Looking for a long time, found little information on the internet, so want to write their own hands, slowly found many problems, their own algorithm, write a short calculation formula is OK, long on the hang, and then long I am afraid to panic.
One day do MySQL suddenly found that the original MySQL function so powerful, you can directly calculate the string ... Haha, this will be happy.
The code is also super simple to do an AJAX calculator
There's a wrong hint and you can always display the input formula.
Interested friends can see more features can be developed on their own
Demo Address: http://www.jianlila.com/jsq.php
Jquer.js yourself to download
jsq1.php
Copy Code code as follows:
<?php
of the linked database
$db =mysql_connect ("localhost", "root", "123");
Header ("content-type:text/html;charset=gb2312");
$str =iconv (' utf-8 ', ' GBK ', trim ($_post[' t_ask '));
$str =str_replace ("", "", Str_replace ("\ r \ n", "", $str));
$str =str_replace ("(", "(", $str);
$str =str_replace (")", ")", $str);
/* Trigonometric Replacement * *
$str =preg_replace ("/sin\ (. *) \)/is", "Sin (\${1}*pi ()/180)", $str);/Replace Sin
$str =preg_replace ("/cos\ (. *) \)/is", cos (\${1}*PI ()/180), $str);//replace Cos
$str =preg_replace ("/tan\ (. *) \)/is", "Tan (\${1}*pi ()/180)", $str);//Replace Tan
$str =preg_replace ("/cot\ (. *) \)/is", "1/tan (\${1}*pi ()/180)", $str);//Replace cotangent
$str =preg_replace ("/asin\ (. *) \)/is", "ASIN (\${1}/PI () *180) *180/pi ()", $str);/Anyway strings
$str =preg_replace ("/acos\ (. *) \)/is", "ACOs (\${1}/pi () *180) *180/pi ()", $str);/anti-cosine
$str =preg_replace ("/atan\ (. *) \)/is", "Atan (\${1}/pi () *180) *180/pi ()", $str);
$sql = "select". $str;
$res =mysql_query ($sql, $db) or Die (' <font color=red> the formula you entered has an error </font> ');
$rs =mysql_fetch_array ($res);
echo $rs [0];
?>
jsq.php
Copy Code code as follows:
<title> Handwriting Input Calculator </title>
<meta name= "keywords" content= "online calculator, input formula direct calculation, handwriting calculator"/>
<meta name= "description" content= "online calculator, handwriting input calculator, input formula direct calculation"/>
<script src= "Jquery.js" language= "JavaScript" ></script>
<script language= "JavaScript" >
$ (function () {
$ ("#t_ask"). KeyUp (function () {
$.post (
"Jsq1.php",
{
T_ask: $ ("#t_ask"). Val ()
},function (Data,textstatus)
{
$ ("#res"). HTML (data);
}
);
});
});
</script>
<body>
<table width= "border=" 0 "align=" center "cellpadding=" 0 "cellspacing=" 0 ">
<tr>
<TD align= "center" height= "+" ></tr>
</table>
<table width= "border=" 0 "align=" center "cellpadding=" 0 "cellspacing=" 0 ">
<tr>
<TD height= "align=" "Center" > Here you can calculate your handwriting. Oh, don't try! <a href= "http://www.jianlila.com" > Back home </a></td>
</tr>
</table>
<form method= "POST" >
<table width= "border=" 0 "align=" center "cellpadding=" 0 "cellspacing=" 0 ">
<tr>
<TD width= "27%" align= "right" > Calculation formula:</td>
<TD width= "73%" ><textarea name= "T_ask" cols= "" rows= "6" id= "T_ask" ></textarea></td>
</tr>
<tr>
<TD height= "align=" "right" >=</td>
<td><div id= "res" ></div></td>
</tr>
<tr>
<TD height= "align=" "right" ></td>
<td><input type= "button" Name= "TJ" id= "TJ" value= "button"/>
<input type= "reset" name= "QC" id= "QC" value= "reset"/></td>
</tr>
</table>
<table width= "border=" 0 "align=" center "cellpadding=" 0 "cellspacing=" 0 ">
<tr>
<td><p> Description: <br/>
Trigonometric function:
<p>sin (60) sine cos (60) cosine tan (60) tangent cot (60) cotangent
<p>asin (0.5) inverse chord acos (0.5)
Anti-cosine atan (0.5) Anyway tangent
<p>abs (-1) =1 absolute value ceil (0.1) =1 into a
<p> Index logarithm
<p>exp (float arg)//Calculation <strong>e</strong> (bottom of natural logarithm) index
<p>log (10,100) =2//natural logarithm pow (2,4) = 16 exponent sqrt (4) = 2 square root
<p><br/>
</td>
</tr>
</table>
</form>
</body>
