Some C++ questions

[Joe Buck]

> Here are a couple of C++ scoping questions I have.

These are both areas where the committee changed the language since
the publication of the ARM.

> 1)
> 
> int main()
> {
>   if (int i = 10)
>     i++; // should be okay
>   i++; // shold be out of scope
> }
> 
> SGI CC v7.0 doesn't like the declaration within the if statement.

This was a relatively recent addition to the language.  It used to be
that you couldn't declare a variable in an if.

> 2)
> int main()
> {
>   for (int i = 0; i < 10; i++)
>     cout << i;
> 
>   for (int i = 0; i < 10; i++) // should be fine
>     cout << i;
> }
> 
> Both SGI CC v7.0 and SunPro CC 4.2 barf horribly at this.

So is this (in the ARM, the scope of the first i extends through
the rest of the file; the committee changed it).

> Who is right?

SGI and SunPro are no longer right (the language changed and they didn't
keep up).