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

Question

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();
}
}

Answer 1

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

Answer 2

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));

Answer 3

Some answers here did not work (top answer is round, not truncate).
here is a way:
(n * 100).truncateToDouble()/100

Answer 4

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;

Answer 5

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();
}

Answer 6

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

Answer 7

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

Answer 8

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