18 Sep
2024
18 Sep
'24
11:51 p.m.
The array size} limit that I found through trial and
error is (2^15)-1.
Declaring an array that is [larger] results in an error of "Constant
required",
On its face, it states that anything bigger cannot be an integer constant,
which is reasonable because that's the largest (signed) integer value. Does
that version of C support unsigned constants?
Doug
18 Sep
18 Sep
11:57 p.m.
New subject: Maximum Array Sizes in 16 bit C
On Wed, 18 Sept 2024 at 19:51, Douglas McIlroy <
douglas.mcilroy(a)dartmouth.edu> wrote:
I believe that it does support (16 bit) unsigned int, but I don't think
that it supports (32 bit) unsigned long, only signed long. That's a great
suggestion of a place to start. Following Nelson's suggestion, if there
need to be negative references in array accesses (which certainly makes
sense to me, on its face), it seems reasonable to have whatever
intermediate variable be signed.
-Henry
The array
size} limit that I found through trial and error is (2^15)-1.
Declaring an array that is [larger] results in an error of "Constant
required",
On its face, it states that anything bigger cannot be an integer constant,
which is reasonable because that's the largest (signed) integer value. Does
that version of C support unsigned constants?
19 Sep
19 Sep
1:13 p.m.
New subject: Maximum Array Sizes in 16 bit C
if there need to be negative references in array accesses (which certainly
makes sense to me, on its face), it seems reasonable to have whatever
intermediate variable be signed.
In my first C programming job I saw the source to V7 grep which had a
"foo[-2]" construct. It was a moment of enlightenment and another bit of
K&R fell into place. (
https://www.tuhs.org/cgi-bin/utree.pl?file=V7/usr/src/cmd/grep.c; search
for "[-")
0
days inactive
1
days old
2 comments
3 participants
participants (3)
-
Douglas McIlroy -
Henry Bent -
Rich Salz