1
2
3
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5
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7
8
9
//包含10
for i in 1...10 {
print(i)
}
//不包含10
for i in 1..<10 {
print(i)
}
1
2
3
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5
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7
8
let test = "helLo"
let interval = "a"..."z"
for c in test.characters {
if !interval.contains(String(c)) {
print("\(c) 不是小写字母")
}
}
