User Input in Dart

User Input In Dart

Instead of writing hard-coded values, you can give input to the computer. It will make your program more dynamic. You must import package import 'dart:io'; for user input.

String User Input

They are used for storing textual user input. If you want to keep values like somebody’s name, address, description, etc., you can take string input from the user.

import 'dart:io';

void main() {
  print("Enter name:");
  String? name  = stdin.readLineSync();
  print("The entered name is ${name}");
}

Enter name:
Raj Sharma
The entered name is Raj Sharma

Integer User Input

You can take integer input to get a numeric value from the user without the decimal point. E.g. 10, 100, -800 etc.

import 'dart:io';

void main() {
  print("Enter number:");
  int? number = int.parse(stdin.readLineSync()!);
  print("The entered number is ${number}");
}

Enter number:
50
The entered number is 50

Floating Point User Input

You can use float input if you want to get a numeric value from the user with the decimal point. E.g. 10.5, 100.5, -800.9 etc.

import 'dart:io';

void main() {
  print("Enter a floating number:");
  double number = double.parse(stdin.readLineSync()!);
  print("The entered num is $number");
}

Enter a floating number:
55.5
The entered num is 55.5

Video

Watch our video on the user input in Dart.