Re: forbidden comparison

[Bill Allombert <Bill.Allombert@math.u-bordeaux.fr>]

On Wed, Jan 12, 2022 at 04:14:47AM +0100, Ruud H.G. van Tol wrote:
> 
> I expected this to just work:
> 
> my(v=23, c3=7); while( my(c=c3*2); c < v, c3=c ); print([v,c3]);
> 
> 
> Now changed it to;
> 
> my(v=23, c3=7);while( c3*2 < v, c3*=2 ); print([v,c3]);
> [23, 14]
> 
> 
> With 'if', this works:
> 
> ? my(v=23, c3=7); if(my(c=c3*2)*0+c, print(c))
> 14
> 
> but while has an extra scope?

Because the condition in 'while' is evaluated several times, while for
'if' it is evaluated only once, so there is no deferred execution
involved.

Cheers,
Bill