Using a semicolon in the fall through of a switch case statement

When working with a fall-through in a case statement, is there any significance to including a semicolon? It seems that the fall-through functions as expected, and the semicolon may just be interpreted as an empty statement. But are there any advantages or disadvantages to including the semicolon? Is there a recommended best practice for this scenario? In the JavaScript example provided below, notice the semicolon in the first case statement.

    switch(a) {
        case 2:;
        case 3: alert('hello'); break;
        default: alert('default hello');
    }

I am curious about the best practices surrounding this issue in C, C++, and Java as well. I have come across information indicating that in C#, a compilation error occurs if a case statement involved in a fall-through contains a statement. Would an empty statement like the one shown above trigger an error in C#?

javascriptjavac#c++c

Answer №1

Actually, it doesn't have any impact.

I would advise against using it as it tends to obscure the code, in my view.

In C++, however, it throws an error. D also does not permit ; as a null statement; you must employ {} instead.

Answer №2

; doesn't serve any purpose in C, C++, and Java. If it's not necessary, it's best to avoid using it. However, if you're implementing Duff's Device or a similar technique, consider adding "fall through" or "no break" comments for the benefit of future code readers.

In the context of C#

switch(a) {
    case 2:;
    case 3: Console.WriteLine("hello"); break;
    default: Console.WriteLine("default hello");
}

Using a semicolon after case 2 prevents cases 2 and 3 from executing the same code in C#, where fall-through is limited.

switch(a) {
    case 2:
    case 3: Console.WriteLine("hello"); break;
    default: Console.WriteLine("default hello"); break;
}

Without the semicolon, cases 2 and 3 would execute the same code.

Answer №3

optimal method

A common recommendation is to avoid using empty statements.

If I include an empty statement in my code, will C# raise an error?

Indeed it will.

Answer №4

Although the syntax remains consistent

However, it may cause confusion for some individuals, so I would advise against its use

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