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how to round double variables?

  • #1
  • First Post: Feb 21, 2016 12:16pm Feb 21, 2016 12:16pm
I have a double variable with three figures after the dot.
how can I make it round,
for example:
1.124 = 1.120
1.126 = 1.130
  • #2
  • Feb 21, 2016 12:29pm Feb 21, 2016 12:29pm
Quoting quiet
I have a double variable with three figures after the dot. how can I make it round, for example: 1.124 = 1.120 1.126 = 1.130
quiet-
https://docs.mql4.com/math/mathround
  • #3
  • Feb 21, 2016 12:39pm Feb 21, 2016 12:39pm
Quoting cyber1
{quote} quiet- https://docs.mql4.com/math/mathround
thank you cyber
  • #4
  • Feb 21, 2016 1:11pm Feb 21, 2016 1:11pm
Quoting quiet
{quote} thank you cyber
but
i want to round just the last figure
and this function rounds till the integer , from 1.123 to 1.0
  • #5
  • Feb 21, 2016 1:20pm Feb 21, 2016 1:20pm
Quoting quiet
{quote} but i want to round just the last figure and this function rounds till the integer , from 1.123 to 1.0
quiet-
on that same page is MathCell() and MathFloor()

in addition you can use DoubleToStr()
https://docs.mql4.com/convert/doubletostr

if none of those work can you give an example of the result you are expecting
  • #6
  • Feb 21, 2016 3:03pm Feb 21, 2016 3:03pm
Quoting quiet
I have a double variable with three figures after the dot. how can I make it round, for example: 1.124 = 1.120 1.126 = 1.130
NormalizeDouble()
  • #7
  • Feb 21, 2016 3:41pm Feb 21, 2016 3:41pm
Quoting cyber1
{quote} quiet- on that same page is MathCell() and MathFloor() in addition you can use DoubleToStr() https://docs.mql4.com/convert/doubletostr if none of those work can you give an example of the result you are expecting
mathcell() doesnt rounds, and I dont understand how the doubltostring() helps.

for now I think to do so:
Variable=1.123;
Variable=Variable*100;
Variable=MathRound(Variable);
Variable= Variable/100;
  • #8
  • Feb 21, 2016 3:43pm Feb 21, 2016 3:43pm
Quoting honestknave
{quote} NormalizeDouble()
it is just removes figurs, not round them
  • #9
  • Feb 21, 2016 6:08pm Feb 21, 2016 6:08pm
Quoting quiet
{quote} it is just removes figurs, not round them
quiet-
Actually thats not accurate.
Use DoubleToStr() if the result will be used in a string
use NormalizeDouble() if using in a calculation
both round to the nearest decimal

Inserted Code
double Variable=1.12348934;
Print("DoubleToString:"+DoubleToString(Variable,2));
Print("NormalizeDouble:"+NormalizeDouble(Variable,2));
Result
DoubleToString:1.12
NormalizeDouble:1.12

now change the variable to closer to 1.3 and use 3 as number of digits to right of decimal point
Inserted Code
double Variable=1.1299999;
Print("DoubleToString:"+DoubleToString(Variable,3));
Print("NormalizeDouble:"+NormalizeDouble(Variable,3));
Result
DoubleToString:1.130
NormalizeDouble:1.13
  • #10
  • Feb 21, 2016 6:11pm Feb 21, 2016 6:11pm
Quoting quiet
{quote} but i want to round just the last figure and this function rounds till the integer , from 1.123 to 1.0
Multiply by 100, do the rounding, then divide by 100 and you will have 2 digits to the right of the decimal.

GREEN pips
  • #11
  • Feb 22, 2016 2:03am Feb 22, 2016 2:03am
Keep things simple. If you want to round a floating point number, use the native function which is NormalizeDouble().

Inserted Code
   double valA = 1.12837462;
   printf("Before NormalizeDouble, valA is %.8f",valA);
   valA = NormalizeDouble(valA, 2);
   printf("After NormalizeDouble, valA is %.8f",valA);

Attached Image
  • #12
  • Feb 22, 2016 2:13am Feb 22, 2016 2:13am
thank you all
  • #13
  • Last Post: Nov 18, 2022 12:20am Nov 18, 2022 12:20am
Used in mql4 language NormalizeDouble() function sometimes does not work properly. You can see in the example below.
Inserted Code
double value=0.9731300000000001;
double value2=NormalizeDouble(value,Digits);
Print(value2);
As a result, although I want to get the result of 0.97313, the result is 0.9731300000000001. How can I fix.

Inserted Code
double Yuvarla(double Sayi)
{
double _sayi1=MathRound(Sayi*MathPow(10,Digits));
double _sayi2=_sayi1/MathPow(10,Rakam);
return _sayi2;
}

this method didn't work either
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