Round down double mql5

[Mirco]

Hello guys,

how can i round a double to lowest number?

I have issue for lotsize in martingale 1.5

Starting from 0.01 i have

0.01 * 1,5 = 0.015 (i want round down to 0.01)

[Fernando Carreiro]

Please take the time to search and read the documentation before posting ...

• Documentation on MQL5: Math Functions

MathCeil	Returns integer numeric value closest from above
MathFloor	Returns integer numeric value closest from below
MathRound	Rounds of a value to the nearest integer

[Mirco]

Hello,

thanks for reply but i saw this one and dont fit because Is for integer, i Need It for double

[Fernando Carreiro]

Mirco #: thanks for reply but i saw this one and dont fit because Is for integer, i Need It for double

It is basic maths ...

0.01 * MathFloor( 1.5 )

[Mirco]

I dont need in this way, i do and example to be clear

Lotsize 0.01 martingale 1.5

With Mql4 i have this steps as default Round the double value

0.01

0.01

0.02

0.03

 I Need to have the same for mql5

[Fernando Carreiro]

Mirco #: I dont need in this way, i do and example to be clear.

Lotsize 0.01 martingale 1.5

With Mql4 i have this steps as default Round the double value

0.01, 0.01, 0.02, 0.03

 I Need to have the same for mql5

You have not explained anything clearly at all.

Besides, the function works exactly the same on both MQL4 and MQL5.

[Fernando Carreiro]

void OnStart() {
   double dbSeed  = 1.0,
          dbRatio = 1.5,
          dbStep  = 0.01;
   for( int i = 0; i < 10; i++ ) {
      PrintFormat( "Lots: %.2f (Value: %.6f)", MathFloor( dbSeed ) * dbStep, dbSeed );
      dbSeed *= dbRatio;
   };
};

Lots: 0.01 (Value: 1.000000)
Lots: 0.01 (Value: 1.500000)
Lots: 0.02 (Value: 2.250000)
Lots: 0.03 (Value: 3.375000)
Lots: 0.05 (Value: 5.062500)
Lots: 0.07 (Value: 7.593750)
Lots: 0.11 (Value: 11.390625)
Lots: 0.17 (Value: 17.085938)
Lots: 0.25 (Value: 25.628906)
Lots: 0.38 (Value: 38.443359)