Dart num toDouble()
Syntax & Examples

num.toDouble() method

The `toDouble` method in Dart converts this num to a double.

Syntax of num.toDouble()

The syntax of num.toDouble() method is:

 double toDouble()

This toDouble() method of num return this num as a double.

Return Type

num.toDouble() returns value of type double.


✐ Examples

1 Converting an integer to double

In this example,

  1. We create a num variable num1 with the value 4.
  2. We use the toDouble() method to convert it to a double.
  3. We then print the result to standard output.

Dart Program

void main() {
  num num1 = 4;
  double doubleValue = num1.toDouble();
  print('Double value of $num1: $doubleValue');
}

Output

Double value of 4: 4

2 Converting a decimal number to double

In this example,

  1. We create a num variable num1 with the value 3.14.
  2. We use the toDouble() method to convert it to a double.
  3. We then print the result to standard output.

Dart Program

void main() {
  num num1 = 3.14;
  double doubleValue = num1.toDouble();
  print('Double value of $num1: $doubleValue');
}

Output

Double value of 3.14: 3.14

3 Converting a negative integer to double

In this example,

  1. We create a num variable num1 with the value -10.
  2. We use the toDouble() method to convert it to a double.
  3. We then print the result to standard output.

Dart Program

void main() {
  num num1 = -10;
  double doubleValue = num1.toDouble();
  print('Double value of $num1: $doubleValue');
}

Output

Double value of -10: -10.0

Summary

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