Menu

Tech

English

Integers (int)

Part of the Fundamentals section of Coddy's Dart journey — lesson 7 of 94.

Integers (int type) are whole numbers without decimals. Create them with:

void main() {
  int age = 25;
  print(age);
}

Integers don't need quotation marks and can be used in calculations:

void main() {
  int score = 10;
  print(score);
  
  // Increase the score
  score = 15;
  print(score);
  
  // Create another integer
  int bonus = 5;
  
  // Combine integers
  int totalScore = score + bonus;
  print(totalScore);
}

Challenge

Beginner

Create a program that demonstrates the use of integer variables in Dart:

Create an integer variable named age and assign it the value 25
Create another integer variable named yearOfBirth and assign it the value 1998
Create a third integer variable named currentYear and assign it the value 2023
Print all three variables on separate lines with descriptive labels

Try it yourself

void main() {
  // Declare your integer variables here
  int age = ?;
  int yearOfBirth = ?;
  int currentYear = ?;
  
  // Print the variables with labels
  print("Age: $age");
  print("Year of birth: $yearOfBirth");
  print("Current year: $currentYear");
}

Test yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction to Dart

What is Dart?The main Function Printing Output Code Comments

4Operators Part 2

Comparison Operators Logical AND Logical OR Logical NOT Type Test Operators Recap - Making Comparisons

7Working with Strings

String Concatenation String Interpolation Multi-line Strings String Properties Basic String Methods

10Collections - Maps Basics

What are Maps?Creating a Map Accessing Values by Key Key-Value Pairs Getting Map Size Getting Keys Getting Values Checking if a Key Exists

13Null Safety In Depth

Understanding Null Nullable Types Non-Nullable Types Null Assertion Operator Late Initialization Recap - Handling Null Safely

16Fundamentals Challenges

Challenge: List of calculation Challenge: Sum of numbers Challenge: Find product

3Operators Part 1

Arithmetic Operators Integer Division Modulo Operator Increment and Decrement Assignment Shortcuts Recap - Simple Calculations

6Control Flow - Decision Making

The 'if' Statement The 'else' Statement The 'else if' Statement Recap - Simple Decisions Nested 'if' Statements The 'switch' Statement

9Collections - Lists Basics

What are Lists?Creating a List Accessing by Index Getting List Length Adding Elements Removing Elements Checking if a List is Empty Iterating Over a List

12Functions Advanced

Optional Positional Parameters Named Parameters Required Named Parameters Default Parameter Values Recap - Function Parameters

15Project: Simple Calculator

Setting Up Declaring Number

Project lesson

Creating an Operation

Project lesson

Performing Calculation

Project lesson

Displaying Result

Project lesson