73 lines
1.3 KiB
Dart
73 lines
1.3 KiB
Dart
/**
|
|
* File: iteration.dart
|
|
* Created Time: 2023-08-27
|
|
* Author: liuyuxin (gvenusleo@gmail.com)
|
|
*/
|
|
|
|
/* for loop */
|
|
int forLoop(int n) {
|
|
int res = 0;
|
|
// Loop sum 1, 2, ..., n-1, n
|
|
for (int i = 1; i <= n; i++) {
|
|
res += i;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
/* while loop */
|
|
int whileLoop(int n) {
|
|
int res = 0;
|
|
int i = 1; // Initialize condition variable
|
|
// Loop sum 1, 2, ..., n-1, n
|
|
while (i <= n) {
|
|
res += i;
|
|
i++; // Update condition variable
|
|
}
|
|
return res;
|
|
}
|
|
|
|
/* while loop (two updates) */
|
|
int whileLoopII(int n) {
|
|
int res = 0;
|
|
int i = 1; // Initialize condition variable
|
|
// Loop sum 1, 4, 10, ...
|
|
while (i <= n) {
|
|
res += i;
|
|
// Update condition variable
|
|
i++;
|
|
i *= 2;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
/* Double for loop */
|
|
String nestedForLoop(int n) {
|
|
String res = "";
|
|
// Loop i = 1, 2, ..., n-1, n
|
|
for (int i = 1; i <= n; i++) {
|
|
// Loop 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("\nSum result of for loop res = $res");
|
|
|
|
res = whileLoop(n);
|
|
print("\nSum result of while loop res = $res");
|
|
|
|
res = whileLoopII(n);
|
|
print("\nSum result of while loop (two updates) res = $res");
|
|
|
|
String resStr = nestedForLoop(n);
|
|
print("\nResult of double for loop $resStr");
|
|
}
|