C++ Convert from int to long int strange act

Question

1.00/5 (1 vote)

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I have custom type called cell and when i try to convert from int to cell i got this strange results:

C++

typedef long int  int32_t;
typedef int32_t   cell;

cell foo()
{
 int xz;
 xz = 150;
 return xz;
}

Expected: 150

Output: 32736 <- why ??? and not 150 as expected.

I hope you will understand this.

Posted 11-Apr-13 9:20am

125Azazelo

Updated 11-Apr-13 9:23am

Kenneth Haugland

v2

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Comments

CPallini 11-Apr-13 15:32pm

Your code does not produce output, how do you check it?

125Azazelo 11-Apr-13 15:39pm

Outside this code. I use print(). And i know it shod be conversion between type something like
return (cell)xz; but i do not know why this bug heaped. Long int shod be large inapt for int to be stored in whit out conversion.

Sergey Alexandrovich Kryukov 11-Apr-13 16:04pm

Please, exact code sample, up to the point you got 32736. Use "improve question".
—SA

2 solutions

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Sergey Alexandrovich Kryukov · Accepted Answer · 2013-04-11T09:35:00

Solution 1

No, it should return 150 (unless you also redefined int and long int in some weird way :-)).

(By the way, hot did you obtain this output? You did not show the code calling foo(), the problem could be there…)

—SA

Posted 11-Apr-13 9:35am

Sergey Alexandrovich Kryukov

Comments

125Azazelo 11-Apr-13 16:01pm

Yes i was made a strange define whit int. Thank you for point this.

CPallini · Accepted Answer · 2013-04-11T09:39:00

Solution 2

The following code

typedef long int  int32_t;
typedef int32_t   cell;
#include <stdio.h>
cell foo()
{
 int xz;
 xz = 150;
 return xz;
}

int main()
{
  printf("%ld\n", (long)foo());  /* long int ! */
  return 0;
}

outputs:
150

Posted 11-Apr-13 9:39am

CPallini

Updated 11-Apr-13 10:36am

v2

Comments

125Azazelo 11-Apr-13 16:02pm

Thank you for POC i think i got out of my mind.

Sergey Alexandrovich Kryukov 11-Apr-13 16:04pm

Sure, a 5, for more complete and definitive sample. However, I have no idea what could OP do to obtain 32736, do you (I see that you asked OP)?
—SA

CPallini 11-Apr-13 16:26pm

I have no idea (though 32736 is interesting).
BTW Thank you.

Sergey Alexandrovich Kryukov 11-Apr-13 17:21pm

:-)

CPallini 12-Apr-13 4:07am

@merano: thank you for fixing the mistake.