title: Arithmetic assignment operator - left side evaluated only once
body: <p>As the title says I found such a sentence in some C lecture notes.</p>
  
  <p>I can't invent any example proving that sentence. </p>
  
  <p>In my opinion every of assignment operations  is evaluated once, because when we want it to be evaluated more than once we put in in a loop. What am I missing then?</p>
  
  <p>I've searched but couldn't find an answer here on SO.</p>