带有 if 语句的 C# Switch Case 不返回 console.WriteLines

Question

I am trying to create a simple switch case with If-Statements code.

Problem:

I don't get any value back.

For Example:

If I put int Temperature = 0; the Code should output "Es ist kalt". But my console doesn't display anything.

using System;

namespace SwitchCase
{
    class Program
    {
        static void Main(string[] args)
        {
            int Temperatur = 25;

            switch (Temperatur)
     
            {
                    case 1:
                    if (Temperatur <= 0)
                    {
                        Console.WriteLine("Es ist kalt");
                    }
                    break;
                    case 2:
                    if (Temperatur >= 25)
                    {
                        Console.WriteLine("Es ist überdurchschnittlich warm");
                    }
                    break;
                    case 3:
                    if (Temperatur <= 13)
                    {
                        Console.WriteLine("Es ist mild");
                    }
                    break;
                    
                


            };

        }
    }
}

Answer 1

Your code doesn't make much sense. When Temperatur is exactly 1 or 2 , it cannot be less than or equal 0 nor greater than or equal 25 . So there's no way Temperatur has a value that gets any of the first two branches of the switch selected and additionally satisfies the if in that branch.

Just using if and else if does what you presumably want:

...
if (Temperatur <= 0)
{
    Console.WriteLine("Es ist kalt");
}
else if (Temperatur <= 13)
{
    Console.WriteLine("Es ist mild");
}
else if (Temperatur >= 25)
{
    Console.WriteLine("Es ist überdurchschnittlich warm");
}
...

Answer 2

your if block never reaches a situation where temperature is 0.

you only have cases for temperatures 1, 2 and 3 ( case 1: ), so if temperature is anything else than those, nothing will happen.

Therefore, you should use if / else statements:

if (Temperatur <= 0)
{
    Console.WriteLine("Es ist kalt");
}
else if (Temperatur <= 13)
{
    Console.WriteLine("Es ist mild");
}
else
{
    Console.WriteLine("Es ist überdurchschnittlich warm");
}

Answer 3

You Just need if-statement:

using System;

public class Example
{
   public static void Main()
   {
      if (Temperatur <= 0)
{
    Console.WriteLine("Es ist kalt");
}
else if (Temperatur <= 13)
{
    Console.WriteLine("Es ist mild");
}
else if (Temperatur >= 25)
{
    Console.WriteLine("Es ist überdurchschnittlich warm");
}
   }
}