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A #if expression is a conditional expression that the preprocessor evaluates. You can write only integer constant expressions, with the following additional considerations:
The expression defined X, or defined (X), is replaced by 1 if X is defined as a macro, otherwise 0.
You cannot write the s_i_z_e_o_f or type cast operators. (The translator expands all macro names, then replaces each remaining name with 0, before it recognizes keywords.)
Мдяя если ничего не получается прочти наконец инструкцию :)
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