Calculadora semelhante a calculadora do Windows

Calculator

<style type="text/css"> <!-- body {font-family: helvetica} p {font-size: 12pt} .red {color: red} .blue {color: blue} --> </style> <SCRIPT LANGUAGE="JavaScript"> <!-- Original: Steve Dulaney --> <!-- Web Site: http://www.hmhd.com/steve --> <!-- This script and many more are available free online at --> <!-- The JavaScript Source!! http://javascript.internet.com --> <!-- Begin var Memory = 0; var Number1 = ""; var Number2 = ""; var NewNumber = "blank"; var opvalue = ""; function Display(displaynumber) { document.calculator.answer.value = displaynumber; } function MemoryClear() { Memory = 0; document.calculator.mem.value = ""; } function MemoryRecall(answer) { if(NewNumber != "blank") { Number2 += answer; } else { Number1 = answer; } NewNumber = "blank"; Display(answer); } function MemorySubtract(answer) { Memory = Memory - eval(answer); } function MemoryAdd(answer) { Memory = Memory + eval(answer); document.calculator.mem.value = " M "; NewNumber = "blank"; } function ClearCalc() { Number1 = ""; Number2 = ""; NewNumber = "blank"; Display(""); } function Backspace(answer) { answerlength = answer.length; answer = answer.substring(0, answerlength - 1); if (Number2 != "") { Number2 = answer.toString(); Display(Number2); } else { Number1 = answer.toString(); Display(Number1); } } function CECalc() { Number2 = ""; NewNumber = "yes"; Display(""); } function CheckNumber(answer) { if(answer == ".") { Number = document.calculator.answer.value; if(Number.indexOf(".") != -1) { answer = ""; } } if(NewNumber == "yes") { Number2 += answer; Display(Number2); } else { if(NewNumber == "blank") { Number1 = answer; Number2 = ""; NewNumber = "no"; } else { Number1 += answer; } Display(Number1); } } function AddButton(x) { if(x == 1) EqualButton(); if(Number2 != "") { Number1 = parseFloat(Number1) + parseFloat(Number2); } NewNumber = "yes"; opvalue = '+'; Display(Number1); } function SubButton(x) { if(x == 1) EqualButton(); if(Number2 != "") { Number1 = parseFloat(Number1) - parseFloat(Number2); } NewNumber = "yes"; opvalue = '-'; Display(Number1); } function MultButton(x) { if(x == 1) EqualButton(); if(Number2 != "") { Number1 = parseFloat(Number1) * parseFloat(Number2); } NewNumber = "yes"; opvalue = '*'; Display(Number1); } function DivButton(x) { if(x == 1) EqualButton(); if(Number2 != "") { Number1 = parseFloat(Number1) / parseFloat(Number2); } NewNumber = "yes"; opvalue = '/'; Display(Number1); } function SqrtButton() { Number1 = Math.sqrt(Number1); NewNumber = "blank"; Display(Number1); } function PercentButton() { if(NewNumber != "blank") { Number2 *= .01; NewNumber = "blank"; Display(Number2); } } function RecipButton() { Number1 = 1/Number1; NewNumber = "blank"; Display(Number1); } function NegateButton() { Number1 = parseFloat(-Number1); NewNumber = "no"; Display(Number1); } function EqualButton() { if(opvalue == '+') AddButton(0); if(opvalue == '-') SubButton(0); if(opvalue == '*') MultButton(0); if(opvalue == '/') DivButton(0); Number2 = ""; opvalue = ""; } // End --> </script> <center> <form name="calculator"> <table bgcolor="#aaaaaa" width=220> <tr><td> <table bgcolor="#cccccc" border=1> <tr><td> <table border=0 cellpadding=0> <tr><td bgcolor="#000080"><b style="color:white">Calculator</b></td></tr> <tr><td> <table width="100%" border=0> <tr><td colspan=6><input type="text" name="answer" size=30 maxlength=30 onChange="CheckNumber(this.value)"></td></tr> <tr><td colspan=6> <table border=0 cellpadding=0> <tr><td> <input type="text" name="mem" size=3 maxlength=3> <input type="button" name="backspace" class="red" value="Backspace" onClick="Backspace(document.calculator.answer.value); return false;"> <input type="button" name="CE" class="red" value=" CE " onClick="CECalc(); return false;"> <input type="reset" name="C" class="red" value=" C " onClick="ClearCalc(); return false;"> </td></tr> </table> </td></tr> <tr><td><input type="button" name="MC" class="red" value=" MC " onClick="MemoryClear(); return false;"></td> <td><input type="button" name="calc7" class="blue" value=" 7 " onClick="CheckNumber('7'); return false;"></td> <td><input type="button" name="calc8" class="blue" value=" 8 " onClick="CheckNumber('8'); return false;"></td> <td><input type="button" name="calc9" class="blue" value=" 9 " onClick="CheckNumber('9'); return false;"></td> <td><input type="button" name="divide" class="red" value=" / " onClick="DivButton(1); return false;"></td> <td><input type="button" name="sqrt" class="blue" value="sqrt" onClick="SqrtButton(); return false;"></td></tr> <tr><td><input type="button" name="MR" class="red" value=" MR " onClick="MemoryRecall(Memory); return false;"></td> <td><input type="button" name="calc4" class="blue" value=" 4 " onClick="CheckNumber('4'); return false;"></td> <td><input type="button" name="calc5" class="blue" value=" 5 " onClick="CheckNumber('5'); return false;"></td> <td><input type="button" name="calc6" class="blue" value=" 6 " onClick="CheckNumber('6'); return false;"></td> <td><input type="button" name="multiply" class="red" value=" * " onClick="MultButton(1); return false;"></td> <td><input type="button" name="percent" class="blue" value=" % " onClick="PercentButton(); return false;"></td></tr> <tr><td><input type="button" name="MS" class="red" value=" MS " onClick="MemorySubtract(document.calculator.answer.value); return false;"></td> <td><input type="button" name="calc1" class="blue" value=" 1 " onClick="CheckNumber('1'); return false;"></td> <td><input type="button" name="calc2" class="blue" value=" 2 " onClick="CheckNumber('2'); return false;"></td> <td><input type="button" name="calc3" class="blue" value=" 3 " onClick="CheckNumber('3'); return false;"></td> <td><input type="button" name="minus" class="red" value=" - " onClick="SubButton(1); return false;"></td> <td><input type="button" name="recip" class="blue" value="1/x " onClick="RecipButton(); return false;"></td></tr> <tr><td><input type="button" name="Mplus" class="red" value=" M+ " onClick="MemoryAdd(document.calculator.answer.value); return false;"></td> <td><input type="button" name="calc0" class="blue" value=" 0 " onClick="CheckNumber('0'); return false;"></td> <td><input type="button" name="negate" class="blue" value="+/- " onClick="NegateButton(); return false;"></td> <td><input type="button" name="dot" class="blue" value=" . " onClick="CheckNumber('.'); return false;"></td> <td><input type="button" name="plus" class="red" value=" + " onClick="AddButton(1); return false;"></td> <td><input type="button" name="equal" class="red" value=" = " onClick="EqualButton(); return false;"></td> </tr> </table> </td></tr> </table> </td></tr> </table> </td></tr> </table> </form> </center>