Data Types in Dart Programming Language

Data Types in Dart Programming Language

Data Types in Dart Programming Language.

There are basically five data types in Dart programming language:

i) Integer Data Type (int)
ii) Double Data Type (double)
iii) String Data Type (String)
iv) Boolean Data Type (bool)
v) Dynamic Data Type (dynamic)

Note: int, double, String, bool and dynamic all are predefined variables for initializing respective data types in Dart programming language.

The first four data types are Strongly or Fundamental Typed variables i.e, these type of variable is known at compile time as like in Java, C#, etc.

And, the last fifth data type is Dynamically Typed variables i.e, the dynamically typed variables are known at the run time.

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var Keyword:

"var" is also a predefined keyword in Dart. In the Dart programming language "var" keyword is used to automatically understand the data type of the variable according to its initialization in the program.

For example: -

var varName = 100; // Here, varName is treated as integer.
var varName = 'Rohit Kumar'; //Here, varName is treated as String

Example of Dynamic Data Type:

void main() {
    dynamic varName = 100;
    print(varName);

    varName = 'Rohani Sinha';
    print(varName);
}

Output:
100
Rohani Sinha

Integer Data Type (int):

Integer Data Type is initialization with the help of  "int class" which is predefined class. "int class" is used to define an integer number.

Double Data Type (double):

Double Data Type is initialization with the help of  "double class". "double class" is used to define a double-precision floating-point number.

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String Data Type (String):

String Data Type is initialization with the help of  "String class". "String class" is used to define a String value.

Boolean Data Type (bool):

String Data Type is initialization with the help of  "String class". "String class" is used to define a String value.

Dynamic Data Type (dynamic):

Dynamic Data type of a variable is known at run time.

eg:
dynamic dya = 100; //Prints --> 100
dya = 'Rohani'; // Prints --> Rohani
dya = 10.1; //Prints --> 10.1


Program:

void main() {
  dynamic d = 100;
  print(d);

  d = 'Rohani';
  print(d);

  d = 10.1;
  print(d);

}

Output:
100 Rohani 10.1

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Dart Programming Language

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