On Saturday, 23 March 2024 at 19:30:29 UTC, Menjanahary R. R.
wrote:
for (T candidate = T(5); candidate * candidate <= n;
candidate += T(6)) {
When T is `const int`, the above code declares and initializes a
constant variable:
```d
const int candidate = const int(5);
```
Then, at the end of each loop iteration, it does:
```d
candidate += const int(6);
```
So you are trying to modify a constant. Constants can only be
initialized, never assigned.
T candidate = (n % T(2) == T(0)) ? n + T(1) : n + T(2); //
Start from next Odd
for (;; candidate += T(2)) { // Skip even
Same here, you declare a constant then try to assign to it at the
end of each loop iteration.
