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
72 lines
1.3 KiB
Dart
72 lines
1.3 KiB
Dart
/**
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* File: iteration.dart
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* Created Time: 2023-08-27
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* Author: liuyuxin (gvenusleo@gmail.com)
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*/
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/* for 循环 */
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int forLoop(int n) {
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int res = 0;
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// 循环求和 1, 2, ..., n-1, n
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for (int i = 1; i <= n; i++) {
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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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int whileLoop(int n) {
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int res = 0;
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int 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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int whileLoopII(int n) {
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int res = 0;
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int 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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String nestedForLoop(int n) {
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String res = "";
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// 循环 i = 1, 2, ..., n-1, n
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for (int i = 1; i <= n; i++) {
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// 循环 j = 1, 2, ..., n-1, n
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for (int j = 1; j <= n; j++) {
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res += "($i, $j), ";
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}
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}
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return res;
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}
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/* Driver Code */
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void main() {
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int n = 5;
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int res;
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res = forLoop(n);
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print("\nfor 循环的求和结果 res = $res");
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res = whileLoop(n);
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print("\nwhile 循环的求和结果 res = $res");
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res = whileLoopII(n);
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print("\nwhile 循环（两次更新）的求和结果 res = $res");
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String resStr = nestedForLoop(n);
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print("\n双层 for 循环的结果 $resStr");
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}
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