/*
next_multiple_of_10:
--------------------
Returns the next multiple of 10 greater than or equal to n.
Algorithm:
- Add 9 to n: this ensures that any number not already a multiple of 10
will "spill over" into the next multiple when integer-divided by 10.
- Divide by 10: integer division truncates toward zero.
- Multiply by 10: reconstruct the multiple of 10.
Example:
n = 23 → (23 + 9) = 32 → 32 / 10 = 3 → 3 * 10 = 30
n = 40 → (40 + 9) = 49 → 49 / 10 = 4 → 4 * 10 = 40
*/
function next_multiple_of_10(int $n): int {
return intdiv($n + 9, 10) * 10;
}
/*
main:
-----
Demonstrates the function with a sample input.
*/
$nums = [23, 10, 0, 1841];
$length = count($nums);
for ($i = 0; $i < $length; $i++) {
echo next_multiple_of_10($nums[$i]) . "\n";
}
/*
run:
30
10
0
1850
*/
