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Constants

Part of the Fundamentals section of Coddy's C# journey. Lesson 11 of 69.

A constant is a special type of variable whose value cannot be changed once it is initialized. To declare a constant, use the const keyword followed by the data type and the constant name:

const int MaxValue = 100;
const double Pi = 3.14159;
const string Message = "Hello, Coddy!";

In these examples, MaxValue, Pi, and Message are constants that cannot be modified after initialization. Attempting to change their values will result in a compilation error.

Challenge

Beginner

Write a program that declares and initializes the following constants:

A constant named MaxQuantity with the value 50.
A constant named CompanyName with the value "Coddy Inc.".

Try it yourself

using System;

public class Program {
    public static void Main(string[] args) {
        // Declare constants here
        
        
        // Don't change below
        Console.WriteLine("Max Quantity: " + MaxQuantity);
        Console.WriteLine("Company Name: " + CompanyName);
    }
}

Test yourself

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

All lessons in Fundamentals

1Introduction

C#Hello World!Comments Basic Program Structure

4Operators Part 1

Arithmetic Operators Modulo Operator Increment/Decrement Post Increment/Decrement Arithmetic Shortcuts

7Basic IO

Basic Output String Interpolation Reading Input Parse Recap - Till 120 Recap - True or False

10Methods (Functions)

Declaring Methods Method Parameters Return Types Optional Parameters Recap - Validation Function Void Methods

13Iterating Over Collections

Using For Loop Foreach Loop Common Array Operations

2Variables Part 1

Numbers Char String Boolean Type Declaration

5Operators Part 2

Comparison Operators Logical Operators Part 1 Logical Operators Part 2 Recap - Simple Logic Logical Operators Part 3

8Calculator App

Welcome Message Getting Numbers

Project lesson

Basic Operations

Project lesson

Formatted Output

Project lesson

11Arrays Basics

Declaring Arrays Accessing Elements Modifying Arrays Array Methods Recap - Product Array Edit Recap - Reversed Array

14Final Challenges

Number Pattern Pattern Finder Student Grade Calculator

3Variables Part 2

VarConstantsNaming Conventions Recap - Initialize Variables Type Casting

6Decision Making

If Statement If - Else Switch Statement Ternary Operator Recap - If Else Nested If - Else

9Loops

For Loop While Loop Do While Loop Break Continue Nested Loop Infinite Loop Recap - Dynamic Input

12String Operations

String Methods Part 1 String Methods Part 2 String Formatting

Practice on your own: Online C# compiler