Division remainder %

[Keith Watford]

Up until now, I guess that I have only used integers when using % in my code.

 double remainder = 100 % 30;

works fine

double remainder = 100 % 30.1;

Compiler reports error '%' - illegal operation use

as does

double remainder = 100.00 % 30;

double remainder = 100 % 30.00;

So both values have to be an integer?

[Fernando Carreiro]

The usual mathematical definition of Modulo operations is usually only with Integers.

Some languages such as C# allow for the use of floating point calculations, however, assuming that MQL is built upon a Unix C foundation, it is most probably only valid for integers.

Unfortunately, the MQL documentation is not very clear on this point, plus it is misspelled as "Module" instead of "Modulo" or "Modulus".

[Alain Verleyen]

FMIC:

The usual mathematical definition of Modulo operations is usually only with Integers.

Some languages such as C# allow for the use of floating point calculations, however, assuming that MQL is built upon a Unix C foundation, it is most probably only valid for integers.

Unfortunately, the MQL documentation is not very clear on this point, plus it is misspelled as "Module" instead of "Modulo" or "Modulus".

Compiler seems very clear though. Only integers.

[Keith Watford]

Thanks FMIC,

I just wanted to make sure that it wasn't a bug.

I can easily sort out what I want to do with MathFloor, I think.

[Simon Gniadkowski]

GumRai:

Up until now, I guess that I have only used integers when using % in my code.

works fine

Compiler reports error '%' - illegal operation use

as does

So both values have to be an integer?

Have you tested MathMod() ? does it still have the same issues it had before ? https://www.mql5.com/en/forum/143605

[Keith Watford]

angevoyageur:
Compiler seems very clear though. Only integers.

"illegal operation use" wasn't very clear to me :(

I don't see anywhere that it says only integers

[Simon Gniadkowski]

GumRai:

"illegal operation use" wasn't very clear to me :(

I don't see anywhere that it says only integers

Nope, neither did I, I also looked through the documentation.

[Keith Watford]

RaptorUK:
Have you tested MathMod() ? does it still have the same issues it had before ? https://www.mql5.com/en/forum/143605

Thanks Raptor, I didn't even know about MathMod(), I will look into it.

I was thinking along the lines of

  double a = 1.5;
  double b = 3.1;
  double c = MathFloor(b/a);
  double remainder = b-c*a;
  Alert(remainder);

But of course that returns

0.100000000000001

[Gustavo Enedir Hennemann]

Keith Watford:

Thanks Raptor, I didn't even know about MathMod(), I will look into it.

I was thinking along the lines of

But of course that returns

0.100000000000001

You can use a variation of the below function (showed in https://www.mql5.com/en/articles/1561).

//+------------------------------------------------------------------+
//| correct comparison of 2 doubles                                  |
//+------------------------------------------------------------------+
bool CompareDoubles(double number1,double number2)
{
   if(NormalizeDouble(number1-number2,8)==0) return(true);
   else return(false);
}

[Keith Watford]

Gustavo Hennemann:

You can use a variation of the below function (showed in https://www.mql5.com/en/articles/1561).

Why are you replying to a topic that is over 4 years old?

[Gustavo Enedir Hennemann]

Keith Watford:

Why are you replying to a topic that is over 4 years old?

It looks like, I'm facing this situation but I didn't see the date of the topic. Is there any problem?