Dart Exercises: Fundamentals

Let's think about it this way for a sec

This lesson doesn't teach anything new — it's a practice session where you'll revisit the variables, data types, operators, functions, if-else, loops, lists, and maps from the Basic chapter and actually write the code yourself. Instead of practicing each concept in isolation, these exercises mix them together so you learn to combine them. Working with them together like this will help you understand how to structure real-world logic. Make it a habit to predict the output before you run the code.

Exercises

Task 1: Declare variables of all four types — `int`, `double`, `String`, `bool` — and use string interpolation to print them all in a single sentence. Task 2: Write a function `celsiusToFahrenheit(double c)` that converts temperature using the formula `(c * 9/5) + 32`. Task 3: Use a `for` loop to collect only the even numbers from 1 to 20 into a list. Task 4: Build a `Map<String, int>` with student names as keys and scores as values, then use `if-else` combined with a loop to check each score — "Fail" for below 50, "Pass" for 50 and above.

• Can correctly declare all four variable types
• Can write a function with a parameter and a return type
• Can combine for loops and if-else on lists/maps

Code Example

// Task 1 skeleton
void main() {
  int age = 0; // TODO
  double height = 0.0; // TODO
  String name = ''; // TODO
  bool isStudent = true; // TODO
  print('$name is $age years old.');

  // Task 2
  print(celsiusToFahrenheit(30));

  // Task 3
  List<int> evens = [];
  // TODO: fill evens with even numbers from 1 to 20
  print(evens);

  // Task 4
  Map<String, int> scores = {
    'Aung': 45,
    'Su': 78,
    'Mya': 60,
  };
  // TODO: loop through scores and print Pass/Fail
}

double celsiusToFahrenheit(double c) {
  // TODO
  return 0.0;
}

Your console should print the student name/age sentence, the converted temperature, the list of even numbers, and then a Pass/Fail status for each student.