JuniorTheoryCommon

What happens when this program is compiled and run?

SWIFT

let score = 5
switch score {
case 0...5:
    print("low")
case 5...10:
    print("high")
}

It does not compile

Expecting low because the current value 5 has a branch. The compiler checks every possible Int, so a switch on a number needs default.
Expecting a crash only when no branch fits. A missing branch is found by the compiler before the program runs, not while it runs.

JuniorTheoryCommon

SWIFT

let score = 5
switch score {
case 0...5:
    print("low")
case 5...10:
    print("high")
}

It does not compile

Expecting low because the current value 5 has a branch. The compiler checks every possible Int, so a switch on a number needs default.
Expecting a crash only when no branch fits. A missing branch is found by the compiler before the program runs, not while it runs.