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Learn Dart: First Step to Flutter

Numbers

Numbers are a fundamental data type in programming, with Dart utilizing the general `num` type for numeric values. Dart further categorizes numbers into two subtypes: `int` for whole numbers and `double` for decimal values. While `num` is versatile, using `int` and `double` is preferred for clarity and type safety. Integers are strictly whole numbers, while doubles can represent decimal values and scientific notation. Dart also automatically converts integers to doubles when necessary, ensuring seamless handling of numeric types in applications. Understanding these distinctions aids in writing precise and predictable code.

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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: ...