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hello-algo/zh-hant/codes/dart/chapter_computational_compl.../iteration.dart

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/**
* File: iteration.dart
* Created Time: 2023-08-27
* Author: liuyuxin (gvenusleo@gmail.com)
*/
/* for 迴圈 */
int forLoop(int n) {
int res = 0;
// 迴圈求和 1, 2, ..., n-1, n
for (int i = 1; i <= n; i++) {
res += i;
}
return res;
}
/* while 迴圈 */
int whileLoop(int n) {
int res = 0;
int i = 1; // 初始化條件變數
// 迴圈求和 1, 2, ..., n-1, n
while (i <= n) {
res += i;
i++; // 更新條件變數
}
return res;
}
/* while 迴圈(兩次更新) */
int whileLoopII(int n) {
int res = 0;
int i = 1; // 初始化條件變數
// 迴圈求和 1, 4, 10, ...
while (i <= n) {
res += i;
// 更新條件變數
i++;
i *= 2;
}
return res;
}
/* 雙層 for 迴圈 */
String nestedForLoop(int n) {
String res = "";
// 迴圈 i = 1, 2, ..., n-1, n
for (int i = 1; i <= n; i++) {
// 迴圈 j = 1, 2, ..., n-1, n
for (int j = 1; j <= n; j++) {
res += "($i, $j), ";
}
}
return res;
}
/* Driver Code */
void main() {
int n = 5;
int res;
res = forLoop(n);
print("\nfor 迴圈的求和結果 res = $res");
res = whileLoop(n);
print("\nwhile 迴圈的求和結果 res = $res");
res = whileLoopII(n);
print("\nwhile 迴圈(兩次更新)的求和結果 res = $res");
String resStr = nestedForLoop(n);
print("\n雙層 for 迴圈的結果 $resStr");
}