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Woodworking Calculator

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<script>    function Show() {         with(document.Calculator) {             x = Display.value;             ft = (x - x % 12) / 12;             x = x - ft * 12;             if (ft == 0) ft = "";             Feet.value = ft;             Inch = x - x % 1;             if (Inch == 0) Inch = "";             Inches.value = Inch;             Num = (x % 1) * Denominator.options[(Denominator.length - 1)].value;             if (Num != 0) {                 Den = (Denominator.length - 1);                 while ((Num & 1) == 0) {                     if (Den <= 0) break;                     Den--;                     Num /= 2;                 }                 Denominator.selectedIndex = Den;             } else {                 Num = "";             }             Numerator.value = Num;         }     }  function verify(N) {     if (N == "") return 0;     return parseInt(N); }  function Get() {     with(document.Calculator) {         Ft = verify(Feet.value);         Inch = verify(Inches.value);         Num = verify(Numerator.value);         x = Ft * 12 + Inch + Num / Denominator.options[Denominator.selectedIndex].value;         Display.value = x;     }     return x; }  function Calc() {     with(document.Calculator) {         switch (Fn.value) {             case "+":                 Display.value = parseFloat(O1.value) + parseFloat(O2.value);                 break;             case "-":                 Display.value = parseFloat(O1.value) - parseFloat(O2.value);                 break;             case "/":                 Display.value = parseFloat(O1.value) / parseFloat(O3.value);                 O3.value = "";                 break;             case "*":                 Display.value = parseFloat(O1.value) * parseFloat(O3.value);                 O3.value = "";                 break;         }         Show();     } }  function Eq() {     with(document.Calculator) {         switch (parseInt(S.value)) {             case 1:                 break;             case 2:                 O2.value = Get();                 Calc();                 break;         }         O2.value = 0;         S.value = 3;     } }  function Func(F) {     with(document.Calculator) {         switch (parseInt(S.value)) {             case 2:                 O2.value = Get();                 Calc(); case 1:             case 3:                 O1.value = Get();                 Display.value = "";                 Show();                 O2.value = 0;                 Fn.value = F;                 S.value = 2;                 break;         }     } }  function C() {     with(document.Calculator) {         Display.value = "";         Denominator.selectedIndex = 0;         Show();         O1.value = O2.value = M.value = 0;         S.value = 1;     } }  function Ce() {     document.Calculator.Display.value = "";     Denominator.selectedIndex = 0;     Show(); }  function Mplus() {     with(document.Calculator) {         if (M.value == "") M.value = 0;         M.value = parseFloat(M.value) + parseFloat(Get());     } }  function Mrec() {     with(document.Calculator) {         Display.value = M.value;         Show();     } }  function Mclr() {     document.Calculator.M.value = ""; } </script>
<form name="Calculator"> <table width=420 border> <tr> <td align="center"> <table> <tr> <td align="center"> Feet <input type="text" size="4" name="Feet"> Inches <input type="text" size="3" name="Inches"> <input type="text" size="3" name="Numerator"> / <select name="Denominator"> <option value="2"> 2 </option> <option value="4"> 4 </option> <option value="8"> 8 </option> <option value="16"> 16 </option> <option value="32"> 32 </option> <option value="64"> 64 </option> <option value="128"> 128 </option> </select> <input type="hidden" size="12" name="Display" value="0"> <input type="hidden" size="12" name="O1" value="0"> <input type="hidden" size="12" name="O2" value="0"> <input type="hidden" size="12" name="Fn" value="+"> <input type="hidden" size="12" name="S" value="1"> <input type="hidden" size="12" name="M" value=""> </td> </tr> <tr> <td align="center"> <input type="button" value=" + " onclick="Func('+')"> <input type="button" value=" - " onclick="Func('-')"> </td> </tr> <tr> <td align="center"> <input type="button" value=" = " onclick="Eq()"> <input type="button" value=" C " onclick="C()"> <input type="button" value="CE" onclick="Ce()"> </td> </tr> <tr> <td align="center"> <input type="button" value=" X " onclick="Func('*')"> <input type="button" value=" / " onclick="Func('/')"> <input type="text" size="8" name="O3"> </td> </tr> <tr> <td align="center"></td> </tr> <tr> <td align="center"> <input type="button" value="M+" onclick="Mplus()"> <input type="button" value="MR" onclick="Mrec()"> <input type="button" value="MC" onclick="Mclr()"> </td> </tr> </table> <table> <tr> <td> <strong>Add/Subtract</strong><br> Enter a measurement in feet, inches, fraction<br> Click + or -<br> Enter another measurement in feet, inches, fraction<br> Click =<br> <br> <strong>Multiply/Divide</strong><br> Enter a measurement in feet, inches, fraction<br> Click X or /<br> Enter a number in the X / Box<br> Click =<br> </td> </tr> </table> </td> </tr> </table></form>

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