scanf not getting entire long value

[Sib]

I am trying to read two long values in using scanf() as follows:

long lower, upper;
scanf("%ld %ld", &lower, &upper);

When I enter: 999900000 1000000000

I get: lower = 999900000 but upper = 1

I am obviously missing something here, any idea what?

[ciubotariu]

Works fine ...

Sib wrote:

I am trying to read two long values in using scanf() as follows:

long lower, upper;
scanf("%ld %ld", &lower, &upper);

When I enter: 999900000 1000000000

I get: lower = 999900000 but upper = 1

I am obviously missing something here, any idea what?

[Sib]

Not working on mine. I know this isn't the place to speak of compilers, but
I'm using MS-VC6 SP6 (on my notebook). I've got a linux box I will try with
gcc, with hopefully better results. Thanks for checking.

Sib

<ci********@gma il.com> wrote in message
news:11******** **************@ g43g2000cwa.goo glegroups.com.. .

Works fine ...

Sib wrote:

I am trying to read two long values in using scanf() as follows:

long lower, upper;
scanf("%ld %ld", &lower, &upper);

When I enter: 999900000 1000000000

I get: lower = 999900000 but upper = 1

I am obviously missing something here, any idea what?

[Jack Klein]

On Sun, 15 May 2005 20:19:01 -0400, "P.J. Plauger"
<pj*@dinkumware .com> wrote in comp.lang.c:

"Sib" <si******@gmail .com> wrote in message
news:nr******** ********@fe06.l ga...

Not working on mine. I know this isn't the place to speak of compilers,
but I'm using MS-VC6 SP6 (on my notebook). I've got a linux box I will
try with gcc, with hopefully better results. Thanks for checking.

Sib

<ci********@gma il.com> wrote in message
news:11******** **************@ g43g2000cwa.goo glegroups.com.. .

Works fine ...

Sib wrote:
I am trying to read two long values in using scanf() as follows:

long lower, upper;
scanf("%ld %ld", &lower, &upper);

When I enter: 999900000 1000000000

I get: lower = 999900000 but upper = 1

I am obviously missing something here, any idea what?

Both numbers are too large to represent in a 32-bit signed
long.

Perhaps you miscounted the '0' characters.

========
#include <stdio.h>
#include <limits.h>

int main(void)
{
char *input = "999900000 1000000000";
long lower, upper;

sscanf(input, "%ld %ld", &lower, &upper);
printf("LONG_MA X = %10ld\n"
" lower = %10ld\n"
" upper = %10ld\n\n",
LONG_MAX, lower, upper);
return 0;
}
========

Output:

LONG_MAX = 2147483647
lower = 999900000
upper = 1000000000

--
Jack Klein
Home: http://JK-Technology.Com
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[Martin Ambuhl]

Sib wrote:

I am trying to read two long values in using scanf() as follows:

long lower, upper;
scanf("%ld %ld", &lower, &upper);

When I enter: 999900000 1000000000

I get: lower = 999900000 but upper = 1

I am obviously missing something here, any idea what?

A compilable example of your problem.
Try the following. If it succeeds on your implementation, then the
problem lies somewhere other than where you think.

#include <stdio.h>

int main(void)
{
long lower, upper;
char input[] = "999900000 1000000000";
printf("testing with input of \"%s\"\n", input);
sscanf(input, "%ld %ld", &lower, &upper);
printf("values read: %ld %ld\n", lower, upper);
return 0;
}

[output]
testing with input of "999900000 1000000000"
values read: 999900000 1000000000

[Sib]

"Martin Ambuhl" <ma*****@earthl ink.net> wrote in message
news:dk******** *********@newsr ead2.news.atl.e arthlink.net...

Sib wrote:

I am trying to read two long values in using scanf() as follows:

long lower, upper;
scanf("%ld %ld", &lower, &upper);

When I enter: 999900000 1000000000

I get: lower = 999900000 but upper = 1

I am obviously missing something here, any idea what?

A compilable example of your problem.
Try the following. If it succeeds on your implementation, then the problem
lies somewhere other than where you think.

#include <stdio.h>

int main(void)
{
long lower, upper;
char input[] = "999900000 1000000000";
printf("testing with input of \"%s\"\n", input);
sscanf(input, "%ld %ld", &lower, &upper);
printf("values read: %ld %ld\n", lower, upper);
return 0;
}

[output]
testing with input of "999900000 1000000000"
values read: 999900000 1000000000

As you suspected, I had a bug in my program, silly beginner mistake...
Needed array to hold at most 100000 int values, I was doing the following to
initialize all values to 1:

int b[100000];

for(int i = 0; i < upper-lower+1; i++)
b[i] = 1;

b[] has 100000 spots, 0 thru 99999, not 0 thru 100000 (duh!). Writing
b[100000] = 1 was actually writing upper = 1. Changed test case to:

i < upper-lower

and things work like a charm.

Thanks for looking, and sorry to take your time with this silly mistake.

Sib

[Kevin D. Quitt]

On Mon, 16 May 2005 22:30:21 -0400, "Sib" <si******@gmail .com> wrote:

As you suspected, I had a bug in my program, silly beginner mistake...

int b[100000];

for(int i = 0; i < upper-lower+1; i++)
b[i] = 1;

Which is why it's important to post the *entire* smallest code fragment that exhibits the
behaviour, and not just the lines you think are the problem. Next time...
--
#include <standard.discl aimer>
_
Kevin D Quitt USA 91387-4454 96.37% of all statistics are made up