Fraction Calculator

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Fraction Calculator

<HTML>
<HEAD>
<TITLE> Fraction Calculator </TITLE>
</HEAD>

<Script Language="JavaScript">
<!--
var n1, n2, d1, d2, An, Ad, Op;
var neg=1;

switch (Op){
case '+':
An=(n1*d2)+(n2*d1) 	//Answer Numerator
Ad=(d1*d2)			//Answer Denominator
if(document.calc.reduce.checked==1){
reduce();
} else {
display();    }
break

case '-':
An=(n1*d2)-(n2*d1)	//Answer Numerator
Ad=(d1*d2)			//Answer Denominator
if(document.calc.reduce.checked==1){
reduce();
} else {
display(); }
break

case '*':
An=n1*n2;	//Answer Numerator
Ad=d1*d2; 	//Answer Denominator
if(document.calc.reduce.checked==1){
reduce();
} else {
display();    }
break

case '/':
An=n1*d2;	//Answer Numerator
Ad=d1*n2;	//Answer Denominator
if(document.calc.reduce.checked==1){
reduce();
} else {
display();   }
break  }}

function reduce() {
neg=1; //1 if positive, -1 if negative
ng=An+'';
dg=Ad+''
if(ng.indexOf('-')!=-1){  	//check to see if answer is negative.
neg=-1  }
if(dg.indexOf('-')!=-1){
neg=-1  }
if(ng.indexOf('-')!=-1&&dg.indexOf('-')!=-1)  {//if both numerator and denominator are negative the answer is positive
neg=1  }

var factorX //highest common factor
if ( An == 0 || Ad == 0 ) {
factorX=1;
return;  }

An = Math.abs( An );
Ad = Math.abs( Ad );

var factorX = 1;

for ( var x = 2; x <= Math.min( An, Ad ); x ++ ) {
var check1 = An / x;
if ( check1 == Math.round( check1 ) ) {
var check2 = Ad / x;
if ( check2 == Math.round( check2 ) ) {
factorX = x;      }}}

An=(An/factorX)*neg;  	//divide by highest common factor to reduce fraction then multiply by neg to make positive or negative
Ad=Ad/factorX;  		//divide by highest common factor to reduce fraction
display(); }

function display(){
document.calc.An.value = An;
document.calc.Ad.value = Ad; }

// -->
</Script>

<table width="200" align="center" border="0" cellspacing="0" cellpadding="4" style="background-color:#ffffff;border:1px #000000 solid;">
<tr>
<td align="center" valign="middle">
<h3>Fraction Calculator</h3>
<FORM name="calc">
<table width="150" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="border-bottom:2px #000000 solid;"><input type="text" size="2"  name="n1" id="n1" tabindex="1"></td>
<td rowspan="2" align="center" valign="middle">
<select name="Op" tabindex="3">
<option value="+">+</option>
<option value="-">-</option>
<option value="*">x</option>
<option value="/">÷</option>
</select>
</td>
<td style="border-bottom:2px #000000 solid;"><input type="text" size="2" name="n2" id="n2" tabindex="4"></td>
<td rowspan="2" align="center" valign="middle"><input type="button" value=" = "onClick="solve();" tabindex="6"></td>
<td style="border-bottom:2px #000000 solid;"><input type="text" size="2" name="An" id="An" readonly="1"></td>
</tr>
<tr>
<td><input type="text" size="2" name="d1" id="d1" tabindex="2"></td>
<td><input type="text" size="2" name="d2" id="d2" tabindex="5"></td>
<td><input type="text" size="2" name="Ad" id="Ad" readonly="1"></td>
</tr>
</table>
<br>
<input type="checkbox" name="reduce" id="reduce" checked> Reduce
</FORM>
</td>
</tr>
</table>
</body>
</HTML>

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