PHP實現計算器小功能
阿新 • • 發佈：2020-08-31
本文例項為大家分享了PHP實現計算器小功能的具體程式碼，供大家參考，具體內容如下
<?php
if (isset($_POST['sub'])) {
$f = true;
$error = "有以上問題: <br>";
if ($_POST["num1"] == "") {
$f = false;
$error .= "第一個數不能為空.<br>";
} else {
if(!is_numeric($_POST[num1])) {
$f = false;
$error .= "第一個數字不是數字.<br>";
}
}
if ($_POST['num2'] == "") {
$f = false;
$error .= "第二個數字不能為空.<br>";
} else {
if (!is_numeric($_POST['num2'])) {
$f = false;
$error .= "第二個數字不是數字<br>";
}
}
if ($f) {
switch ($_POST['ysf']) {
case '+': $sum = $_POST['num1']+$_POST['num2'];
break;
case '-': $sum = $_POST['num1']-$_POST['num2'];
break;
case '*': $sum = $_POST['num1']*$_POST['num2'];
break;
case '/': $sum = $_POST['num1']/$_POST['num2'];
break;
case '%': $sum = $_POST['num1']%$_POST['num2'];
break;
}
}
}
?>
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>簡易計算器</title>
<style>
* {
margin: 0px;
padding: 0px;
}
#contains {
width: 400px;
margin: 50px auto;
}
h1 {
width: 400px;
text-align: center;
color: #0F0;
}
table {
margin-top: 20px;
width: 400px;
}
input {
background: yellow;
border-radius: 20px;
}
input:hover {
background: green;
}
select {
background: yellow;
border-radius: 20px;
}
td {
background: #3F0;
text-align: center;
height: 30px;
}
#sub {
border-radius: 25px;
width: 50px;
}
</style>
</head>
<body>
<div id="contains">
<h1>簡易計算器</h1>
<form action="Calculator.php" method="post">
<table border="0">
<tr>
<td><input type="text" name="num1" value="<?php echo $_POST['num1'];?>" size="3"/></td>
<td>
<select name="ysf">
<option <?php if($_POST['ysf'] == "+") echo "selected";?> value="+">+</option>
<option <?php if($_POST['ysf'] == "-") echo "selected";?> value="-">-</option>
<option <?php if($_POST['ysf'] == "*") echo "selected";?> value="*">*</option>
<option <?php if($_POST['ysf'] == "/") echo "selected";?> value="/">/</option>
<option <?php if($_POST['ysf'] == "%") echo "selected";?> value="%">%</option>
</select>
</td>
<td><input type="text" name="num2" value="<?php echo $_POST['num2'];?>" size="3"/></td>
<td><input type="submit" id = 'sub' name="sub" value="計算"/></td>
</tr>
<tr>
<td colspan="4">
<?php
if ($f) {
echo "計算結果: {$_POST['num1']}{$_POST['ysf']}{$_POST['num2']} = {$sum}";
} else {
echo "$error";
}
?>
</td>
</tr>
</table>
</form>
</div>
</body>
</html>
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支援我們。