.... but floats aren't promoted to integers.

It can get a bit moot: 
D:\>perl -MDevel::Peek -le "$x = (2 ** 53) - 1; Dump $x; $x++; Dump $x
+; $x++; Dump $x; $x++; Dump $x;"
SV = NV(0x28e88c5a2f8) at 0x28e88c5a310
  REFCNT = 1
  FLAGS = (NOK,pNOK)
  NV = 9007199254740991
SV = PVNV(0x28e88c24e10) at 0x28e88c5a310
  REFCNT = 1
  FLAGS = (IOK,pIOK)
  IV = 9007199254740992
  NV = 9007199254740991
  PV = 0
SV = PVNV(0x28e88c24e10) at 0x28e88c5a310
  REFCNT = 1
  FLAGS = (IOK,pIOK)
  IV = 9007199254740993
  NV = 9007199254740991
  PV = 0
SV = PVNV(0x28e88c24e10) at 0x28e88c5a310
  REFCNT = 1
  FLAGS = (IOK,pIOK)
  IV = 9007199254740994
  NV = 9007199254740991
  PV = 0

[download]
The fact that the flags change from (NOK,pNOK) to (IOK,pIOK) suggests to me that the NV has been promoted to an IV.
Or does the fact that both the IV and NV slots have been filled suggest that it's neither an IV nor an NV. Or maybe that suggests that it's both ? ... I don't know.

Anyway, I'm not looking for an argument. It's just one of those things that I find a little mysterious.

Other differences between floats and ints is the existence of inifinity, NaN and -0

One of my beefs with Math::BigInt is that it has a NaN and an inf: 
D:\>perl -MMath::BigInt -le "$x = Math::BigInt->new(2.3); print $x; pr
+int ref($x);"
NaN
Math::BigInt

D:\>perl -MMath::BigInt -le "$x = Math::BigInt->new(1) / 0; print $x; 
+print ref($x);"
inf
Math::BigInt

[download]
I don't regard it as all that important, but it probably shouldn't do that.
I couldn't quickly get it to provide a "-0", but I did get the following weirdness: 
D:\>perl -MMath::BigInt -le "$x = Math::BigInt->new(1) / inf; print $x
+; print ref($x);"
0
Math::BigInt

D:\>perl -MMath::BigInt -le "$x = Math::BigInt->new(1) / -inf; print $
+x; print ref($x);"
-1
Math::BigInt

[download]
Cheers,
Rob

In reply to Re^5: Largest integer in 64-bit perl by syphilis
in thread Largest integer in 64-bit perl by harangzsolt33

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