Date: Thu, 16 May 1996 14:56:36 -0400 (EDT) From: "Marc G. Fournier" <scrappy@ki.net> To: hackers@freebsd.org Subject: C Programming Question Message-ID: <Pine.NEB.3.93.960516144301.7805B-100000@freebsd.ki.net>
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Hi...
I'm trying to do something that I feel should be relatively
brain dead to do, but can't get it to work...change an ascii string
to a double.
I've tried using atof() and strtod(), and both return the
same answer...0.
The code is simple, and right now, just pulls the first line
from a file to manipulate it:
---[ short code segment ]----
#include <stdio.h>
#include <time.h>
#define DATAFILE "/home/staff/scrappy/snmp/values"
main(int argv, char **argc)
{
FILE *in;
char inbuf[80], *junk, str[20];
double value;
in=fopen(DATAFILE, "r");
fgets(inbuf, sizeof(inbuf), in);
printf("inbuf: %s\n", inbuf);
junk = strtok(inbuf, " ");
junk = strtok(NULL, " ");
strcpy(str, junk);
printf("%s\n", str);
value = strtod(str, NULL);
printf("[%f]\n", value);
fclose(in);
}
----[ end of code ]----
the output, when running this, looks like:
ki> ./double
inbuf: 832220635 1980972567 2198208632
1980972567
[0.000000]
Using atof() instead of strtod() gives the same result, so the
only thing I can think of is I'm missing something *really* simple here.
If I change it to use atoi(), the value comes up correctly, but
the second value in the inbuf comes out as:
2198208632
[2147483647]
Trying to set 'value' to be an unsigned int has the same result,
as well as unsigned long/atol()...nothing wants to exceed the 2147483647
barrier.
So...is it something I'm missing? According to the Unix C reference
I have, a 4byte int, unsigned, should give me 0->4294967295, but I'm only
getting half of that.
Marc G. Fournier scrappy@ki.net
Systems Administrator @ ki.net scrappy@freebsd.org
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