• Kagamin <spam here.lot> Feb 21 2011
• "Robert Jacques" <sandford jhu.edu> Feb 21 2011

Kagamin <spam here.lot> writes:

bearophile Wrote:

 Jonathan M Davis:
 
 The thing is, of course, that actual equality sucks for floating point values. 


 So much, that some people have proposed to deprecate the normal FP equality.
MISRA-C disallows them. When you see a == among FP values is often a code smell.
 


Is it safe to assert that noone needs exact FP comparison?

"Robert Jacques" <sandford jhu.edu> writes:

On Mon, 21 Feb 2011 10:15:28 -0500, Kagamin <spam here.lot> wrote:

 bearophile Wrote:

 Jonathan M Davis:

 The thing is, of course, that actual equality sucks for floating  



 So much, that some people have proposed to deprecate the normal FP  
 equality. MISRA-C disallows them. When you see a == among FP values is  
 often a code smell.


 Is it safe to assert that noone needs exact FP comparison?


Nope. if(var == 0) is a common, important and valid test. To say nothing  
of testing for sentinel values.