CODEWITHSUNDEEP
c++
SPB
SPB

Reputation: 4218

unresolved external symbol in c++

I have defined a global variable in a c++ file. eg: bool _variable =1;

Now i use this variable in other c++ file using : extern bool _variable.

But i am getting the error error LNK2001: unresolved external symbol "bool _variable" (?_variable@@3_NA).

How can i resolve this error??

Upvotes: 0

Views: 719

Answers (2)

Vladimir
Vladimir

Reputation: 1797

Maybe you forgot to include file with defined variable into the project (assuming you're using VS).

Upvotes: 1

peoro
peoro

Reputation: 26060

It means the linker cannot find the definition of such variable.

  • Are you sure you wrote it in the same way anywhere?

  • Are you sure the c++ file containing the definition gets compiled and linked with the others when you're getting such error?

  • Are you sure the namespace where such variable is defined is the same?

Upvotes: 4

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