Tools from the Visual Studio downloads page. Don't go on to the next section until this works. For more information about installing and troubleshooting Visual Studio, see Install Visual Studio.
Note
Depending on the version of Windows on the computer and the system security configuration, you might have to right-click to open the shortcut menu for the developer command prompt shortcut and then choose Run as Administrator to successfully build and run the program that you create by following this walkthrough.
Create a C source file and compile it on the command line
In the developer command prompt window, enter
cd c:
to change the current working directory to the root of your C: drive. Next, entermd c:simple
to create a directory, and then entercd c:simple
to change to that directory. This directory will hold your source file and the compiled program.Enter
notepad simple.c
at the developer command prompt. In the Notepad alert dialog that pops up, choose Yes to create a new simple.c file in your working directory.In Notepad, enter the following lines of code:
On the Notepad menu bar, choose File > Save to save simple.c in your working directory.
Switch back to the developer command prompt window. Enter
dir
at the command prompt to list the contents of the c:simple directory. You should see the source file simple.c in the directory listing, which looks something like:The dates and other details will differ on your computer. If you don't see your source code file, simple.c, make sure you've changed to the c:simple directory you created, and in Notepad, make sure that you saved your source file in this directory. Also make sure that you saved the source code with a .c file name extension, not a .txt extension.
To compile your program, enter
cl simple.c
at the developer command prompt.You can see the executable program name, simple.exe, in the lines of output information that the compiler displays:
Note
If you get an error such as 'cl' is not recognized as an internal or external command, operable program or batch file,' error C1034, or error LNK1104, your developer command prompt is not set up correctly. For information on how to fix this issue, go back to the Open a developer command prompt section.
Note
If you get a different compiler or linker error or warning, review your source code to correct any errors, then save it and run the compiler again. For information about specific errors, use the search box at the top of this page to look for the error number.
To run your program, enter
simple
at the command prompt.The program displays this text and then exits:
Congratulations, you've compiled and run a C program by using the command line.
Next steps
This 'Hello, World' example is about as simple as a C program can get. Real world programs have header files and more source files, link in libraries, and do useful work.
You can use the steps in this walkthrough to build your own C code instead of typing the sample code shown. You can also build many C code sample programs that you find elsewhere. To compile a program that has additional source code files, enter them all on the command line, like:
cl file1.c file2.c file3.c
The compiler outputs a program called file1.exe. To change the name to program1.exe, add an /out linker option:
cl file1.c file2.c file3.c /link /out:program1.exe
And to catch more programming mistakes automatically, we recommend you compile by using either the /W3 or /W4 warning level option:
cl /W4 file1.c file2.c file3.c /link /out:program1.exe
The compiler, cl.exe, has many more options you can apply to build, optimize, debug, and analyze your code. For a quick list, enter cl /?
at the developer command prompt. You can also compile and link separately and apply linker options in more complex build scenarios. For more information on compiler and linker options and usage, see C/C++ Building Reference.
You can use NMAKE and makefiles, or MSBuild and project files to configure and build more complex projects on the command line. For more information on using these tools, see NMAKE Reference and MSBuild.
The C and C++ languages are similar, but not the same. The Microsoft C/C++ compiler (MSVC) uses a simple rule to determine which language to use when it compiles your code. By default, the MSVC compiler treats all files that end in .c as C source code, and all files that end in .cpp as C++ source code. To force the compiler to treat all files as C non-dependent of file name extension, use the /Tc compiler option.
MSVC is compatible with the ISO C99 standard, but not strictly compliant. In most cases, portable C code will compile and run as expected. Visual C++ doesn't support most of the changes in ISO C11. Certain library functions and POSIX function names are deprecated by MSVC. The functions are supported, but the preferred names have changed. For more information, see Security Features in the CRT and Compiler Warning (level 3) C4996.
See also
Walkthrough: Creating a Standard C++ Program (C++)
C Language Reference
Projects and build systems
Compatibility
Activate Developer Mode, sideload apps and access other developer features
If you are using your computer for ordinary day-to-day activities such as games, web browsing, email or Office apps, you do not need to activate Developer Mode and in fact, you shouldn't activate it. The rest of the information on this page won't matter to you, and you can safely get back to whatever it is you were doing. Thanks for stopping by!
However, if you are writing software with Visual Studio on a computer for first time, you will need to enable Developer Mode on both the development PC, and on any devices you'll use to test your code. Opening a UWP project when Developer Mode is not enabled will either open the For developers settings page, or cause this dialog to appear in Visual Studio:
When you see this dialog, click settings for developers to open the For developers settings page.
Note
You can go to the For developers page at any time to enable or disable Developer Mode: simply enter 'for developers' into the Cortana search box in the taskbar.
Accessing settings for Developers
To enable Developer mode, or access other settings:
- From the For developers settings dialog, choose the level of access that you need.
- Read the disclaimer for the setting you chose, then click Yes to accept the change.
Note
Enabling Developer mode requires administrator access. If your device is owned by an organization, this option might be disabled.
Here's the settings page on the desktop device family:
Which setting should I choose: sideload apps or Developer Mode?
