Is “else if” a single keyword?

Question

I am new to C++. I often see conditional statement like below:

if 
  statement_0;
else if
  statement_1;

Question:

Syntacticall

Answer 1

else and if are two different C++ keywords. An if statement can be followed by an optional else if...else statement. An if statement can have zero or more else if's and they must come before the else.

You can find syntax and example in this if...else statement tutorial