[Info-vax] C limitations, was: Re: VMS process communication

[Arne Vajhøj]

On 4/23/2023 9:46 AM, bill wrote:
> On 4/22/2023 7:47 PM, Arne Vajhøj wrote:
>> True. In C the isdigit function would be much better than a range check.
> 
> A cute idea, but also a modern accretion. Early C didn't have it
> and as much as people like to say comparing a char to it's numeric
> value is not a good idea it was quite common at one time.  I know,
> because I was the one tasked with porting some of this code to
> Primix where the chars all had a different numeric value.  I don't
> know why they did it, but they did.

Different people may have different definitions of "modern".

isdigit is in C89 so it has been standard for over 30 years.

Arne