Note
As of Windows Insider Build 18956, sideloading option has been removed and the Developer Mode is now a toggle. See more on sideloading in the next section.
You can enable a device for development, or just for sideloading.
- Microsoft Store apps is the default setting. If you aren't developing apps, or using special internal apps issued by your company, keep this setting active.
- Sideloading is installing and then running or testing an app that has not been certified by the Microsoft Store. For example, an app that is internal to your company only.
- Developer mode lets you sideload apps, and also run apps from Visual Studio in debug mode.
By default, you can only install Universal Windows Platform (UWP) apps from the Microsoft Store. Changing these settings to use developer features can change the level of security of your device. You should not install apps from unverified sources.
Sideload apps
Note
As of Windows Insider Build 18956, sideloading is enabled by default. Now, you can deploy a signed MSIX package onto a device without a special configuration.
The Sideload apps setting is typically used by companies or schools that need to install custom apps on managed devices without going through the Microsoft Store, or anyone else who needs to run apps from non-Microsoft sources. In this case, it's common for the organization to enforce a policy that disables the UWP apps setting, as shown previously in the image of the settings page. The organization also provides the required certificate and install location to sideload apps. For more info, see the TechNet articles Sideload apps in Windows 10 and Get started with app deployment in Microsoft Intune.
Device family specific info
On the desktop device family: You can install an app package (.appx) and any certificate that is needed to run the app by running the Windows PowerShell script that is created with the package ('Add-AppDevPackage.ps1'). For more info, see Packaging UWP apps.
On the mobile device family: If the required certificate is already installed, you can tap the file to install any .appx sent to you via email or on an SD card.
Sideload apps is a more secure option than Developer Mode because you cannot install apps on the device without a trusted certificate.
Note
If you sideload apps, you should still only install apps from trusted sources. When you install a sideloaded app that has not been certified by the Microsoft Store, you are agreeing that you have obtained all rights necessary to sideload the app and that you are solely responsible for any harm that results from installing and running the app. See the Windows > Microsoft Store section of this privacy statement.
Developer Mode
Developer Mode replaces the Windows 8.1 requirements for a developer license. In addition to sideloading, the Developer Mode setting enables debugging and additional deployment options. This includes starting an SSH service to allow this device to be deployed to. In order to stop this service, you have to disable Developer Mode.
When you enable Developer Mode on desktop, a package of features is installed that includes:
- Windows Device Portal. Device Portal is enabled and firewall rules are configured for it only when the Enable Device Portal option is turned on.
- Installs, and configures firewall rules for SSH services that allow remote installation of apps. Enabling Device Discovery will turn on the SSH server.
Additional Developer Mode features
For each device family, additional developer features might be available. These features are available only when Developer Mode is enabled on the device, and might vary depending on your OS version.
This image shows developer features for Windows 10:
Device Portal
To learn more about Device Portal, see Windows Device Portal overview.
For device specific setup instructions, see:
If you encounter problems enabling Developer Mode or Device Portal, see the Known Issues forum to find workarounds for these issues, or visit Failure to install the Developer Mode package for additional details and which WSUS KBs to allow in order to unblock the Developer Mode package.
SSH
SSH services are enabled when you enable Device Discovery on your device. This is used when your device is a remote deployment target for UWP applications. The names of the services are 'SSH Server Broker' and 'SSH Server Proxy'.
Note
This is not Microsoft's OpenSSH implementation, which you can find on GitHub.
In order to take advantage of the SSH services, you can enable device discovery to allow pin pairing. If you intend to run another SSH service, you can set this up on a different port or turn off the Developer Mode SSH services. To turn off the SSH services, turn off Device Discovery.
SSH login is done via the 'DevToolsUser' account, which accepts a password for authentication. This password is the PIN displayed on the device after pressing the device discovery 'Pair' button, and is only valid while the PIN is displayed. An SFTP subsystem is also enabled, for manual management of the DevelopmentFiles folder where loose file deployments are installed from Visual Studio.
Caveats for SSH usage
The existing SSH server used in Windows is not yet protocol compliant, so using an SFTP or SSH client may require special configuration. In particular, the SFTP subsystem runs at version 3 or less, so any connecting client should be configured to expect an old server. The SSH server on older devices uses ssh-dss
for public key authentication, which OpenSSH has deprecated. To connect to such devices the SSH client must be manually configured to accept ssh-dss
.
Device Discovery
When you enable device discovery, you are allowing your device to be visible to other devices on the network through mDNS. This feature also allows you to get the SSH PIN for pairing to this device by pressing the 'Pair' button exposed once device discovery is enabled. This PIN prompt must be displayed on the screen in order to complete your first Visual Studio deployment targeting the device.
You should enable device discovery only if you intend to make the device a deployment target. For example, if you use Device Portal to deploy an app to a phone for testing, you need to enable device discovery on the phone, but not on your development PC.
Optimizations for Windows Explorer, Remote Desktop, and PowerShell (Desktop only)
On the desktop device family, the For developers settings page has shortcuts to settings that you can use to optimize your PC for development tasks. For each setting, you can select the checkbox and click Apply, or click the Show settings link to open the settings page for that option.
