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Learn Dart: First Step to Flutter

Numbers

Explore Dart's numeric data types by learning about the num type, integers, and doubles. Understand how to declare and use number variables in Dart, including automatic conversion rules introduced in Dart 2.1. This lesson builds foundational skills essential for working with numeric data in Dart programming and Flutter development.

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The num Type

If we want a variable that has a number value, we will declare it using the num data type. The basic syntax is as follows:

Dart
// Method 1
num variableName = Number Literal
// Method 2
num variableName = Number Variable

Let’s look at an example.

Dart
main() {
  num firstNumber = 5;
  num secondNumber = 5.1;
  num thirdNumber = firstNumber;
  // Driver Code
  print(firstNumber);
  print(secondNumber);
  print(thirdNumber);
}

Dart numbers are further divided into two subtypes:

  1. integers (int)
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