UNSW ProgComp: Problem 2 - 2008

<?php

$input = <<<END
4
2  2.0
36.2 50.00000
14.5  30
-4   2
END;

//Why so many spaces, bro?

$input = explode("\n", $input);
array_shift($input);

foreach($input as $key => $value){
    $value = preg_replace("#[ ]+#", ' ', $value); //bloody spaces
    $input[$key] = explode(" ", $value);
}

foreach($input as $key => $value){
    /*
    $value[0] = radius
    $value[1] = chord length
    */
    $break = 0;
    $out_r = str_pad(number_format($value[0], 4, '.', ''), 8, ' ', STR_PAD_LEFT);
    $out_c = str_pad(number_format($value[1], 4, '.', ''), 8, ' ', STR_PAD_LEFT);
    if($value[0] < 0){
        //report "Radius is non-positive"
        echo $out_r.' '.$out_c." Radius is non-positive\n";
        $break = 1;
    }
    if(!($value[1] < 2*$value[0]) && $break == 0){
        //report "Chord is too long"
        echo $out_r.' '.$out_c." Chord is too long\n";
        $break = 1;
    }
    if($break == 0){
        $a = sqrt(pow($value[0], 2) - pow(($value[1]/2), 2));
        $s = $value[0] - $a;
        $angle = 2*rad2deg(asin($value[1]/(2*$value[0])));


        $out_s = str_pad(number_format($s, 4, '.', ''), 9, ' ', STR_PAD_LEFT);
        $out_a = str_pad(number_format($angle, 4, '.', ''), 9, ' ', STR_PAD_LEFT);

        echo $out_r.' '.$out_c.' s ='.$out_s.' angle ='.$out_a."\n";
    }
}