Declaring Constants

Constants are like variables, but their value is set once at the time of declaration and cannot be changed later.

They are helpful in making the code more understandable by clearly indicating which values are fixed and should not change throughout the program. Additionally, using constants helps prevent accidental changes to data, thereby reducing bugs in the code.

To declare a constant, we use a syntax similar to variable declaration, but we add the keyword const before it:

main.cs


              12345678910111213
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			const int myVar = 10;
			Console.WriteLine(myVar);
        }
    }
}

If we try to modify a constant, the compiler will show an error:

main.cs


              1234567891011121314
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			const int myVar = 10;
			myVar = 20; 
          // Error: The left-hand side of an assignment must be a variable, property or indexer.
        }
    }
}

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Cursusinhoud

C# Basics

1. Getting Started

2. Dealing with Data Types

3. Control Structures

4. Loops

for Loop Challenge: for Loop while Loop do-while Loop Challenge: do-while Loop break Statement continue Statement Challenge: break and continue

5. Arrays

What are Arrays?Challenge: Array Declaration Indexing Challenge: Indexing Multi-Dimensional Arrays Challenge: Multi-Dimensional Arrays Looping through Arrays Challenge: Array Loops

6. Methods

Declaring Constants

Constants are like variables, but their value is set once at the time of declaration and cannot be changed later.

To declare a constant, we use a syntax similar to variable declaration, but we add the keyword const before it:

main.cs


              12345678910111213
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			const int myVar = 10;
			Console.WriteLine(myVar);
        }
    }
}

If we try to modify a constant, the compiler will show an error:

main.cs


              1234567891011121314
            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			const int myVar = 10;
			myVar = 20; 
          // Error: The left-hand side of an assignment must be a variable, property or indexer.
        }
    }
}

Was alles duidelijk?

Bedankt voor je feedback!

Sectie 2. Hoofdstuk 10