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Testing floating point numbers

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# 8  
Old 02-12-2011
OK, Shamrock, I am curious. How would you solve the OPs problem using bitwise operators?
# 9  
Old 02-14-2011
Quote:
Originally Posted by fpmurphy
OK, Shamrock, I am curious. How would you solve the OPs problem using bitwise operators?
It appears to be my bad as I misunderstood what's needed. IMO the op wanted to determine if the fractional part of the float stored in memory is zero (easy todo with bitwise operators). After carefully reading the post it seems the OP wants to determine if the number input has a fractional part which is an entirely different matter.
# 10  
Old 02-14-2011
Thanks for the clarification, Shamrock. I was scratching my head wondering how you could safely do it using bitwise operators in a Korn or Bash shell.

BTW, you can safely manipulate IEEE Floating Point number bits in certain languages if you know what you are doing. For an example see Half-Precision Floating Point Format
# 11  
Old 02-14-2011
Quote:
Originally Posted by fpmurphy
Thanks for the clarification, Shamrock. I was scratching my head wondering how you could safely do it using bitwise operators in a Korn or Bash shell.
I wasnt thinking k/bash but a short piece of C code that tells if fractional part of the float stored in memory is zero...
Code:
read a floating point number
make an int* to address of the float
& with 0x007fffff tells if fractional part is zero

but after rereading the post I dont think this is what the op intends Smilie
Quote:
Originally Posted by fpmurphy
BTW, you can safely manipulate IEEE Floating Point number bits in certain languages if you know what you are doing. For an example see Half-Precision Floating Point Format
That's a very nice blog and I must admit until now i didnt even know the existence of half precision floats. So do you do a lot of graphics processing.
# 12  
Old 02-15-2011
Guys thanks a lot for new and interesting informations, I gaved up because I don't have any advanced knowledge so I printed result using floats.

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