mirror of
https://github.com/krahets/hello-algo.git
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e720aa2d24
* Sync recent changes to the revised Word. * Revised the preface chapter * Revised the introduction chapter * Revised the computation complexity chapter * Revised the chapter data structure * Revised the chapter array and linked list * Revised the chapter stack and queue * Revised the chapter hashing * Revised the chapter tree * Revised the chapter heap * Revised the chapter graph * Revised the chapter searching * Reivised the sorting chapter * Revised the divide and conquer chapter * Revised the chapter backtacking * Revised the DP chapter * Revised the greedy chapter * Revised the appendix chapter * Revised the preface chapter doubly * Revised the figures
75 lines
1.5 KiB
Swift
75 lines
1.5 KiB
Swift
/**
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* File: iteration.swift
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* Created Time: 2023-09-02
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* Author: nuomi1 (nuomi1@qq.com)
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*/
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/* for 循环 */
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func forLoop(n: Int) -> Int {
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var res = 0
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// 循环求和 1, 2, ..., n-1, n
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for i in 1 ... n {
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res += i
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}
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return res
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}
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/* while 循环 */
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func whileLoop(n: Int) -> Int {
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var res = 0
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var i = 1 // 初始化条件变量
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// 循环求和 1, 2, ..., n-1, n
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while i <= n {
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res += i
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i += 1 // 更新条件变量
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}
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return res
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}
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/* while 循环（两次更新） */
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func whileLoopII(n: Int) -> Int {
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var res = 0
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var i = 1 // 初始化条件变量
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// 循环求和 1, 4, 10, ...
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while i <= n {
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res += i
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// 更新条件变量
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i += 1
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i *= 2
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}
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return res
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}
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/* 双层 for 循环 */
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func nestedForLoop(n: Int) -> String {
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var res = ""
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// 循环 i = 1, 2, ..., n-1, n
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for i in 1 ... n {
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// 循环 j = 1, 2, ..., n-1, n
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for j in 1 ... n {
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res.append("(\(i), \(j)), ")
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}
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}
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return res
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}
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@main
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enum Iteration {
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/* Driver Code */
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static func main() {
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let n = 5
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var res = 0
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res = forLoop(n: n)
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print("\nfor 循环的求和结果 res = \(res)")
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res = whileLoop(n: n)
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print("\nwhile 循环的求和结果 res = \(res)")
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res = whileLoopII(n: n)
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print("\nwhile 循环（两次更新）求和结果 res = \(res)")
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let resStr = nestedForLoop(n: n)
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print("\n双层 for 循环的遍历结果 \(resStr)")
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}
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}
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