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#elif                    Abbreviation for #else and #if

 #elif constant-expression

    This directive provides a more elegant solution to nested #if
    directives than #else followed by #if.

      Notes:    constant-expression may not contain the sizeof operator,
                type casts or enumeration constants.

                If constant-expression contains a macro which is
                currently undefined, that macro is treated as though it
                were defined with a value of zero.