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C# Grundlæggende

bookSwitch-sætning

The switch statement functions similarly to the conditional statements however it is useful in specific situations.

The syntax for the switch statement is the following:

main.cs

main.cs

copy

              
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switch(expression)
{
    case x:
        // code block
        break;
    case y:
        // code block
        break;
    case z:
        // code block
        break;
    …
    default:
        // code block
        break;
}

The resultant of the expression is compared against the cases x, y, z, and so forth. If it matches a case, it executes the code block of that case. If no case is matched then the default code block is executed if it is provided. The expression is most commonly a variable. We write the break keyword after each case's code block to indicate the end of that case.

Following is an example:

main.cs

main.cs

copy

              
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using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			int score = 5;

			Console.Write("Grade: ");
			switch(score)
			{
			    case 1:
			        Console.WriteLine("Fail");
			        break;
			    case 2:
			        Console.WriteLine("Pass");
			        break;
			    case 3:
 			       Console.WriteLine("Satisfactory");
			        break;
			    case 4:
			        Console.WriteLine("Good");
			        break;
			    case 5:
			        Console.WriteLine("Excellent");
			        break;
			    default:
			        Console.WriteLine("Invalid");
			        break;
			}
        }
    }
}

You can try changing the value of the variable grade to see the change in the output. The value of grade is compared against each case and the relevant output is displayed.

The same code can be written using if-else statements as well; however in this case the switch statement is more efficient and neater. Whenever we have to compare the result of an expression against many possible values, we use the switch statement.

1. What is the primary purpose of using a switch statement in programming?

2. In the provided C# example, what will be the output if the variable score is set to 3?

question mark

What is the primary purpose of using a switch statement in programming?

Select the correct answer

question mark

In the provided C# example, what will be the output if the variable score is set to 3?

Select the correct answer

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Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 3. Kapitel 11

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Suggested prompts:

Can you show me the syntax for the switch statement?

Can you provide an example of a switch statement in code?

What are some common use cases for using a switch statement?

bookSwitch-sætning

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The switch statement functions similarly to the conditional statements however it is useful in specific situations.

The syntax for the switch statement is the following:

main.cs

main.cs

copy

              
12345678910111213141516

            
switch(expression)
{
    case x:
        // code block
        break;
    case y:
        // code block
        break;
    case z:
        // code block
        break;
    …
    default:
        // code block
        break;
}

The resultant of the expression is compared against the cases x, y, z, and so forth. If it matches a case, it executes the code block of that case. If no case is matched then the default code block is executed if it is provided. The expression is most commonly a variable. We write the break keyword after each case's code block to indicate the end of that case.

Following is an example:

main.cs

main.cs

copy

              
1234567891011121314151617181920212223242526272829303132333435

            
using System;

namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
			int score = 5;

			Console.Write("Grade: ");
			switch(score)
			{
			    case 1:
			        Console.WriteLine("Fail");
			        break;
			    case 2:
			        Console.WriteLine("Pass");
			        break;
			    case 3:
 			       Console.WriteLine("Satisfactory");
			        break;
			    case 4:
			        Console.WriteLine("Good");
			        break;
			    case 5:
			        Console.WriteLine("Excellent");
			        break;
			    default:
			        Console.WriteLine("Invalid");
			        break;
			}
        }
    }
}

You can try changing the value of the variable grade to see the change in the output. The value of grade is compared against each case and the relevant output is displayed.

The same code can be written using if-else statements as well; however in this case the switch statement is more efficient and neater. Whenever we have to compare the result of an expression against many possible values, we use the switch statement.

1. What is the primary purpose of using a switch statement in programming?

2. In the provided C# example, what will be the output if the variable score is set to 3?

question mark

What is the primary purpose of using a switch statement in programming?

Select the correct answer

question mark

In the provided C# example, what will be the output if the variable score is set to 3?

Select the correct answer

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 3. Kapitel 11
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