Gcc/10.2.0/cpp/Else
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4.2.4 Else
The ‘#else
’ directive can be added to a conditional to provide
alternative text to be used if the condition fails. This is what it
looks like:
#if expression text-if-true #else /* Not expression */ text-if-false #endif /* Not expression */
If expression
is nonzero, the text-if-true
is included and
the text-if-false
is skipped. If expression
is zero, the
opposite happens.
You can use ‘#else
’ with ‘#ifdef
’ and ‘#ifndef
’, too.