5 ms·

What about while? while(flag = 0) looks like a similar error, but while(foo = read()) is a common idiom.

• brownleej 16y ago
  I think some compilers give a warning on while(foo = read()) but not on while((foo = read())).
  • CamperBob 16y ago
    That would be a broken compiler.
    • tbrownaw 16y ago
      No, I'm pretty sure that's intentional specifically to permit that idiom.
      • __david__ 16y ago
        It's usually a warning that you have to turn on explicitly, or one that you can at least turn off (thank heavens).
• CamperBob 16y ago
  It's not the choice of keyword that (should) trigger the warning. It's the simple fact that an expression that evaluates to boolean contains an '='. This potential error is trivial for any compiler to flag.