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Dart – Input & Output

In Dart, you can take input from the user by using .readLineSync() function from stdin class. To take input from the console you need to import a library, named dart:io from libraries of Dart.

Taking a String Input from a User

// importing dart:io file
import 'dart:io';
 
void main()
{
    print("Whats your name pal?");
    // Reading user Input
    String name = stdin.readLineSync();
 
    // Printing the name
    print("Hello, $name! \n, Nice to meet you!");
}

Input: Fallenblood

Output:
Whats your name pal?
Hello, Fallenblood! 
Nice to meet you!

Taking Int as Input

// importing dart:io file
import 'dart:io';

void main()
{
    print("Enter your age!");
    // Reading user Input
    int age = int.parse(stdin.readLineSync());
 
    // Printing 
    print("Your age is, $age);
}

Input: 21

Output:
Enter your age!
Your age is, 21

NOTE: stdin.readLineSync takes input as a string, in order to get an integer or whole number you need to convert a string into an integer by int.parse() function.

Taking Double as Input

// importing dart:io file
import 'dart:io';

void main()
{
    print("Enter a decimal number!");
    // Reading user Input
    int decimalnum = double.parse(stdin.readLineSync());
 
    // Printing 
    print(decimalnum);
}

Input: 2.1

Output:
2.1

NOTE: stdin.readLineSync takes input as a string, in order to get a decimal number you need to convert a string into a double by double.parse() function.

OUTPUT

In Dart, you can print something by print function.

print("YO! I can print anything , not everything!");

In the next lesson, you will learn about Comments.

About Post Author

Sagar Kushwaha

sumitkushwaha7080@gmail.com

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