Notes
In early versions of Windows 10 Mobile, a Crash Dumps option was present in the Developer Settings menu. This has been moved to Device Portal so that it can be used remotely rather than just over USB.
There are several tools you can use to deploy an app from a Windows 10 PC to a Windows 10 device. Both devices must be connected to the same subnet of the network by a wired or wireless connection, or they must be connected by USB. Both of the ways listed install only the app package (.appx/.appxbundle); they do not install certificates.
- Use the Windows 10 Application Deployment (WinAppDeployCmd) tool. Learn more about the WinAppDeployCmd tool.
- You can use Device Portal to deploy from your browser to a mobile device running Windows 10, Version 1511 or later. Use the Apps page in Device Portal to upload an app package (.appx) and install it on the device.
Failure to install Developer Mode package
Sometimes, due to network or administrative issues, Developer Mode won't install correctly. The Developer Mode package is required for remote deployment to this PC -- using Device Portal from a browser or Device Discovery to enable SSH -- but not for local development. Even if you encounter these issues, you can still deploy your app locally using Visual Studio, or from this device to another device.
See the Known Issues forum to find workarounds to these issues and more.
Note
If Developer Mode doesn't install correctly, we encourage you to file a feedback request. In the Feedback Hub app, select Add new feedback, and choose the Developer Platform category and the Developer Mode subcategory. Submitting feedback will help Microsoft resolve the issue you encountered.
Failed to locate the package
'Developer Mode package couldn’t be located in Windows Update. Error Code 0x80004005 Learn more'
This error may occur due to a network connectivity problem, Enterprise settings, or the package may be missing.
To fix this issue:
- Ensure your computer is connected to the Internet.
- If you are on a domain-joined computer, speak to your network administrator. The Developer Mode package, like all Features on Demand, is blocked by default in WSUS.2.1. In order to unblock the Developer Mode package in the current and previous releases, the following KBs should be allowed in WSUS: 4016509, 3180030, 3197985
- Check for Windows updates in the Settings > Updates and Security > Windows Updates.
- Verify that the Windows Developer Mode package is present in Settings > System > Apps & Features > Manage optional features > Add a feature. If it is missing, Windows cannot find the correct package for your computer.
After doing any of the above steps, disable and then re-enable Developer Mode to verify the fix.
Failed to install the package
'Developer Mode package failed to install. Error code 0x80004005 Learn more'
This error may occur due to incompatibilities between your build of Windows and the Developer Mode package.
To fix this issue:
- Check for Windows updates in the Settings > Updates and Security > Windows Updates.
- Reboot your computer to ensure all updates are applied.
Use group policies or registry keys to enable a device
For most developers, you want to use the settings app to enable your device for debugging. In certain scenarios, such as automated tests, you can use other ways to enable your Windows 10 desktop device for development. Note that these steps will not enable the SSH server or allow the device to be targeted for remote deployment and debugging.
You can use gpedit.msc to set the group policies to enable your device, unless you have Windows 10 Home. If you do have Windows 10 Home, you need to use regedit or PowerShell commands to set the registry keys directly to enable your device.
Use gpedit to enable your device
Run Gpedit.msc.
Go to Local Computer Policy > Computer Configuration > Administrative Templates > Windows Components > App Package Deployment
To enable sideloading, edit the policies to enable:
- Allow all trusted apps to install
OR
To enable developer mode, edit the policies to enable both:
- Allow all trusted apps to install
- Allows development of UWP apps and installing them from an integrated development environment (IDE)
Reboot your machine.
Use regedit to enable your device
Run regedit.
To enable sideloading, set the value of this DWORD to 1:
HKLMSOFTWAREMicrosoftWindowsCurrentVersionAppModelUnlockAllowAllTrustedApps
To enable developer mode, set the values of this DWORD to 1:
HKLMSOFTWAREMicrosoftWindowsCurrentVersionAppModelUnlockAllowDevelopmentWithoutDevLicense
Use PowerShell to enable your device
C Check If In Dev Mode Download
Run PowerShell with administrator privileges.
To enable sideloading, run this command:
OR
To enable developer mode, run this command:
Upgrade your device from Windows 8.1 to Windows 10
When you create or sideload apps on your Windows 8.1 device, you have to install a developer license. If you upgrade your device from Windows 8.1 to Windows 10, this information remains. Run the following command to remove this information from your upgraded Windows 10 device. This step is not required if you upgrade directly from Windows 8.1 to Windows 10, Version 1511 or later.
To unregister a developer license
C Check If In Dev Mode Free
- Run PowerShell with administrator privileges.
- Run this command:
unregister-windowsdeveloperlicense
.
C Check If In Dev Mode Windows 10
After this you need to enable your device for development as described in this topic so that you can continue to develop on this device. If you don't do that, you might get an error when you debug your app, or you try to create a package for it. Here is an example of this error:
C Check If In Dev Mode Full
Error : DEP0700 : Registration of the app failed.
C Check If In Dev Model
See Also
C Check If In Dev Mode Windows 10
- Publishing your UWP app.