PHP学习实例—1（简易计算器）

来源：互联网发布：京东mac客户端下载编辑：程序博客网时间：2024/04/30 04:06
<?php  if (isset($_POST['sub'])) {$f = true;$error = "有以上问题: <br>";if ($_POST["num1"] == "") {  $f = false;$error .= "第一个数不能为空.<br>";} else {    if(!is_numeric($_POST[num1])) {      $f = false;    $error .= "第一个数字不是数字.<br>";  }}if ($_POST['num2'] == "") {$f = false;$error .= "第二个数字不能为空.<br>";} else {    if (!is_numeric($_POST['num2'])) {  $f = false;$error .= "第二个数字不是数字<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>简易计算器</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>简易计算器</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 $_POST['num2'];?>" size="3"/></td><td><input type="submit" id = 'sub' name="sub" value="计算"/></td></tr><tr>  <td colspan="4">  <?php  if ($f) {  echo "计算结果: <b>{$_POST['num1']}{$_POST['ysf']}{$_POST['num2']} = {$sum}</b>";} else {  echo "<b>$error</b>";}?></td></tr></table></form></div></body></html>
0 0