Liste des Groupes |
Rainer Weikusat <rweikusat@talktalk.net> writes:
Something which would match [0-9]+ in its first argument (if any) would>
be:
>
#include "string.h"
#include "stdlib.h"
>
int main(int argc, char **argv)
{
char *p;
unsigned c;
>
p = argv[1];
if (!p) exit(1);
while (c = *p, c && c - '0' > 10) ++p;
if (!c) exit(1);
return 0;
}
>
but that's 14 lines of text, 13 of which have absolutely no relation to
the problem of recognizing a digit.
Personally, I'd use:
>
$ cat /tmp/a.c
#include <stdint.h>
#include <string.h>
>
int
main(int argc, const char **argv)
{
char *cp;
uint64_t value;
>
if (argc < 2) return 1;
>
value = strtoull(argv[1], &cp, 10);
if ((cp == argv[1])
|| (*cp != '\0')) {
return 1;
}
return 0;
}
Les messages affichés proviennent d'usenet.