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C++ project

Got some time and started to set up a project to work with c++ ( one of the requirements for the next project )

but after trying a few different variations I'm still getting an error.

error #10234-D: unresolved symbols remain
error #10010: errors encountered during linking; "HaloCPP.out" not built

my main file looks like this:

the other file is Temperature.h which is a C++ class.

if someone has an idea, please let me know.