The result is:
\n"; $n = $_GET['n_value']; $s = rec_gauss_sum($n); /* function call */ echo "S($n) = 1 + 2 + 3 + ... + $n = $s"; echo "
\n".'recompute.
'; echo "\n".'Other curious facts on 1+2+3+4+....
'; } else { echo 'This calculator computes the Little Gauss sum, S(n) = 1 + 2 + 3 + ... + (n-1) + n:
'; } ?>