# Sum of the Digits in Numbers

From Software Engineers Wiki

What is the sum of the digits of all the numbers from 1 to 2016?

## Answer

Written in PHP.

function sum_of_digits($num) { for ($sum = 0; $num > 0; $num /= 10) $sum += $num % 10; return $sum; } $first = 1; $last = 2016; for ($i = $first, $result = 0; $i <= $last; ++$i) $result += sum_of_digits($i); print "Result is $result";