error LNK2001 unresolved external symbol C

Question

Say I have this function called DoThis const char  abc  in a file called one cpp  So when I attempt to call this function from another function in a different source file  two cpp   I get the error  error LNK2001  unresolved external symbol  C     even though I used  include  one h  What would I do to fix this

User · Answer

That means that the definition of your function is not present in your program. You forgot to add that one.cpp to your program.

What "to add" means in this case depends on your build environment and its terminology. In MSVC (since you are apparently use MSVC) you'd have to add one.cpp to the project.

In more practical terms, applicable to all typical build methodologies, when you link you program, the object file created form one.cpp is missing.

User · Answer

Sounds like you are using Microsoft Visual C     If that is the case  then the most possibility is that you don t compile your two cpp with one cpp  one cpp is the implementation  for one h    If you are from command line  cmd exe   then try this first  cl -o two exe one cpp two cpp  If you are from IDE  right click on the project name from Solution Explore   Then choose Add  Existing Item     Add one cpp into your project

[c++] error LNK2001: unresolved external symbol (C++)

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