User Input

User input is a fundamental aspect of interaction between users and software. In Dart, it varies depending on the type of application being used. It can be a web application, a Flutter application, or a console application. Dart provides a variety of tools and libraries to manage user input effectively.

Syntax

import 'dart:io';

void main(){
  String? input = stdin.readLineSync();
}

Example

The below code shows the implementation of user input in Dart. It inputs a value as an age from the user and generates an output:

import 'dart:io';
void main() {
  stdout.write('Enter your age: ');
  String? input = stdin.readLineSync();
  if (input != null) {
    int age = int.parse(input);
    print('Dear Friend, You are $age years old.');
  } else {
    print('Invalid input.');
  }
}

The above code produces the following output:

Enter your age: 21
Dear Friend, You are 21 years old.