我编写了计算学校成绩（包括权重和目标成绩）的PHP代码，但是，它产生了错误的输出值。
这是我目前为止的PHP代码。
<?php
$numassignments = isset($_GET['numassignments']) ? $_GET['numassignments'] : 0;
?>
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Lab 01 - Final Grade Calculator</title>
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-T3c6CoIi6uLrA9TneNEoa7RxnatzjcDSCmG1MXxSR1GAsXEV/Dwwykc2MPK8M2HN" crossorigin="anonymous">
</head>
<body>
<div class="container">
<h1 class="mt-5">Final Grade Calculator</h1>
<p>Welcome to the Final Grade Calculator!</p>
<div class="alert alert-info mb-5">
<h2 class="form-text fs-4 mb-4">To get started, please enter the number of assignments that you've completed so far.</h2>
<form action="<?php echo $_SERVER['PHP_SELF']; ?>" method="get">
<fieldset>
<div class="mb-3">
<label for="numassignments" class="form-label">Number of Assignments:</label>
<input type="number" class="form-control" name="numassignments" id="numassignments" min="1" max="10" value="<?php echo $numassignments ?>" required>
</div>
<p class="form-text">How many assignments have you already completed in this course?</p>
</fieldset>
<div class="mb-3">
<input type="submit" name="submit" value="Generate Rows" class="btn btn-primary">
</div>
</form>
</div>
输入输入值并点击“Generate Row”以在第二个表单字段中生成输入行。对我来说，我把3。
<!-- Second form -->
<?php if (isset($_GET['numassignments']) && $_GET['numassignments'] > 0) : ?>
<div class="alert alert-info mb-5">
<h2 class="form-text fs-4 mb-4">Next, for each assignment, add the grade that you received and the assignment's overall weight.</h2>
<!-- PHP_SELF is the name of the current file WITHOUT any query string info. To retain the query string info, we can use REQUEST_URI -->
<form action="<?php echo $_SERVER['REQUEST_URI']; ?>" method="post">
<fieldset>
<?php
$desired = isset($_POST["desired"]) ? $_POST["desired"] : 0;
for ($i = 1; $i <= $numassignments; $i++) {
echo "<div class=\"row\">";
echo "\n<div class=\"col-md-6\">"; //grade input
echo "\n<div class=\"mb-3\">";
echo "\n<label for=\"keep-numassignments{$i}\" class=\"form-label\">Assignment " . $i . " Grade:</label>";
echo "\n<input type=\"number\" class=\"form-control\" name=\"keep-numassignments[$i]\" id=\"keep-numassignments{$i}\" min=\"0\" max=\"100\" value=\"$keep_numassignments\" required>";
echo "\n</div>";
echo "\n</div>";
echo "\n<div class=\"col-md-6\">"; //weight input
echo "\n<div class=\"mb-3\">";
echo "\n<label for=\"weightnum{$i}\" class=\"form-label\">Assignment " . $i . " Weight:</label>";
echo "\n<input type=\"number\" class=\"form-control\" name=\"weightnum[$i]\" id=\"weightnum{$i}\" min=\"1\" max=\"100\" value=\"$weightnum\" required>";
echo "\n</div>";
echo "\n</div>";
echo "\n</div>";
}
?>
<p class="form-text">Finally, if you would like to calculate what you will need to get on the remainder of your coursework in order to receive a certain grade, enter your desired grade below.</p>
<div class="mb-3">
<label for="desired" class="form-label">Desired Final Grade (Optional):</label>
<input type="number" class="form-control" name="desired" id="desired" min="0" max="100" value="<?php echo $desired; ?>">
</div>
</fieldset>
<div class="mb-3">
<input type="submit" name="gradesubmit" value="Calculate Grade" class="btn btn-primary">
</div>
</form>
</div>
<?php endif; ?>
<?php
if (isset($_POST['gradesubmit'])) {
// Retrieve the values from the form
$grades = isset($_POST["keep-numassignments"]) ? $_POST["keep-numassignments"] : [];
$weights = isset($_POST["weightnum"]) ? $_POST["weightnum"] : [];
$desired = isset($_POST["desired"]) ? $_POST["desired"] : 0;
// Calculate the weighted average of completed assignments
$weightedSum = 0;
$totalWeight = 0;
for ($i = 0; $i < count($grades); $i++) {
$weightedSum += ($weights[$i] * $grades[$i]);
$totalWeight += $weights[$i];
}
$currentAverage = ($totalWeight > 0) ? ($weightedSum / $totalWeight) : 0;
// Calculate the required grade on remaining assessments
if ($totalWeight < 100 && $desired > 0) {
$remainingWeight = 100 - $totalWeight;
$requiredGrade = ($desired - (1 - ($remainingWeight / 100)) * $currentAverage) / $remainingWeight;
} else {
$requiredGrade = 0;
}
// Display the results
echo "<div class=\"alert alert-success mb-5\">";
echo "\n<p>Current Class Average: " . number_format($currentAverage, 2) . "%</p>";
if ($desired > 0) {
echo "\n<p>Required Grade on Remaining Assessments: " . number_format($requiredGrade, 2) . "%</p>";
}
echo "\n</div>";
}
?>
</div>
</body>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js" integrity="sha384-C6RzsynM9kWDrMNeT87bh95OGNyZPhcTNXj1NW7RuBCsyN/o0jlpcV8Qyq46cDfL" crossorigin="anonymous"></script>
</html>
我把输入值像在图片中，但错误的值是输出。如果计算正确，则当前班级平均分的输出将为61.67%，剩余评估的要求等级的输出将为135%。
请帮助我解决这个问题。
1条答案
按热度按时间lnxxn5zx1#
我认为你在添加项目和阅读项目时混淆了numassignment的列表索引。
当你向列表中添加项目时，从1开始
从列表中阅读项目时，从0开始
如果你检查前两个项目的平均值（50，65），你会得到你在输出中看到的平均值57.5%。
为了解决这个问题，我会从索引1开始阅读你的成绩和权重，就像你添加它们一样。