닫힌 범위와 반열린 범위

let r = 1...5
for n in r {
    print(n)
}

for n in 1...5 {
    print(n)
}

for n in 0..<5 {
    print(n)
}

let items = ["a", "b", "c"]
for i in 0..<items.count {
    print("\(i): \(items[i])")
}

let closed = 1...5
let halfOpen = 0..<5
print(closed.count)
print(halfOpen.count)

let valid = 1...100
print(valid.contains(50))
print(valid.contains(0))
print(valid.contains(101))

let r = 10...20
print(r.lowerBound)
print(r.upperBound)

let empty = 5..<5
print(empty.isEmpty)
let single = 5...5
print(single.count)

let score = 73
switch score {
case 0..<60:
    print("Fail")
case 60...100:
    print("Pass")
default:
    print("Invalid")
}

let lo = 2
let hi = 8
if lo <= hi {
    for n in lo...hi {
        print(n)
    }
}

var total = 0
for _ in 1...4 {
    total += 10
}
print(total)

for i in 0..<3 { print(i) }