int total=0, number=0;
float percentage=0.0;
percentage=(number/total)*100;
printf("%.2f",percentage);
如果数字的值是50且总数是100，那么我应该得到50.00的百分比，至少这是我想要的。但我一直得到0.00作为答案，并尝试了很多类型的改变，但没有用。
答案 0 :(得分：25)
整数除法截断，因此(50/100)会导致0.您可以转换为float（更好double）或乘以100.0（double精度，100.0f精度为float，首先，
double percentage;
// ...
percentage = 100.0*number/total;
// percentage = (double)number/total * 100;
或
float percentage;
// ...
percentage = (float)number/total * 100;
// percentage = 100.0f*number/total;
由于浮点运算不是关联的，100.0*number/total和(double)number/total * 100的结果可能略有不同（同样适用于float），但它极不可能影响前两个小数点后面的位置，所以你选择哪种方式可能无关紧要。
答案 1 :(得分：6)
C中的整数除法会截断结果，因此50/100将为您提供0
如果您想获得所需的结果，请尝试以下方法：
((float)number/total)*100
或
50.0/100
答案 2 :(得分：2)
不，因为你使用整数表达式，所以你将整数 50除以整数 100，这会产生整数 0.键入其中一个到float，它应该可以工作。
答案 3 :(得分：1)
您正在进行整数运算，因此结果是正确的。尝试
percentage=((double)number/total)*100;
BTW %f期望double不是float。通过在这里转换的纯粹运气，它运作良好。但是现在你通常在C中主要使用double作为浮点类型。
答案 4 :(得分：1)
如果我想要浮点数，我会经常乘以1.0，这比记住规则更容易。
答案 5 :(得分：0)
这可以为您提供所需的结果。
double total = 0;
int number = 0;
float percentage = number / total * 100
printf("%.2f",percentage);
请注意，第一个操作数是双
答案 6 :(得分：0)
将您的代码更改为：
int total=0, number=0;
float percentage=0.0f;
percentage=((float)number/total)*100f;
printf("%.2f", (double)percentage);
答案 7 :(得分：0)
这可以为您提供正确的答案
#include <stdio.h>
int main()
{
float total=100, number=50;
float percentage;
percentage=(number/total)*100;
printf("%0.2f",percentage);
return 0;
}
答案 8 :(得分：0)
这应该可以使其圆整到2点
if ($query->rowCount() > 0) {
foreach ($results as $result) {
?>
<tr>
<td width="10"><?php echo htmlentities($result->sr_no);?></td>
<td width="10"><?php echo htmlentities($result->code);?></td>
<td width="10"><?php echo htmlentities($result->unit_name);?></td>
<?php
$status = $result->status;
if ($status == 'TRUE') {
?>
<td class="v-align-middle">
<div class="checkbox check-primary">
<input type="checkbox" value="" id="status_true" checked> <label
for="status_true"></label>
</div>
</td>
<?php
} else {
?>
<td class="v-align-middle">
<div class="checkbox check-primary">
<input type="checkbox" value="" id="status_false"> <label
for="status_false"></label>
</div>
</td>
<?php
}
?>
<td>
<?php $result->code;?>
<button type="button" name="modify"
class="btn btn-primary btn-sm btn-small" data-toggle="modal"
data-target="#myModal"
data-id="<?php $code_send=$result->code;?>">Modify</button>
<?php
$sql = "SELECT * FROM `unit_master` where code='$code_send'";
$query = $dbh->prepare($sql);
$query->execute();
$results = $query->fetchAll(PDO::FETCH_OBJ);
$cnt = 1;
if ($query->rowCount() > 0) {
foreach ($results as $result) {
$code = $result->code;
$unit_name = $result->unit_name;
$abbbr = $result->abbreviation;
$app_from = $result->applicable_from;
$opd_no = $result->OPD_No;
$con_no = $result->concession_no;
$free_no = $result->freeship_no;
$credt_note_no = $result->credit_note_no;
$debit_note_no = $result->debit_note_no;
$ipd_no = $result->IPD_no;
$ipd_no_prefix = $result->IPD_no_prefix;
$receipt_no = $result->receipt_no;
$corp_receipt_no = $result->corp_receipt_no;
$adv_receipt_no = $result->adv_receipt_no;
$refund_receipt_no = $result->refund_receipt_no;
}
}
?>
<!-- Modal -->
<form name="update" id="update" method="post"
action="userindex.php" enctype="multipart/form-data">
<input type="hidden" name="q" value="unit_master" /> <input
type="hidden" name="flg" value="2">
<div class="modal fade" id="myModal" tabindex="-1"
role="dialog" aria-labelledby="myModalLabel"
aria-hidden="true">
<div class="modal-dialog">
<div class="modal-content">
<div class="modal-header">
<button type="button" class="close" data-dismiss="modal"
aria-hidden="true">X</button>
<h4 id="myModalLabel" class="semi-bold">Modify Unit</h4>
<br>
</div>
<div class="modal-body">
<div class="row form-row">
