Re: Unexpected results while working with floats

bintom wrote:
> float f = 139.4;
> if( f == 139.4)

  You are converting a 64-bit floating point number into a 32-bit one,
and then comparing the result to a 64-bit one. All bets are off.

  The difference with some other languages is that C++ doesn't try to
second-guess what you are really trying to do, and it does what and only
what you asked it to do.

  That the equality comparison is giving false is a result of the
underlying hardware and the floating point format used, not a flaw in
C++. The underlying hardware is dropping some bits from this value in
question when you are making the 64->32 bit conversion. When you try to
compare it to the original 64-bit value, the result will be different.