== Synopsis ==
\if [\else ] \fi
== Description ==
The \if command denotes the start of an if-then-else control structure. The forms and must expand to tokens. and can be either a character or a control sequence. If and both expand to the same character code then is processed; otherwise it is ignored. If the \else section is included and and expand to different character codes, then is processed; otherwise it is ignored.
== A small LaTeX example ==
Here is a small LaTeX example, demonstrating the use of \if.
This example generates the output: