Re: What are the 94 printable characters from the 128 characters of ASCII table?
- From: Ivan Shmakov <ivan@xxxxxxxxxxxxxxxx>
- Date: Mon, 25 Jul 2011 13:02:45 +0700
yudi v <yudi.tux@xxxxxxxxx> writes:
Hi Paul,
I am pretty sure you are mistaken,
126-32 = 94
Let's try a simpler range: 32 to 32 is 1 character. And 32 - 32
is, obviously, zero. Doesn't it seem like an off-by-one error?
and space is a printable character.
Well, I don't have an opinion of my own, but here's what GNU
Libc thinks on the issue:
$ cat < printable.c
#define _GNU_SOURCE
#include <ctype.h>
#include <stdio.h>
int
main ()
{
int i;
for (i = 0; i < 256; i++) {
printf (" %02x %s%s",
i,
(isprint (i) ? "P" : " "),
((1 + i) % 8 == 0
? "\n" : ""));
}
/* . */
return 0;
}
$ make printable
cc printable.c -o printable
$ ./printable
00 01 02 03 04 05 06 07
08 09 0a 0b 0c 0d 0e 0f
10 11 12 13 14 15 16 17
18 19 1a 1b 1c 1d 1e 1f
20 P 21 P 22 P 23 P 24 P 25 P 26 P 27 P
28 P 29 P 2a P 2b P 2c P 2d P 2e P 2f P
30 P 31 P 32 P 33 P 34 P 35 P 36 P 37 P
38 P 39 P 3a P 3b P 3c P 3d P 3e P 3f P
40 P 41 P 42 P 43 P 44 P 45 P 46 P 47 P
48 P 49 P 4a P 4b P 4c P 4d P 4e P 4f P
50 P 51 P 52 P 53 P 54 P 55 P 56 P 57 P
58 P 59 P 5a P 5b P 5c P 5d P 5e P 5f P
60 P 61 P 62 P 63 P 64 P 65 P 66 P 67 P
68 P 69 P 6a P 6b P 6c P 6d P 6e P 6f P
70 P 71 P 72 P 73 P 74 P 75 P 76 P 77 P
78 P 79 P 7a P 7b P 7c P 7d P 7e P 7f
80 81 82 83 84 85 86 87
…
f8 f9 fa fb fc fd fe ff
$
So, as per GNU Libc, the printable ASCII characters are 0x20 to
0x7e, inclusive, which amounts to (+ 1 #x7e #x-20) => 95
characters overall.
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