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by jomar 1917 days ago
For the same reason as in other languages (e.g., Perl, bash) with (effectively, in Perl's case) an explicit end-if keyword: so that you don't need a whole bunch of #endifs at the end of your conditional, one for each #if or #else … #if.

C itself doesn't need this, because you can write `else if …` without needing to put another layer of braces around the subordinate `if` statement.