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![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(6.4, 94%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EB%3C/text%3E%3C/svg%3E)
I built the example program from the "Header files (C++)" guide, and when I compile the solution I get a number of errors because the class 'my_class' is not recognized by 'my_class.cpp' nor 'my_program.cpp' (codes C2065, C2653, etc).
I presume you are referring to the example here:
Header files (C++)
https://learn.microsoft.com/en-us/cpp/cpp/header-files-cpp?view=vs-2019
It sounds like you didn't create the header file or add it to the project:
Thanks for the help! Although I did create the my_class.h header file and it appeared in my solution explorer, I realized I had not saved the content before compiling. I hit save all and the code compiled successfully.
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(256, 38%, 34%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ETR%3C/text%3E%3C/svg%3E)
My guess is you didn't copy the code from that page exactly. You have some kind of typo. Double check that your my_class.h has "namespace N" and "class my_class", spelled exactly like that.
Note that the code samples on that page have a "Copy" button that allows
you to automatically copy the code to Windows clipboard. Then all you have
to do is paste it into the relevant file in the VS IDE. No typing of the
code examples should be necessary, so there is minimal possibility of
making typo errors.