Texas Instruments TMS34010 - Page 169

#if /#ifdef /#ifndef /#else/#end if
Conditional Processing
Directives
8-4
• The #else directive. begins an alternate block of code that is compiled
if:
The condition tested
by #if is false.
The name tested by #ifdef is not defined.
The name tested
by #ifndef is defined.
Note that the
#else portion of a conditional block is optional; if the
#if, #ifdef, or#ifndef test
is not successful, then the preprocessor
continues
with the code following the #endif.
• The #endif directive ends a conditional block. Each #if, #ifdef, and
#ifndef directive must have a matching #endif. Conditional compila-
tion sequences can be nested.