[請益] PV值無法改變
<?
$A = pow(1 + $i ,-2);
$B = pow(1 + $i ,-4);
$C = pow(1 + $i ,-6);
$D = pow(1 + $i ,-9);
$E = pow(1 + $i ,-11);
$PV = 100 + 100*$A + 100*$B + 100*$C -200*$D -250*$E ;
$down = 0;
$up = 1;
while($PV < 0)
{
$up = ($down + $up)/2;
$i = $up;
if($i < 0.00001)
{
break;
}
echo " PV = $PV <BR>" ;
echo " i = $i <BR> ";
echo " A = $A <BR>";
echo " down = $down <BR>";
echo " up = $up <BR>";
}
?>
i值可以持續的在改變，可是卻無法帶回$A、$B、$C、$D、$E、$PV...
有板友可以給予指點嗎?先謝囉~~
我大概知道問題在哪，可是卻不知怎麼改
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