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73 lines
1.3 KiB
73 lines
1.3 KiB
/**
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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 迴圈 */
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int forLoop(int n) {
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int res = 0;
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// 迴圈求和 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 迴圈 */
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int whileLoop(int n) {
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int res = 0;
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int i = 1; // 初始化條件變數
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// 迴圈求和 1, 2, ..., n-1, n
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while (i <= n) {
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res += i;
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i++; // 更新條件變數
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}
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return res;
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}
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/* while 迴圈（兩次更新） */
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int whileLoopII(int n) {
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int res = 0;
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int i = 1; // 初始化條件變數
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// 迴圈求和 1, 4, 10, ...
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while (i <= n) {
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res += i;
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// 更新條件變數
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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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/* 雙層 for 迴圈 */
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String nestedForLoop(int n) {
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String res = "";
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// 迴圈 i = 1, 2, ..., n-1, n
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for (int i = 1; i <= n; i++) {
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// 迴圈 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 迴圈的求和結果 res = $res");
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res = whileLoop(n);
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print("\nwhile 迴圈的求和結果 res = $res");
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res = whileLoopII(n);
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print("\nwhile 迴圈（兩次更新）的求和結果 res = $res");
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String resStr = nestedForLoop(n);
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print("\n雙層 for 迴圈的結果 $resStr");
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}
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