keyword do

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The do keyword beings a do-while loop. Unlike a while loop, a do-while loop executes its body statement at least once.

Example:

 bool bQuit = false;
 do {
   char ch;
   if(!std::cin >> ch) {
     bQuit = true;
   }

   if(ch == 'Q' || ch == 'q') {
     bQuit = true;
   }

   switch(ch) {
     /* handle other input */
   }
 } while(!bQuit);

Note that the trailing ';' after the while is a required part of the syntax.

See also: for, while, break, continue, if