Dart User Input ?

💙 Dart Basics: Taking User Input

User input is an important part of programming. It allows a program to receive information from the user and work with that information.

In Dart, we commonly use stdin.readLineSync() from the dart:io library to take input from the console.

📌 Basic Example

import 'dart:io';

void main() {
  print("Enter your name:");

  String? name = stdin.readLineSync();

  print("Hello, $name!");
}

Here:

• stdin.readLineSync() reads input from the user.
• String? means the input can be a String or null.
• $name is used to display the entered value.

📌 Taking Number Input

stdin.readLineSync() returns a string, so we need to convert it when we want a number.

import 'dart:io';

void main() {
  print("Enter your age:");

  int age = int.parse(stdin.readLineSync()!);

  print("Your age is $age");
}

For decimal numbers, we can use double.parse():

double salary = double.parse(stdin.readLineSync()!);

💡 Key Takeaway

The basic flow is:

User Input → Read as String → Convert if Needed → Use the Value

Understanding user input helps build a strong foundation in Dart before moving into more advanced programming concepts.

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