Control cannot fall through from one case label ('default:') to another in C#

Question

I am having trouble with the following code it seems that the break statement is good but I could not be seeing something.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace Switch
{
class swtich
{
    static void Main(string[] args)
    {
        string input; int num;
        Console.WriteLine("Enter a number from 0-6: ");
        input = Console.ReadLine();
        num = int.Parse(input);
        switch (num)
        {
            case 0:
                Console.WriteLine("Sunday");
                break;
            case 1:
                Console.WriteLine("Monday");
                break;
            case 2:
                Console.WriteLine("Tuesday");
                break;
            case 3:
                Console.WriteLine("Wednesday");
                break;
            case 4:
                Console.WriteLine("Thursday");
                break;
            case 5:
                Console.WriteLine("Friday");
                break;
            case 6:
                Console.WriteLine("Saturday");
                break;
            default:
                Console.WriteLine("Invalid input");
        }
    }
}
}

this is the error I am getting Control cannot fall through from one case label ('default:') to another

This is not a duplicate of https://stackoverflow.com/questions/6696692/control-cannot-fall-through-from-one-case-label — seebiscuit, Jan 09 '19 at 16:45

score 67 · Answer 1 · answered Feb 05 '15 at 04:47

67

Put a break; after your default: case.

...
  case 6:
    Console.WriteLine("Saturday");
    break;
  default:
    Console.WriteLine("Invalid input");
    break;
}

The default case isn't required to be at the end, so you have to include a break just like everywhere else to avoid this warning.

answered Feb 05 '15 at 04:47

Brandon Gano

6,430
1
25
25

oh thanks I forgot about that one – user2005549 Feb 05 '15 at 04:50

Icemanind · Answer 2 · 2016-06-17T14:50:31.400

26

Unlike the switch statements in C, C++ or Java, C# does not allow case statements to fall through, This includes the default case statement. You must add break after your default case.

default:
    Console.WriteLine("Invalid Input");
    break; // this is required

As @AlexeiLevenkov pointed out, break isn't necessarily required, however, some kind of statement that prevents reaching the end of the construct is required, such as return, break or goto case.

edited Jun 17 '16 at 14:50

answered Feb 05 '15 at 04:51

Icemanind

47,519
50
171
296

6

Note that "break" is not required to be part of the block - any construct that prevents reaching end of the block (like `return`) would do as covered in specification - [The switch statement (C#)](https://msdn.microsoft.com/en-us/library/aa664749(v=vs.71).aspx), so `return` can be used instead of `break` in this particular case. – Alexei Levenkov Feb 05 '15 at 05:43

Control cannot fall through from one case label ('default:') to another in C#

2 Answers2