> > >   cout<<(500000000*7);

> > Quotation from ISO/IEC 14882:1998(E), Chapter 5 (Expressions):

> > |  5 If during the evaluation of an expression, the result is not
> > |    mathematically defined or not in the range of representable values
> > |    for its type, the behavior is undefined, unless such an expression is
> > |    a constant expression (5.19), in which case the program is ill-formed.

> > The standard doesn't mention that no diagnonstic is required, so
> > conforming implementations have to refuse to compile this program.

> The standard does not have to mention that no diagnostic is required
> if undefined behavior is involved.  A diagnostic is never required for
> undefined behavior.  Among other things, requiring a diagnostic would
> be defining a behavior.

The point here is that (500000000*7) is a constant expression (would
someone who has read �5.19 please confirm this?) and the program is
therefore ill-formed. The wording of the passage quoted above
contrasts this situation with the more general case where the behavior
is undefined; one is therefore tempted to read it as meaning that a
diagnostic *is* required in this particular case.