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Output with Debug.Log

Learn to print to the console with Debug.Log and watch values.

Debug.Log and the Console Window

In Unity, Debug.Log is used to verify code execution and monitor variables while the game runs. All messages sent via Debug.Log are printed to the Console window of the Unity editor. This method is the developer's most crucial tool for testing mechanics and diagnosing bugs.

Debug.Log("Oyun basariyla baslatildi!");

Double-clicking a message in the Console window jumps directly to the line of code that triggered it.

Warnings and Error Messages

You can send not only informational messages to the console, but also warnings and errors tailored to specific situations. Use Debug.LogWarning with a yellow icon for potential issues, and Debug.LogError with a red icon for critical failures. You can concatenate variable values using the + operator.

int can = 15;
Debug.Log("Kalan can: " + can);
Debug.LogWarning("Can degeri cok dustu!");

Different log types can be filtered in the Console window, making problem detection straightforward.

Practice Print variable with Debug.Log

Inside the Main method, use Debug.Log to print the expression "Puan: " + score to the console.

Starter code

Player.cs
using System;

public static class Debug
{
    public static void Log(object message) => Console.WriteLine(message);
}

public class Program
{
    public static void Main()
    {
        int score = 50;
        // Debug.Log ile yazdir
    }
}

Sample solution

Player.cs
using System;

public static class Debug
{
    public static void Log(object message) => Console.WriteLine(message);
}

public class Program
{
    public static void Main()
    {
        int score = 50;
        Debug.Log("Puan: " + score);
    }
}

Expected output

Puan: 50

Questions and answers

Review the lesson questions together with their answers. To test yourself, solve the lesson interactively.

1 In which editor window are messages printed with Debug.Log() listed in Unity?

  • Console Correct answer
  • Hierarchy
  • Inspector
  • Project

Explanation: In Unity, Debug.Log, Debug.LogWarning, and Debug.LogError outputs are displayed in the Console window.

2 Printing info to console

Question 
Debug.____("Oyun basladi!");
Answer 
Debug.Log("Oyun basladi!");

Explanation: In Unity, the Log method of the Debug class is used to write general informational messages to the console.

3 Log types and purposes

Term Meaning
Debug.Log Prints a standard informational message
Debug.LogWarning Prints a yellow warning message
Debug.LogError Prints a red critical error message
Console penceresi Where logs and compile errors are listed

All lessons in Beginner

1 What is game development?

  1. Intro to game development
  2. Game engines
  3. 2D and 3D games
  4. The game loop
  5. The scene concept
  6. Summary - Game dev fundamentals

2 Unity setup

  1. Installing Unity Hub
  2. Creating your first project
  3. The editor interface
  4. Toolbar and playback
  5. Saving the project
  6. Summary - Unity setup

3 First scene project

  1. Project overview
  2. Camera and light
  3. Your first cube in the scene
  4. Adding a material
  5. Testing in Play mode
  6. Summary - First scene

4 The GameObject concept

  1. What is a GameObject?
  2. Components
  3. The Hierarchy window
  4. Editing with the Inspector
  5. Tags and Layers
  6. Summary - GameObject

5 C# script basics

  1. Your first C# script
  2. using and namespace
  3. Class structure
  4. Variables and types
  5. Output with Debug.Log
  6. Summary - C# basics

6 MonoBehaviour

  1. What is MonoBehaviour?
  2. The Start method
  3. The Update method
  4. Awake vs Start
  5. SerializeField and public
  6. Summary - MonoBehaviour

7 Transform

  1. What is Transform?
  2. Changing position
  3. Moving with Translate
  4. Changing rotation
  5. Local vs world space
  6. Summary - Transform

8 Input

  1. The Input class
  2. Axis input
  3. Mouse input
  4. The new Input System
  5. Movement vector
  6. Summary - Input

9 Physics (Rigidbody/Collider)

  1. What is a Rigidbody?
  2. What is a Collider?
  3. Applying force with AddForce
  4. Collision events
  5. Trigger events
  6. Summary - Physics

10 2D Sprite

  1. What is a Sprite?
  2. SpriteRenderer
  3. Sprite import settings
  4. Sprite sorting
  5. Preparing sprite animation
  6. Summary - 2D Sprite

11 Godot basics

  1. The Godot editor
  2. A new project
  3. The scene tree
  4. The Node concept
  5. Saving the project
  6. Summary - Godot basics

12 GDScript

  1. What is GDScript?
  2. extends and variables
  3. Function definition
  4. Output with print
  5. Type hints
  6. Summary - GDScript

13 Node and Scene

  1. Node2D and Sprite2D
  2. Saving a scene
  3. Scene instance
  4. The _ready method
  5. The _process method
  6. Summary - Node and Scene

14 Beginner final

  1. Challenge 1: Print a score
  2. Challenge 2: Movement vector
  3. Challenge 3: Godot ready
  4. Challenge 4: Collision log
  5. Challenge 5: Final synthesis