Set集合进行运算操作

源代码：

//
//Set集合进行运算操作.swift
//
//  Created by chenzhen on 16/8/2.
//  From 大连东软信息学院
//  Copyright © 2016年 zhen7216. All rights reserved.
//

import Foundation

let A: Set<String> = ["a", "b", "c", "d"]
let B: Set<String> = ["d", "c", "e", "f"]

print("A与B的交集:\(A.intersect(B))")
print("A与B的并集:\(A.union(B))")
print("A与B的异或:\(A.exclusiveOr(B))")

let C = A.subtract(B)
print("A与B差集 = \(C)")

if C.isSubsetOf(A) {
    print("C是A的子集")
}

运行结果：