Handling Maths In Strange Way?

Aug 25, 2010

I have javascript calculating the total price of all the products in a shoppping cart. The prices are in the format of 10.99 or 5.50 or 10 ete.g if there are five items bought for 10.99 and 1 bought for 10, the script will multiply 10.99 by 3, then multiply 10 by one, then add the two results.

The resulting number is sometimes right, but quite often it ads an extra '000000002' or so to the amount??

[Code]...

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Maths Game

Oct 3, 2003

Have a look at this maths game I made. It tests you on adding, subtracting, multiplying and dividing and has three different levels.

Note-you must save the code below as mathsgamefinal.htm for the reset button to work.


<html>



<head>

<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">

<meta http-equiv="Content-Language" content="en-gb">

<title></title>

</head>



<body bgcolor="#FF0000">



<script type="text/javascript">



function next1(){

var outof=document.getElementById('outof').value;

if(document.getElementById('next').value=="Next" && document.getElementById('type').value=="a"){document.getElementById('next').value='Enter' add(); document.getElementById('answer').value='answer'}
else if(document.getElementById('next').value=="Next" && document.getElementById('type').value=="m"){document.getElementById('next').value='Enter' times(); document.getElementById('answer').value='answer'}
else if(document.getElementById('next').value=="Next" && document.getElementById('type').value=="t"){document.getElementById('next').value='Enter' minus(); document.getElementById('answer').value='answer'}
else if(document.getElementById('next').value=="Next" && document.getElementById('type').value=="d"){document.getElementById('next').value='Enter' divide(); document.getElementById('answer').value='answer'}

else if(document.getElementById('next').value=="Enter" && document.getElementById('answer').value==(cr)){ document.getElementById('question').value='Correct' document.getElementById('next').value='Next' document.getElementById('outof').value=parseInt(document.getElementById('outof').value)+1; document.getElementById('score').value=parseInt(document.getElementById('score').value)+1; pc();}

else{ document.getElementById('question').value='Wrong. Answer= '+cr; document.getElementById('next').value='Next' document.getElementById('outof').value=parseInt(document.getElementById('outof').value)+1; pc();}

document.getElementById('answer').select();
}



function add(){
ea1=(Math.floor(Math.random() * (1 - 10)) + 10);
ea2=(Math.floor(Math.random() * (1 - 10)) + 10);
ma1=(Math.floor(Math.random() * (21 - 49)) + 49);
ma2=(Math.floor(Math.random() * (21 - 49)) + 49);
ha1=(Math.floor(Math.random() * (111 - 299)) + 299);
ha2=(Math.floor(Math.random() * (111 - 299)) + 299);

if(document.getElementById('level').value=="e"){document.getElementById('question').value=ea1+' plus '+ea2; cr=ea1+ea2}
if(document.getElementById('level').value=="m"){document.getElementById('question').value=ma1+' plus '+ma2; cr=ma1+ma2}
if(document.getElementById('level').value=="h"){document.getElementById('question').value=ha1+' plus '+ha2; cr=ha1+ha2}
}
function times(){
em1=(Math.floor(Math.random() * (2 - 10)) + 10);
em2=(Math.floor(Math.random() * (2 - 10)) + 10);
mm1=(Math.floor(Math.random() * (11 - 19)) + 19);
mm2=(Math.floor(Math.random() * (6 - 12)) + 12);
hm1=(Math.floor(Math.random() * (21 - 29)) + 29);
hm2=(Math.floor(Math.random() * (21 - 29)) + 29);

if(document.getElementById('level').value=="e"){document.getElementById('question').value=em1+' times '+em2; cr=em1*em2}
if(document.getElementById('level').value=="m"){document.getElementById('question').value=mm1+' times '+mm2; cr=mm1*mm2}
if(document.getElementById('level').value=="h"){document.getElementById('question').value=hm1+' times '+hm2; cr=hm1*hm2}


