Formatting code text

[une]

When writing code in C++ or Java I notice that I can get the code all nicley
aligned and indented correctly by simply adding a comment at the end of each
line of code. As you enter the //, the line of code moves to its correct
alignment. What I have been doing is writing my code and periodically
tidying it up by adding // at the end of every line of code. My question is,
can I speed this aligning and indenting process up by formatting the entire
file using one command? Emacs obviously knows how much each line should be
indented, but doing it one line at a time by adding // is laborious.
 
PS - I did not mean to cross post, my first post was in the Gnu Emacs forum.
Not sure how this website works yet. Sorry.
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