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what is the meaning of that errorenter image description here Error LNK2019 unresolved external symbol "bool __cdecl checkprime(int)" (?checkprime@@YA_NH@Z) referenced in function _main Project3 D:\projects\Project3\Source.obj

Severity Code Description Project File Line Suppression State Error LNK1120 1 unresolved externals Project3 D:\projects\Project3\Debug\Project3.exe 1

Mohamed Hazem
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  • Does this answer your question? [What is an undefined reference/unresolved external symbol error and how do I fix it?](https://stackoverflow.com/questions/12573816/what-is-an-undefined-reference-unresolved-external-symbol-error-and-how-do-i-fix) – Ken White Apr 27 '21 at 00:03
  • You have declared a function named `checkprime` taking one parameter, and you are calling it, but you have never implemented it. You have implemented a different function, also named `checkprime` but taking two parameters; you aren't calling it. – Igor Tandetnik Apr 27 '21 at 21:59

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