How to get fractional part in dart

Question

is there any way to print out the fractional part of a double,

My double number,

4734.602654867

I want only 6026 from it.

Answer 1

There is a truncate() function for double type which returns the integer part discarding the fractional part. We can subtract that from the original double to get the fraction.

double myDouble = 4734.602654867;
double fraction = myDouble - myDouble.truncate();
print(fraction);                                   // --> prints 0.602654867

Edit: If we want 4 digits specifically from the fractional part, we can do this..

int result = (fraction*10000).truncate();  
print(result);                                    // --> prints 6026

To do all this one line, we can do it like this..

int result = ((myDouble - myDouble.truncate())*10000).truncate(); // <-- 6026

Answer 2

You can do that using split()

Like this..

var s = 4734.602654867;
var a = s.toString().split('.')[1]. substring(0,4); // here a = 6026

Hope it solves your issue..

Answer 3

Something like

import 'dart:math' show pow;
var number = 4734.602654867;
var wantedDigits = 4;
var fraction = (number % 1 * pow(10, wantedDigits)).floor();
print(fraction);

should work.

Dartpad example.