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C# Basics

bookDeclaring 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

main.cs

copy

              
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

main.cs

copy

              
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.
        }
    }
}
question-icon

Complete the code for declaring a constant called pi having a value of 3.14:

Click or drag`n`drop items and fill in the blanks

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Seksjon 2. Kapittel 10

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bookDeclaring Constants

Sveip for å vise menyen

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

main.cs

copy

              
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

main.cs

copy

              
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.
        }
    }
}
question-icon

Complete the code for declaring a constant called pi having a value of 3.14:

Click or drag`n`drop items and fill in the blanks

Alt var klart?

Hvordan kan vi forbedre det?

Takk for tilbakemeldingene dine!

Seksjon 2. Kapittel 10
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