金字塔

源代码：

////金字塔.swift////  Created by chenzhen on 16/8/1.//  From 大连东软信息学院//  Copyright © 2016年 zhen7216. All rights reserved.//import Foundationvar i = 1while i < 5 {    for var k = 1; k <= 4 - i; k += 1 {        print(" ", terminator: "")    }    for j in 1...2 * i - 1 {        print("*", terminator: "")    }    print("\n")    i += 1}

运行结果：