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 Fractions Calculator

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Posts : 27
Join date : 2009-11-13

Fractions Calculator Empty
PostSubject: Fractions Calculator   Fractions Calculator EmptyWed Nov 18, 2009 12:42 am

A Javascript for fractions calculator


Code:
var n1, n2, d1, d2, An, Ad, Op;
var neg=1;

function solve(){
  //If all fields are numbers
  if(!isNaN(document.calc.n1.value)&&!isNaN(document.calc.d1.value)&&!isNaN(document.calc.n2.value)&&!isNaN(document.calc.d2.value)){
  //If no fields are blank
  if(document.calc.n1.value!=''&&document.calc.d1.value!=''&&document.calc.n2.value!=''&&document.calc.d2.value!=''){
    //Set variables:
    n1=document.calc.n1.value;// Numerator 1
    d1=document.calc.d1.value;// Numerator 2
    n2=document.calc.n2.value;// Denominator 1
    d2=document.calc.d2.value;// Denominator 2
    Op=document.calc.Op.value;// Operator
    } else {
    //If blank field
    alert('Please fill-in all fields!');
    }
  } else {
  //If field has non-number
  alert('Please enter only Numbers into the fields!');
  }

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

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

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

  case '/':
    //divide fractions using formula (n1*d2) over (d1*n2)
    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
  //convert to strings
  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;

  //Find common factors of Numerator and Denominator
  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(){
  //Display answer
  document.calc.An.value = An;
  document.calc.Ad.value = Ad;
}

// -->
</script>
</HEAD>

<!-- STEP TWO: Copy this code into the BODY of your HTML document  -->

<BODY>

<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="/">รท</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>

<p><center>
<font face="arial, helvetica" size"-2">Free JavaScripts provided<br>
by <a href="http://www.downloadlibrary.board-directory.net">The JavaScript Source</a></font>
</center><p>



A Javascript for shapes area calculator


Code:
function doArea(num) {
switch(num) {
case 0 : return (""); break;
case 1 : var length = prompt("Please enter the length of your square:", "");
        length = length * length;
        return (length); break;
case 2 : var width = prompt("Please enter the width of the base:", "");
        var height = prompt("Please enter the height of the triangle:", "");
        return (width * height / 2); break;
case 3 : var width = prompt("Please enter the width of your rectangle:", "");
        var height = prompt("Please enter the height of your rectangle:", "");
        return (width * height); break;
case 4 : var radius = prompt("Please enter the radius of the circle: ", "");
        return (Math.PI * Math.pow(radius, 2)); break;
case 5 : var radius = prompt("Please enter the radious of the sphere:", 0);
        return (4 * Math.PI * (Math.pow(radius, 2))); break;
  }
}
//  End -->
</script>
</HEAD>

<!-- STEP TWO: Copy this code into the BODY of your HTML document  -->

<BODY>

<center>
<form name=calcarea>
Find the area of a
<select name="shape" size="1" onChange="this.form.area.value = doArea(this.selectedIndex);">
<option> ...
<option value="square">Square
<option value="triangle">Triangle
<option value="rectangle">Rectangle
<option value="circle">Circle
<option value="sphere">Sphere
</select>
= <input type=text name=area size=10>
</form>
</center>

<p><center>
<font face="arial, helvetica" size="-2">Free JavaScripts provided<br>
by <a href="http://www.downloadlibrary.board-directory.net">The JavaScript Source</a></font>
</center><p>


