Dart num roundToDouble()
Syntax & Examples

num.roundToDouble() method

The `roundToDouble` method in Dart returns the double integer value closest to this number.

Syntax of num.roundToDouble()

The syntax of num.roundToDouble() method is:

 double roundToDouble()

This roundToDouble() method of num returns the double integer value closest to this.

Return Type

num.roundToDouble() returns value of type double.


✐ Examples

1 Rounding a decimal number

In this example,

  1. We create a num variable num1 with the value 4.2.
  2. We use the roundToDouble() method to round it to the nearest double integer value.
  3. We then print the result to standard output.

Dart Program

void main() {
  num num1 = 4.2;
  double roundedValue = num1.roundToDouble();
  print('Rounded value of $num1: $roundedValue');
}

Output

Rounded value of 4.2: 4

2 Rounding another decimal number

In this example,

  1. We create a num variable num1 with the value 4.8.
  2. We use the roundToDouble() method to round it to the nearest double integer value.
  3. We then print the result to standard output.

Dart Program

void main() {
  num num1 = 4.8;
  double roundedValue = num1.roundToDouble();
  print('Rounded value of $num1: $roundedValue');
}

Output

Rounded value of 4.8: 5

3 Rounding a negative decimal number

In this example,

  1. We create a num variable num1 with the value -3.2.
  2. We use the roundToDouble() method to round it to the nearest double integer value.
  3. We then print the result to standard output.

Dart Program

void main() {
  num num1 = -3.2;
  double roundedValue = num1.roundToDouble();
  print('Rounded value of $num1: $roundedValue');
}

Output

Rounded value of -3.2: -3

Summary

In this Dart tutorial, we learned about roundToDouble() method of num: the syntax and few working examples with output and detailed explanation for each example.