ERROR: MathRound + Windows Server 2019 + MetaTrader 4 = not working

[Vladislav Andruschenko]

I found that the MathRound function does not work correctly in the MT4 terminal (latest version 1421) on Windows Server 2019

double Lot2=0.305;

if(SymbolInfoDouble(Symbol(),SYMBOL_VOLUME_STEP)!=0)
      Lot2=MathMin(MathMax(MathRound(Lot2/SymbolInfoDouble(Symbol(),SYMBOL_VOLUME_STEP))*SymbolInfoDouble(Symbol(),SYMBOL_VOLUME_STEP),SymbolInfoDouble(Symbol(),SYMBOL_VOLUME_MIN)),SymbolInfoDouble(Symbol(),SYMBOL_VOLUME_MAX));

Print(" Round="+MathRound(Lot2/SymbolInfoDouble(Symbol(),SYMBOL_VOLUME_STEP)));

Results:

Round=0 

I used different functions, but the problem is only on Server 2019.

MathCeil also doesn't work.

The same code on Standard Windows 11 works without problems.

Round=30

Solution: Now I use (int) instead of Math Round and everything works correctly.

if(SymbolInfoDouble(Symbol(),SYMBOL_VOLUME_STEP)!=0)
      Lot2=MathMin(MathMax((int)(Lot2/SymbolInfoDouble(Symbol(),SYMBOL_VOLUME_STEP))*SymbolInfoDouble(Symbol(),SYMBOL_VOLUME_STEP),SymbolInfoDouble(Symbol(),SYMBOL_VOLUME_MIN)),SymbolInfoDouble(Symbol(),SYMBOL_VOLUME_MAX));

The problem is only on Windows Server 2019

[Mikkelsen]

same as here:

https://www.mql5.com/en/forum/470651#comment_54141486

[Ilyas]

We are found a bug in the CRT function floor, when it fallback execution from SSE4.1 to SSE2 and CRT is linked as static library (/MT)

CRT function floor doesn't work properly if your CPU doesn't support SSE4.1

[Vladislav Andruschenko]

Ilyas #:

We are found a bug in the CRT function floor, when it fallback execution from SSE4.1 to SSE2 and CRT is linked as static library (/MT)

CRT function floor doesn't work properly if your CPU doesn't support SSE4.1

Thank you. I don't use servers with old computers. But clients from the market do. They use dedicated servers and get this error en masse.

[Ilyas]

Vladislav Andruschenko #:
Thank you. I don't use servers with old computers. But clients from the market do. They use dedicated servers and get this error en masse.

Lets see what MS will say: https://developercommunity.visualstudio.com/t/function-floor-does-not-properly-work-on/10778831?

We will make custom floor to bypass this bug.