AAAAAAAAA

<?php

$sup = readline("Sum upper bound : ");

aaa:
print "\n";
    $s = readline("Real part > 0  : ");
    $t = readline("Imaginary part : ");
    bbb:
    $re = 0;
    $im = 0;
    for ($i = 1; $i <= $sup; $i++) {
        $re -= cos(pi()*$i)*cos($t*log($i))/pow($i,$s);
        $im += cos(pi()*$i)*sin($t*log($i))/pow($i,$s);
    }
    if ($t == 0) { $im = 0; }
    if ($im < 0) { $sgnim = "-"; } else { $sgnim = "+"; }
    print "DirichletEta($s + {$t}i) ≈ $re ";
    if ($im != 0) { print "$sgnim ".abs($im)."i\n\n"; }
    else { print "\n\n"; }
    goto aaa;
stop:

?>