我正在嘗試根據每個積分的金額進行一些計算，以獲得所請求金額中使用的總積分。請參考以下代碼：<?php$amount_perpoints = bcdiv(622.9106666666667,1,2); // AMOUNT OF MONEY PER POINTS$request_amount = 3114.55; //REQUESTED AMOUNT OF POINTS$points = 0; // THIS WILL CONTAIN THE TOTAL POINTS$total_amount = 0; // THIS WILL INCREMENT ACCORDING TO THE PRODUCT OF THE CURRENT POINT AND AMOUNT PER POINTSwhile($total_amount < $request_amount){ $points = $points+0.50; //POINTS INCREMENTING BY 0.5 $total_amount = $points * $amount_perpoints;}echo $points;?>輸出：5.50上面的場景輸出，但我相信它應該只是.在迭代的點，并且 已經具有相同的值。為什么 while 循環仍然滿足比較變量的兩個值不小于但等于？5.505.005.00$total_amount$request_amount3114.55
4 回答
慕神8447489
TA貢獻1780條經驗 獲得超1個贊
使用小數分數作為浮點數進行計算時會發生錯誤。浮點數不能精確表示某些十進制數。僅使用 BC 數學函數進行此類計算。您也不需要循環。
$amount_perpoints = "622.91"; // AMOUNT OF MONEY PER POINTS
$request_amount = "3114.55"; //REQUESTED AMOUNT OF POINTS for result 5.0
//$request_amount = "3426.005"; //REQUESTED AMOUNT OF POINTS for result 5.5
$point_step = "0.50";
//calculation
$points = bcdiv($request_amount,$point_step,2);
$points = bcdiv($points,$amount_perpoints,0);
$points = bcmul($points,$point_step,1);
//output
var_dump($points); //string(3) "5.0"
德瑪西亞99
TA貢獻1770條經驗 獲得超3個贊
<?php
$amount_perpoints = bcdiv(622.9106666666667,1,2); // AMOUNT OF MONEY PER POINTS
$request_amount = 3114.55; //REQUESTED AMOUNT OF POINTS
$points = 0; // THIS WILL CONTAIN THE TOTAL POINTS
$new_points=0;
$total_amount = 0; // THIS WILL INCREMENT ACCORDING TO THE PRODUCT OF THE CURRENT POINT AND AMOUNT PER POINTS
while($total_amount < $request_amount){
$points=$new_points;
$new_points = $new_points+0.50; //POINTS INCREMENTING BY 0.5
$total_amount = $new_points * $amount_perpoints;
}
echo $points;
?>
侃侃無極
TA貢獻2051條經驗 獲得超10個贊
我認為@jeff是對的：
$amount_perpoints = bcdiv(622.9106666666667,1,2); // AMOUNT OF MONEY PER POINTS
$request_amount = 3114.55; //REQUESTED AMOUNT OF POINTS
$points = 0; // THIS WILL CONTAIN THE TOTAL POINTS
$total_amount = 0; // THIS WILL INCREMENT ACCORDING TO THE PRODUCT OF THE CURRENT POINT AND AMOUNT PER POINTS
while($total_amount <= $request_amount){
$points = $points+0.50; //POINTS INCREMENTING BY 0.5
$total_amount = $points * $amount_perpoints;
}
echo $points;
由于你數到它達到期望的點，它的靈魂是少或等于。它給出的輸出為 ： 5.5
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