3.Swift - 控制语句

3.循环语句
for

let individualScores = [75, 43, 103, 87, 12]
for score in individualScores {
    if score > 50 {
        print("\(score)")
    }
}

let interestingNumbers = [
    "Prime": [2, 3, 5, 7, 11, 13],
    "Fibonacci": [1, 1, 2, 3, 5, 8],
    "Square": [1, 4, 9, 16, 25],
]
var largest = 0
for (kind, numbers) in interestingNumbers {
    for number in numbers {
        if number > largest {
            largest = number
        }
    }
}
print(largest)
> Prints "25"

while

var n = 2
while n < 100 {
    n *= 2
}
print(n)

repeat while

var m = 2
repeat {
    m *= 2
} while m < 100
print(m)

for in ...

var total = 0
//注意 ... 包含左右  ..< 包左不包右
for i in 0..<4 {
    total += i
}
print(total)