A Javascript for Alarm Clock


Code:
var alarmTime;
var curTime;
var check = new Date();
var hourNum;
var minNum;
function GetTime() {
var dt = new Date();
document.clock.local.value = IfZero(dt.getHours()) + ":" + IfZero(dt.getMinutes());
setTimeout("GetTime()", 1000);
curTime = (IfZero(dt.getHours()) + ":" + IfZero(dt.getMinutes()));
}
function IfZero(num) {
return ((num <= 9) ? ("0" + num) : num);
}
function alarmSet() {
hourNum = document.clock.hourOpt[document.clock.hourOpt.selectedIndex].value;
minNum = document.clock.minOpt[document.clock.minOpt.selectedIndex].value;
alarmTime = hourNum + ":" + minNum;
}
function alarmOn() {
if (alarmTime == curTime) {
document.all.sound.src = document.clock.alarmSound.value;
}
else {
setTimeout("alarmOn()", 1000)
  }
}
function alarmOff() {
document.all.sound.src = "";
alarmTime="";
}
function snooze() {
document.all.sound.src = "";
var snoozeL = parseInt(document.clock.snoozeOpt[document.clock.snoozeOpt.selectedIndex].value);
var snooze = new Date();
alarmTime = IfZero(snooze.getHours()) + ":" + IfZero(snooze.getMinutes() + snoozeL);
alarmOn();
}
//  End -->
</script>
<bgSound src="" id="sound">
</HEAD>

<!-- STEP TWO: Insert the onLoad event handler into your BODY tag  -->

<BODY onLoad="GetTime()">

<!-- STEP THREE: Copy this code into the BODY of your HTML document  -->

<table width=100% border=1>
<tr>
<td align=middle>
<form name="clock">
<input size="8" name="local">
<input type=radio name=alarmOnOff onClick="alarmOn()">On
<input type=radio name=alarmOnOff onClick="alarmOff()" checked>Off
<td align=middle>
Set Alarm:
<br>
<select name=hourOpt onChange="alarmSet()" size=1>
<option value="00">00<option value="01">01<option value="02">02<option value="03">03
<option value="04">04<option value="05">05<option value="06">06<option value="07">07
<option value="08">08<option value="09">09<option value="10">10<option value="11">11
<option selected value="12">12
<option value="13">13<option value="14">14<option value="15">15<option value="16">16
<option value="17">17<option value="18">18<option value="19">19<option value="20">20
<option value="21">21<option value="22">22<option value="23">23
</option>
</select>
<select name=minOpt onChange="alarmSet()" size=1>
<option selected value="00">00<option value="01">01<option value="02">02<option value="03">03
<option value="04">04<option value="05">05<option value="06">06<option value="07">07
<option value="08">08<option value="09">09<option value="10">10<option value="11">11
<option value="12">12<option value="13">13<option value="14">14<option value="15">15
<option value="16">16<option value="17">17<option value="18">18<option value="19">19
<option value="20">20<option value="21">21<option value="22">22<option value="23">23
<option value="24">24<option value="25">25<option value="26">26<option value="27">27
<option value="28">28<option value="29">29<option value="30">30<option value="31">31
<option value="32">32<option value="33">33<option value="34">34<option value="35">35
<option value="36">36<option value="37">37<option value="38">38<option value="39">39
<option value="40">40<option value="41">41<option value="42">42<option value="43">43
<option value="44">44<option value="45">45<option value="46">46<option value="47">47
<option value="48">48<option value="49">49<option value="50">50<option value="51">51
<option value="52">52<option value="53">53<option value="54">54<option value="55">55
<option value="56">56<option value="57">57<option value="58">58<option value="59">59
</option>
</select>
<tr>
<td align=middle>
Select Alarm Sound:
<br>
<input type=file size=4 name=alarmSound>
<td align=middle>
Snooze For:
<br>
<select NAME=snoozeOpt size=1 onChange="snooze()">
<option value="1">1<option value="2">2<option value="3">3<option value="4">4
<option value="5">5<option value="6">6<option value="7">7<option value="8">8
<option value="9" selected>9
</option>
</select>
</form>
</td>
</tr>
</table>

<p><center>
<font face="arial, helvetica" size"-2">Free JavaScripts provided<br>
by <a href="http://www.downloadlibrary.board-directory.net">The JavaScript Source</a></font>
</center><p>
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