• Victor@lemmy.world
      4·
      4 days ago

      Is “case expr:” really a label? You could put anything in there, like “case 42:”. I don’t see a label, but maybe I don’t know what a label is in C.

      • TwilightKiddy@scribe.disroot.orgEnglish
        1·
        4 days ago

        In C# it’s certainly a label, it’s the same syntax and you can also jump to them with goto, which is actually very convenient sometimes. As far as I know this is an ancient feature and seeing how early C# was mostly inspired by C, I would expect it to behave the same way there.

        • Victor@lemmy.world
          1·
          3 days ago

          What?

          If I have a case 42: in C#, I can issue a goto 42 and resume execution after that case? Or how would that work?

          From what I know, labels are only an identifier followed by a colon, like:

          stop: printf("stopped.\n");

          Or just the label and colon on one line and statements following on subsequent lines. I’ve never seen a switch case expression being called a “label”. Very new to me. Would love to see a minimal demonstration example. 🙏

          Edit: huh, I guess you can.

          • TwilightKiddy@scribe.disroot.orgEnglish
            3·
            3 days ago

            Yes, you would do goto case 42;
            From MSDN:

            private static decimal CalculatePrice(CoffeeChoice choice)
{
    decimal price = 0;
    switch (choice)
    {
        case CoffeeChoice.Plain:
            price += 10.0m;
            break;

        case CoffeeChoice.WithMilk:
            price += 5.0m;
            goto case CoffeeChoice.Plain;

        case CoffeeChoice.WithIceCream:
            price += 7.0m;
            goto case CoffeeChoice.Plain;
    }
    return price;
}