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program preprocessor21
#if (!defined(VAR1) | !defined(VAR2))
print *, "Atleast one of VAR1 and VAR2 isn't defined"
#else
print *, 'Both VAR1 and VAR2 are defined.'
#endif
#if (!defined(VAR3) & !defined(VAR4))
print *, "Neither of VAR3 or VAR4 is defined"
#else
print *, "At least one of VAR3 or VAR4 is defined."
#endif
#if (!defined(VAR5) ^ !defined(VAR6))
print *, "Exactly one of VAR5 or VAR6 is not defined."
#else
print *, "Both VAR5 and VAR6 are defined or neither is defined."
#endif
end program preprocessor21
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