CODEWITHSUNDEEP
dartflutter
Ishwar
Ishwar

Reputation: 6171

Delete digits after two decimal point without rounding its value in flutter?

var num1 = 10.12345678

What should i do with num1 to delete digits after two decimal point without rounding its value.
I need output as 10.12 

import 'package:flutter/material.dart';

void main() => runApp(MaterialApp(
      title: ' Delete digits after two decimal point ',
      theme: ThemeData(primarySwatch: Colors.blue),
      home: MyHome(),
    ));

class MyHome extends StatefulWidget {
  @override
  _MyHomeState createState() => _MyHomeState();
}

class _MyHomeState extends State<MyHome> {
    @override
  Widget build(BuildContext context) {

    var num1 = 10.12345678;
    print(num1); // I need output as 10.12

    return Container();
  }

}

Upvotes: 7

Views: 17714

Answers (8)

Sabarish Chungath
Sabarish Chungath

Reputation: 51

extension NoRoundingDecimal on double {
  String toDecimalAsFixed(int toDecimal) {
    var right;
    try {
      right = this.toString().split(".")[1].padRight(toDecimal, "0").substring(0, toDecimal);
    } catch (e) {
      right = "00";
    }
    var left = this.toString().split(".")[0];

    double number = double.parse(left + "." + right);
    return number.toStringAsFixed(toDecimal);
  }
}

Example1: double price = 71.999999999; print("number: ${price.toDecimalAsFixed(3)}");

Result: number: 71.999

Example2: double price = 71; print("number: ${price.toDecimalAsFixed(3)}");

Result: number: 71.000

Upvotes: -2

Sohel Mahmud
Sohel Mahmud

Reputation: 185

There is a simple solution to this problem.

double value = 17.56565656;
//as string
String formatted = value.toStringAsFixed(2); // 17.56
//as double
double formattedDouble = double.parse(formatted); //17.56

Upvotes: -1

Rasel Khan
Rasel Khan

Reputation: 4249

You can also try this ----> (0.2055).toStringAsFixed(2)

    var per = 0.2055;
    
    Text( "result view -> ${double.parse((per * 100).toStringAsFixed(2))}%",
            style: TextStyle(color: Colors.white, fontSize: 10)),

result value -> 
input -> 0.2055
output -> result view ->20.00

Upvotes: 0

Rakesh Lanjewar
Rakesh Lanjewar

Reputation: 663

String toFixed2DecimalPlaces(double data, {int decimalPlaces = 2}) {
  List<String> values = data.toString().split('.');
  if (values.length == 2 && values[0] != '0' && values[1].length >= decimalPlaces && decimalPlaces > 0)
    return values[0] + '.' + values[1].substring(0, decimalPlaces);
  else
    return data.toString();
}

Upvotes: 0

CopsOnRoad
CopsOnRoad

Reputation: 267594

If you want to round the number:

var num1 = 10.12345678;
var num2 = double.parse(num1.toStringAsFixed(2)); // num2 = 10.12

If you do NOT want to round the number:

Create this method:

double getNumber(double input, {int precision = 2}) => 
  double.parse('$input'.substring(0, '$input'.indexOf('.') + precision + 1));

Usage:

var input = 113.39999999999999;
var output = getNumber(input, precision: 1); // 113.9
var output = getNumber(input, precision: 2); // 113.99
var output = getNumber(input, precision: 3); // 113.999

Upvotes: 26

Fodil
Fodil

Reputation: 49

Some answers here did not work (top answer is round, not truncate). here is a way:

(n * 100).truncateToDouble()/100

Upvotes: 4

Javier Gonz&#225;lez
Javier Gonz&#225;lez

Reputation: 2095

if you want round the number use this.

 double mod = pow(10.0, places);
 return ((val * mod).round().toDouble() / mod);

if you just want to truncate use this.

return val - val % 0.01;

Upvotes: 1

Theo
Theo

Reputation: 69

You can use intl package (https://pub.dartlang.org/packages/intl#-installing-tab-)

var num1 = 10.12345678;
var f = new NumberFormat("###.0#", "en_US");
print(f.format(num1));

Upvotes: 5

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