}

function minus(){
et1=(Math.floor(Math.random() * (10 - 20)) + 20);
et2=(Math.floor(Math.random() * (1 - 10)) + 10);
mt1=(Math.floor(Math.random() * (50 - 99)) + 99);
mt2=(Math.floor(Math.random() * (20 - 50)) + 50);
ht1=(Math.floor(Math.random() * (350 - 1000)) + 1000);
ht2=(Math.floor(Math.random() * (350 - 1000)) + 1000);

if(document.getElementById('level').value=="e"){document.getElementById('question').value=et1+' minus '+et2; cr=et1-et2}
if(document.getElementById('level').value=="m"){document.getElementById('question').value=mt1+' minus '+mt2; cr=mt1-mt2}
if(document.getElementById('level').value=="h"){document.getElementById('question').value=ht1+' minus '+ht2; cr=ht1-ht2}


}
function divide(){
ed1=(Math.floor(Math.random() * (2 - 10)) + 10);
ed2=(Math.floor(Math.random() * (2 - 10)) + 10);
md1=(Math.floor(Math.random() * (11 - 19)) + 19);
md2=(Math.floor(Math.random() * (11 - 19)) + 19);
hd1=(Math.floor(Math.random() * (21 - 29)) + 29);
hd2=(Math.floor(Math.random() * (21 - 29)) + 29);
ed3=ed1*ed2;
md3=md1*md2;
hd3=hd1*hd2;

if(document.getElementById('level').value=="e"){document.getElementById('question').value=ed3+' divided by '+ed2; cr=ed1}
if(document.getElementById('level').value=="m"){document.getElementById('question').value=md3+' divided by '+md2; cr=md1}
if(document.getElementById('level').value=="h"){document.getElementById('question').value=hd3+' divided by '+hd2; cr=hd1}
}


function answerreset(){
if(document.getElementById('answer').value=="answer"){document.getElementById('answer').value=''}
}

function pc(){
document.getElementById('scorepercent').value=document.getElementById('score').value/document.getElementById('outof').value*100;
document.getElementById('scorepercent').value=Math.round(document.getElementById('scorepercent').val ue);
}
</script>

<table border="0" width="198" height="180" bordercolor="#000000" style="background-color: #FFFF00; border-style: solid">

<tr>

<td height="33" width="99" colspan="2">

<p align="center">

<select size="1" name="type" id='type'>

<option value="a" selected>Add</option>

<option value="t">Take away</option>

<option value="m">Multiply</option>

<option value="d">Divide</option>

</select></p>

</td>

<td height="36" width="99" colspan="2">

<p align="center">

<select size="1" name="level" id=level>

<option value="e" selected>Easy</option>

<option value="m">Medium</option>

<option value="h">Hard</option>

</select></p>

</td>

</tr>

<tr>

<td height="36" width="198" colspan="4">

<p align="left">

<input type="button" name="T1" id='question' value="Click next to begin" style="background-color: #FFFF00; border: 0 solid #FFFF00">

</p>

</td>

</tr>

<tr>

<td height="33" width="66">

<p align="center"><input type="text" name="answer" size="6" id='answer' onclick=answerreset()></td>

<td height="36" width="66" colspan="2">

<p align="center"><button onclick='next1()' id='next'>Next</button></td>

<td height="33" width="66">

<p align="center"><button onclick='window.location="mathsgamefinal.htm"'>Reset</button></td>

</tr>

<tr>

<td height="36" width="66">

<p align="center">Score %:</td>

<td height="33" width="66" colspan="2">

<p align="center">Score Marks:</td>

<td height="33" width="66">

<p align="center">Out of:</td>

</tr>

<tr>

<td height="33" width="66">

<p align="center"><input type="button" name="T1" size="3" id=scorepercent value="0"></td>

<td height="33" width="66" colspan="2">

<p align="center"><input type="button" name="score" size="3" id=score value="0"></td>

<td height="36" width="66">

<p align="center"><input type="button" name="outof" size="3" id=outof value="0"></td>

</tr>
</table>
</body>
</html>



Any feedback would be much apprieciated...

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