Switch statement in swift in swift

 /**
      switch statement
      */
    let str = "aAbBacdef"
    let str2 = "aAbBadef"
    let str3 = "aAbBadeff"
//    var array = [];
    for c in ["A", "a", str3]
    {
      switch c {
//      case "a":
      case "a", "A":
        print("ldd")
        
      // Must have      default:
        print("dd")
      }
    }
    /**
      case "a":
      case "A":
      print("ldd")
      In C language, print("ldd") will be executed no matter if a A is encountered;
      This is not allowed in Swift, but it can be written like this
      case "a", "A": Separate the middle with commas
      */
//    switch value {
//    case pattern:
//      code
//    default:
//      code
//    }
    /**
      In c language
      There is a break below the case;
      If you forget to write break, the following statements will be executed sequentially until break is executed;
      But the swift language just sees this, don't break it.  After comparing the conditions in the case,
      The switch statement will automatically exit after execution.
      If you want to continue executing, use fallthrough
      */