Int, Frac functions and NaN value

[Kryvich 174]

Something went wrong with system functions Int and Frac in Delphi 12, Win32 platform.

 

At runtime, the result of the expression Frac(1.9) can be either 0.9 (as expected) or 0 or 0.89. I couldn't determine what affects this.

 

Interestingly, in the Evaluate/Modify window, the expressions Frac(1.9) and Int(1.9) always return -NAN, whatever that means.

 

 

Has anyone encountered these issues?

 

As a temporary workaround, I used x-Trunc(x) instead of Frac(x).

Edited Thursday at 08:54 PM by Kryvich

[David Heffernan 2417]

This is just a debugger issue, you shouldn't change your code because of this 

[DelphiUdIT 225]

With 12.3 Enterprise I cannot replicate any of these issues. Not even with evaluation panel.

 

[Kryvich 174]

@David Heffernan This is evident not only in the debugger, but also at runtime. That's the question. Processor - AMD Ryzen 5 3600.

@DelphiUdIT That's good! I have the community edition, its version is 29.0.51961.7529, Delphi 12 Update 1.

 

[David Heffernan 2417]

3 hours ago, Kryvich said:

@David Heffernan This is evident not only in the debugger, but also at runtime. That's the question. Processor - AMD Ryzen 5 3600.

@DelphiUdIT That's good! I have the community edition, its version is 29.0.51961.7529, Delphi 12 Update 1.

 

Then please provide a complete but minimal reproduction.