how to run different files on xcode

how to run different files on xcode

I am brand new to Xcode. I am working on different problems and I just want to be able to run each file individually and switch between them. I keep getting "Linker command failed with exit code 1 (use -v to see invocation)". I think it has something to do with targeting? Thanks!

I am brand new to Xcode. I am working on different problems and I just want to be able to run each file individually and switch between them. I keep getting "Linker command failed with exit code 1 (use -v to see invocation)". I think it has something to do with targeting? Thanks!

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