<div class="col-md-4">
<input type="text" class="form-control"
value="<?php echo $code?>" placeholder="Code"
name="code" id="code">
</div>
<div class="col-md-8">
<input type="text" class="form-control"
value="<?php echo $unit_name?>" placeholder="Name"
name="unit_name" id="unit_name">
</div>
</div>
<div class="row form-row">
<div class="col-md-4">
<input type="text" class="form-control"
value="<?php echo $abbbr?>"
placeholder="Abbriviation" name="Abbriviation"
id="Abbriviation">
</div>
<div class="col-md-3">
<label> Aplicable From</label>
</div>
<div class="col-md-5">
<div
class="input-append success date col-md-10 col-lg-6 no-padding">
<input type="text" class="form-control"
value="<?php echo $app_from?>"> <span class="add-on"><span
class="arrow" name="applicable_from"
id="applicable_from"></span><i class="fa fa-th"></i></span>
</div>
</div>
</div>
</div>
<center>
<h4 id="myModalLabel" class="semi-bold">OPD</h4>
</center>
<div class="modal-body">
<div class="row form-row">
<div class="col-md-4">
<input type="text" class="form-control"
value="<?php echo $opd_no?>" placeholder="OPD No"
name="opd_no" id="opd_no">
</div>
<div class="col-md-4">
<input type="text" class="form-control"
value="<?php echo $con_no?>"
placeholder="Concession No" name="concession_no"
id="concession_no">
</div>
<div class="col-md-4">
<input type="text" class="form-control"
value="<?php echo $free_no?>"
placeholder="Freeship No" name="freeship_no"
id="freeship_no">
</div>
</div>
<div class="row form-row">
<div class="col-md-4">
<input type="text" class="form-control"
value="<?php echo $credt_note_no?>"
placeholder="Credit Note No" name="credit_note_no"
id="credit_note_no">
</div>
<div class="col-md-4">
<input type="text" class="form-control"
value="<?php echo $debit_note_no?>"
placeholder="Debit Note No" name="debit_note_no"
id="debit_note_no">
</div>
<div class="col-md-2">
<div class="checkbox check-primary">
<input type="checkbox" value="1"
id="checkboxIsDialysis"> <label
for="checkboxIsDialysis"> IsDialysis</label>
</div>
</div>
</div>
</div>
<center>
<h4 id="myModalLabel" class="semi-bold">IPD</h4>
</center>
<div class="modal-body">
<div class="row form-row">
<div class="col-md-4">
<input type="text" class="form-control"
value="<?php echo $ipd_no?>" placeholder="IPD No"
name="ipd_no" id="ipd_no">
</div>
<div class="col-md-4">
<input type="text" class="form-control"
value="<?php echo $ipd_no_prefix?>"
placeholder="IPD No Prefix" name="ipd_no_prefix"
id="ipd_no_prefix">
</div>
<div class="col-md-4">
<input type="text" class="form-control"
value="<?php echo $receipt_no?>"
placeholder="Receipt No" name="receipt_no"
id="receipt_no">
</div>
</div>
<div class="row form-row">
<div class="col-md-4">
<input type="text" class="form-control"
value="<?php echo $corp_receipt_no?>"
placeholder="Corp Receipt No" name="corp_receipt_no"
id="corp_receipt_no">
</div>
<div class="col-md-4">
<input type="text" class="form-control"
value="<?php echo $adv_receipt_no?>"
placeholder="Adv Receipt No" name="adv_receipt_no"
id="adv_receipt_no">
</div>
<div class="col-md-4">
<input type="text" class="form-control"
value="<?php echo $refund_receipt_no?>"
placeholder="Refund Receipt No"
name="refund_receipt_no" id="refund_receipt_no">
</div>
</div>
</div>
<div class="modal-footer">
<button type="button" class="btn btn-default"
data-dismiss="modal">Close</button>
<button type="submit" class="btn btn-primary">Save
changes</button>
</div>
</div>
<!-- /.modal-content -->
</div>
<!-- /.modal-dialog -->
</div>
<!-- /.modal -->
<!-- <button type="button" class="btn btn-danger btn-sm btn-small">Delete</button> -->
</td>
<!-- <td width="70"><a href="functions_upload.php?eid=val=5">Delete</a></td>-->
</tr>
</form>