Re: integer to string

[Manfred Hanke <Manfred.Hanke@xxxxxxxxxxxxxxxxxxxxxxxxxx>]

Hi Frank,

> How can an integer of more than 10 digits be converted to a string? 
>     string(123456789012)   -1097262572
>     string(12345678901)    -539222987
>     string(1234567890)     1234567890

The problem is not the string conversion, but the integer representation 
itself. The literal constant 123456789012 does not define what you think 
it should, because the underlying Integer_Type is not capable of 
carrying such a large number.

It seems that you're not using a very recent version of S-Lang (<2.2), 
because S-Lang >= pre2.2.0-39 issues a warning in this case:
> Integer overflow detected: too many digits 

If you really have to deal with such integer numbers, you may consider 
to use the LLong_Type, which is declared in literal constants with an 
LL-postfix:
   string(123456789012LL)  ->  "123456789012"
However, there is also a limit for this data type, which is 2^63 on my 
system:
  variable a = 9223372036854775807LL;
  string(a);  % "9223372036854775807"
  a++;
  string(a);  % "-9223372036854775808"

Admittedly, one can still go for unsigned long long, reaching to 2^64...
  variable a = 18446744073709551615ULL;
  string(a);  % "18446744073709551615"
  a++;
  string(a);  % "0"

Cheers,

Manfred

jed version: 0.99.19/Unix
S-Lang version: 2.2.2

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