All are preprocessor Directives.. Refer http://msdn2.microsoft.com/en-us/l

which one is not preprocessor directive
a)#if b)#elif c)#undef d)#pragma

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Answer Posted / prem

All are preprocessor Directives..
Refer http://msdn2.microsoft.com/en-us/library/79yewefw
(VS.71).aspx

for details

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