How to round a number in dart?

Question

I want to round a double.

Double x = 5.56753;
x.toStringAsFixed(2);

When i put this, it gives 5.57000. But i want to get 5.57. How do i get it?

Chanaka Weerasinghe · Accepted Answer · 2021-03-29T12:00:08.637

38

there is num class contained function round():

 double numberToRound = 5.56753;
    print(numberToRound.round()); 
    //prints 6

If you want decimals

double n = num.parse(numberToRound.toStringAsFixed(2));
  print(n);
  //prints 5.57

edited Mar 29 '21 at 12:00

answered Jul 12 '19 at 07:37

1

At the time of posting this comment (i.e. 28 March 2021) this solution still violated the well-known "***numbers ending with 5***" rounding rule. See this answer => [ https://stackoverflow.com/a/66840734/3002719 ] for a DART solution that adheres to the number 5 round rule. – SilSur Mar 28 '21 at 11:30

score 9 · Answer 2 · answered Jul 12 '19 at 07:17

9

Rounding won't work in your case because docs says:

So it will give 6 instead 5.57.

Your solution:

double x = 5.56753;
String roundedX = x.toStringAsFixed(2);
print(roundedX);

answered Jul 12 '19 at 07:17

Mehmet Esen

He can not accept as his rep is low – RonTLV Jul 12 '19 at 07:47
Anybody can accept - upvotes require 15 reputation, but accepting can happen with 1 reputation. – Wai Ha Lee Jul 12 '19 at 12:01

2 Answers2