Help! help!

[questions]

when I type 12456,it will give me "1 2 4 5 6".But when the integer
is too great ,for example ,if I type 78965,it will not give me "7 8
9 6 5",but give me a wrong result,why????

#include<stdio. h>
int main()
{ int x,y,z,m,n,w;

printf("Give me an integer\n");
scanf("%d",&x);

y=x/10000;
z=x%10000/1000;
m=x%1000/100;
n=x%100/10;
w=x%10;

printf("%d %d %d %d %d",y,z,m,n,w );

return 0;}

[Kai-Uwe Bux]

Re: Help! help!

questions wrote:

when I type 12456,it will give me "1 2 4 5 6".But when the integer
is too great ,for example ,if I type 78965,it will not give me "7 8
9 6 5",but give me a wrong result,why????
>
#include<stdio. h>
int main()
{ int x,y,z,m,n,w;
>
printf("Give me an integer\n");
scanf("%d",&x);
>
y=x/10000;
z=x%10000/1000;
m=x%1000/100;
n=x%100/10;
w=x%10;
>
printf("%d %d %d %d %d",y,z,m,n,w );
>
return 0;}

Just a data point: when I try your code with g++ version 4.3.1 and 78965 as
input, I get exactly

7 8 9 6 5

as the output.


Best

Kai-Uwe Bux

[Rolf Magnus]

Re: Help! help!

questions wrote:

when I type 12456,it will give me "1 2 4 5 6".But when the integer
is too great ,for example ,if I type 78965,it will not give me "7 8
9 6 5",but give me a wrong result,why????

Well, depending on the target platform, the range of int can be as low
as -32767 ... +32767.

[Andre Kostur]

Re: Help! help!

questions <mengqidhuang@y ahoo.cnwrote in news:5e98b478-4415-4d99-b4da-
31ee5e75591b@e3 8g2000prn.googl egroups.com:

when I type 12456,it will give me "1 2 4 5 6".But when the integer
is too great ,for example ,if I type 78965,it will not give me "7 8
9 6 5",but give me a wrong result,why????
>
#include<stdio. h>
int main()
{ int x,y,z,m,n,w;
>
printf("Give me an integer\n");
scanf("%d",&x);
>
y=x/10000;
z=x%10000/1000;
m=x%1000/100;
n=x%100/10;
w=x%10;
>
printf("%d %d %d %d %d",y,z,m,n,w );
>
return 0;}
>

Because an int can only hold a certain size of number. The acutal size is
dependant on your platform. You do know that it can hold at least as large
as a short, and no more than a long. (Offhand it seems that your int is a
16-bit value, so the max number here is 32767. int's are signed so the
full range would be -32768 - 32767).

[Lightning]

Re: Help! help!

On Oct 26, 2:33 am, Rolf Magnus <ramag...@t-online.dewrote:

questions wrote:

when I type 12456,it will give me "1  2  4  5  6".But when the integer
is too great ,for example ,if I type 78965,it will not give me  "7  8
9  6  5",but give me a wrong result,why????

>
Well, depending on the target platform, the range of int can be as low
as -32767 ... +32767.

To elaborate on the post above, just make x,y,z,m,n,w long.

[James Kanze]

Re: Help! help!

On Oct 25, 11:51 am, questions <mengqidhu...@y ahoo.cnwrote:

when I type 12456,it will give me "1  2  4  5  6".But when the
integer is too great ,for example ,if I type 78965,it will not
give me  "7  8 9  6  5",but give me a wrong result,why????

On what machine? I'll suppose a 16 bit machine, since
otherwise, 78965 is not too big.

#include<stdio. h>
int main()
{ int x,y,z,m,n,w;

  printf("Give me an integer\n");
  scanf("%d",&x);

If the value read isn't representable in a int, you have
undefined behavior here. The next version of C++ will define
it strictly for operator>>. And from a QoI point of view, I
would expect defined behavior as well, with x being set to
MAX_INT (or MIN_INT, if the value was negative), and an error
being generated. (Of course, since you don't test the return
value of scanf, even if it does detect the error, you wouldn't
know.)

--
James Kanze (GABI Software) email:james.kan ze@gmail.com
Conseils en informatique orientée objet/
Beratung in objektorientier ter Datenverarbeitu ng
9 place Sémard, 78210 St.-Cyr-l'École, France, +33 (0)1 30 23 00 34

[peter koch]

Re: Help! help!

On 25 Okt., 15:46, Andre Kostur <an...@kostur.n etwrote:

questions <mengqidhu...@y ahoo.cnwrote in news:5e98b478-4415-4d99-b4da-
31ee5e755...@e3 8g2000prn.googl egroups.com:
>
>
>
>
>

when I type 12456,it will give me "1  2  4  5  6".But when the integer
is too great ,for example ,if I type 78965,it will not give me  "7  8
9  6  5",but give me a wrong result,why????

>

#include<stdio. h>
int main()
{ int x,y,z,m,n,w;

>

  printf("Give me an integer\n");
  scanf("%d",&x);

>

  y=x/10000;
  z=x%10000/1000;
  m=x%1000/100;
  n=x%100/10;
  w=x%10;

>

  printf("%d  %d  %d  %d  %d",y,z,m,n,w );

>

  return 0;}

>
Because an int can only hold a certain size of number.  The acutal sizeis
dependant on your platform.  You do know that it can hold at least as large
as a short, and no more than a long.  (Offhand it seems that your int is a
16-bit value, so the max number here is 32767.  int's are signed so the
full range would be -32768 - 32767).

I agree with your diagnosis. but it is still a little weird: I would
suspect that most developers today would either be working on a
platform where an integer is 32 bits or be sufficiently knowledgeable
that they would know the answer to the problem immediately.

/Peter

[osmium]

Re: Help! help!

"peter koch" wrote:

<quote>
On 25 Okt., 15:46, Andre Kostur <an...@kostur.n etwrote:

questions <mengqidhu...@y ahoo.cnwrote in news:5e98b478-4415-4d99-b4da-
31ee5e755...@e3 8g2000prn.googl egroups.com:
>
>
>
>
>

when I type 12456,it will give me "1 2 4 5 6".But when the integer
is too great ,for example ,if I type 78965,it will not give me "7 8
9 6 5",but give me a wrong result,why????

>

#include<stdio. h>
int main()
{ int x,y,z,m,n,w;

>

printf("Give me an integer\n");
scanf("%d",&x);

>

y=x/10000;
z=x%10000/1000;
m=x%1000/100;
n=x%100/10;
w=x%10;

>

printf("%d %d %d %d %d",y,z,m,n,w );

>

return 0;}

>
Because an int can only hold a certain size of number. The acutal size is
dependant on your platform. You do know that it can hold at least as large
as a short, and no more than a long. (Offhand it seems that your int is a
16-bit value, so the max number here is 32767. int's are signed so the
full range would be -32768 - 32767).

I agree with your diagnosis. but it is still a little weird: I would
suspect that most developers today would either be working on a
platform where an integer is 32 bits or be sufficiently knowledgeable
that they would know the answer to the problem immediately.
<end quote>

My guess would be that the person who asked the question was not, by any
stretch of the imagination, a developer.

[Default User]

Re: Help! help!

osmium wrote:

"peter koch" wrote:
>
<quote>

<end quote>

Did I mention OE Quotefix for fixing the quoting Google Groups problem
to you already? I know it came up once before, but I can't recall if it
was you.




Brian