mirror of
https://github.com/krahets/hello-algo.git
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74 lines
1.5 KiB
Kotlin
74 lines
1.5 KiB
Kotlin
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/**
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* File: iteration.kt
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* Created Time: 2024-01-25
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* Author: curtishd (1023632660@qq.com)
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*/
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package chapter_computational_complexity.iteration
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/* for 循环 */
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fun 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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fun 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++ // 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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fun 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++
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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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fun nestedForLoop(n: Int): String {
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val res = StringBuilder()
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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.toString()
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}
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/* Driver Code */
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fun main() {
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val n = 5
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var res: Int
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res = forLoop(n)
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println("\nfor 循环的求和结果 res = $res")
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res = whileLoop(n)
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println("\nwhile 循环的求和结果 res = $res")
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res = whileLoopII(n)
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println("\nwhile 循环 (两次更新) 求和结果 res = $res")
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val resStr = nestedForLoop(n)
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println("\n双层 for 循环的遍历结果 $resStr")
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}
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