本文实例讲述了php编程实现简单的网页版计算器功能。分享给大家供大家参考,具体如下:
如何通过php代码来实现一个网页版的计算器的简单功能?下面就是通过php基础知识来做的网页版计算器,功能只有“加减剩除求余”,其他的一些计算功能可扩展。
实现简单计算器的具体php代码如下(这是php文件jsq.php的全部代码):
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<html> <head> <title>这是一个网页版的简单计算器</title> <meta http-equiv= "content-type" content= "text/html;chaset=utf-8" > </head> <?php $num1 =true; $num2 =true; $numa =true; $numb =true; $message = "" ; if (isset( $_get [ "sub" ])){ if ( $_get [ "num1" ]== "" ){ $num1 =false; $message .= "第一个数不能为空" ; } if ( $_get [ "num2" ]== "" ){ $num1 =false; $message .= "第二个数不能为空" ; } if (! is_numeric ( $_get [ "num1" ])){ $numa =false; $message .= "第一个数应该是数字" ; } if (! is_numeric ( $_get [ "num2" ])){ $numb =false; $message .= "第二个数应该是数字" ; } if ( $num1 && $num2 && $numa && $numb ){ $sum =0; switch ( $_get [ "ysf" ]){ case "+" : $sum = $_get [ "num1" ]+ $_get [ "num2" ]; break ; case "-" : $sum = $_get [ "num1" ]- $_get [ "num2" ]; break ; case "x" : $sum = $_get [ "num1" ]* $_get [ "num2" ]; break ; case "/" : $sum = $_get [ "num1" ]/ $_get [ "num2" ]; break ; case "%" : $sum = $_get [ "num1" ]% $_get [ "num2" ]; break ; } } } ?> <body> <table align= "center" border= "1" width= "500" > <caption><h1>网页计算器</h1></caption> <form action= "jsq.php" > <tr> <td> <input type= "text" size= "5" name= "num1" value= "<?php echo $_get[" num1 "] ?>" > </td> <td> <select name= "ysf" > <option value= "+" <?php if ( $_get [ "ysf" ]== "+" ) echo "selected" ?>>+</option> <option value= "-" <?php if ( $_get [ "ysf" ]== "-" ) echo "selected" ?>>-</option> <option value= "x" <?php echo $_get [ "ysf" ]== "x" ? "selected" : "" ?>>x</option> <option value= "/" <?php echo $_get [ "ysf" ]== "/" ? "selected" : "" ?>>/</option> <option value= "%" <?php echo $_get [ "ysf" ]== "%" ? "selected" : "" ?>>%</option> </select> </td> <td> <input type= "text" size= "5" name= "num2" value= "<?php echo $_get[" num2 "] ?>" > </td> <td> <input type= "submit" name= "sub" value= "计算" > </td> <?php if (isset( $_get [ "sub" ])){ echo '<tr><td colspan="4">' ; if ( $num1 && $num2 && $numa && $numb ){ echo "结果:" . $_get [ "num1" ]. " " . $_get [ "ysf" ]. " " . $_get [ "num2" ]. " = " . $sum ; } else { echo $message ; } echo '</td></tr>' ; } ?> </form> </table> </body> </html> |
注意:上述文件jsq.php需要上传至web服务器的根目录才能被正确解释执行。
效果如图所示:
希望本文所述对大家php程序设计有所帮助。