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User Input & Output 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.

Note

You won’t be able to take input from users using dartpad. You need to run a program from your computer.

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}");
}

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}");
}

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");
}