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Fatal Error C1016

  • Article

#ifdef expected an identifier#ifndef expected an identifier

The conditional compilation directive (#ifdef or #ifndef) has no identifier to evaluate. To resolve the error, specify an identifier.

The following sample generates C1016:

// C1016.cpp
#ifdef   // C1016
#define FC1016
#endif

int main() {}

Possible resolution:

// C1016b.cpp
#ifdef X
#define FC1016
#endif

int main() {}