有没有办法在目标C中表示无穷大（如浮点数/双数，或NSN数等）？换句话说，是否有一个float / double / NSNumber值总是大于目标C中的任何其他值？
答案 0 :(得分：8)
这是$rnum = 1;
$receipt = R::findOne('receipts', '1 ORDER BY rnum DESC');
if (isset($rcprec->id)) {
$rnum = $receipt->rnum + 1;
}
$rcptmain = R::dispense( 'receipts' );
$rcptmain->rdate = $dor;
$rcptmain->srdate = $sdor;
$rcptmain->studid = $sid;
$rcptmain->course = $course;
$rcptmain->part = $part;
$rcptmain->otherfees = $otherfees;
$rcptmain->rnum = $rnum;
$id = R::store( $rcptmain );
，
INFINITY您可以在usr / include / math.h
中找到float x = INFINITY;
编辑这里有一些更有趣的内容
http://www.gnu.org/software/libc/manual/html_node/Infinity-and-NaN.html