算术运算符：
let a = 5
let b = 2
let sum = a + b
let difference = a - b
let product = a * b
let quotient = a / b
let remainder = a % b
比较运算符：
let isEqual = a == b
let isNotEqual = a != b
let isGreater = a > b
let isLess = a < b
let isGreaterOrEqual = a >= b
let isLessOrEqual = a <= b
逻辑运算符：
let andResult = (a > 0) && (b > 0)
let orResult = (a > 0) || (b > 0)
let notResult = !(a > 0)
范围运算符：
let rangeClosed = 1...5 // 包含 1 和 5
let rangeHalfOpen = 1..<5 // 包含 1 不包含 5
三元条件运算符：
let result = (a > b) ? "a is greater" : "b is greater"
空合并运算符：
let username: String? = "John"
let defaultUsername = "Guest"
let finalUsername = username ?? defaultUsername
区间运算符：
for i in 1..<5 {
print(i) // 打印 1, 2, 3, 4
}
位运算符：
let bitwiseAnd = a & b
let bitwiseOr = a | b
let bitwiseXor = a ^ b
let bitwiseNot = ~a
let leftShift = a << 1
let rightShift = a >> 1
这只是一些 Swift 中常见的运算符。Swift 还支持其他运算符和操作，包括赋值运算符、范围运算符、空合并运算符等。深入学习 Swift 运算符，可以更好地理解和使用这门语言的功能。
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