Interested to Buy Any Domain ? << Click Here >> for more details...
Write a javascript program to make a simple calculator
- 11 Answers
- 71807 Views
- Anand Group, TCS, I also Faced
- E-Mail Answers
Answer Posted / anusha
<html>
<head>
<title>A simple JavaScript calculator</title>
<script language='JavaScript'>
Default = "0";
Current = "0";
Operation = 0;
MaxLength = 30;
function AddDigit(dig) {
if (Current.indexOf("!") == -1) {
if ((eval(Current) == 0) && (Current.indexOf(".") == -1)) {
Current = dig;
} else {
Current = Current + dig;
}
Current = Current.toLowerCase();
} else {
Current = "Hint! Press 'AC'";
}
if (Current.indexOf("e0") != -1) {
var epos = Current.indexOf("e");
Current = Current.substring(0,epos+1) + Current.substring(epos+2);
}
if (Current.length > MaxLength) {
Current = "Too long";
}
document.Calculator.Display.value = Current;
}
function Dot() {
if ( Current.length == 0) {
Current = "0.";
} else {
if (( Current.indexOf(".") == -1) && (Current.indexOf("e") == -1)) {
Current = Current + ".";
}
}
document.Calculator.Display.value = Current;
}
function DoExponent() {
if ( Current.indexOf("e") == -1 ) {
Current = Current + "e0";
document.Calculator.Display.value = Current;
}
}
function PlusMinus() {
if(Current.indexOf("e") != -1) {
var epos = Current.indexOf("e-");
if (epos != -1) {
Current = Current.substring(0,1+epos) + Current.substring(2+epos);
} else { epos = Current.indexOf("e");
Current = Current.substring(0,1+epos) + "-" + Current.substring(1+epos);
}
} else {
if ( Current.indexOf("-") == 0 ) {
Current = Current.substring(1);
} else {
Current = "-" + Current;
}
if ((eval(Current) == 0) && (Current.indexOf(".") == -1 )) {
Current = "0"; }
}
document.Calculator.Display.value = Current;
}
function Clear() {
Current = "0";
document.Calculator.Display.value = Current;
}
function AllClear() {
Current = "0";
Operation = 0;
Default = "0";
document.Calculator.Display.value = Current;
}
function Operate(op) {
if (Operation != 0) { Calculate(); };
if (op.indexOf("*") > -1) { Operation = 1; };
if (op.indexOf("/") > -1) { Operation = 2; };
if (op.indexOf("+") > -1) { Operation = 3; };
if (op.indexOf("-") > -1) { Operation = 4; };
Default = Current;
Current = "";
document.Calculator.Display.value = Current;
}
function Calculate() {
if (Operation == 1) { Current = eval(Default) * eval(Current); };
if (Operation == 2) {
if (eval(Current) != 0) {
Current = eval(Default) / eval(Current)
} else {
Current = "Divide by zero";
}
}
if (Operation == 3) { Current = eval(Default) + eval(Current); };
if (Operation == 4) { Current = eval(Default) - eval(Current); };
Operation = 0;
Default = "0";
Current = Current + "";
if (Current.indexOf("Infinity") != -1) {
Current = "Value too big";
}
if (Current.indexOf("NaN") != -1) {
Current = "I don't understand";
}
document.Calculator.Display.value = Current;
}
function FixCurrent() {
Current = document.Calculator.Display.value;
Current = "" + parseFloat(Current);
if (Current.indexOf("NaN") != -1) {
Current = "I don't understand";
}
document.Calculator.Display.value = Current;
}
</script>
</head>
<hr><div align="center">
<FORM name="Calculator">
<table width="40%" height="40%" border="4" bgcolor="#FFEBCD"><tr>
<td colspan="2" align="center">
<b><font face="Verdana, Arial, Helvetica" color="#000080" size="3">
A Simple JavaScript Calculator<br></font>
<font face="Courier" size="5">
<input type="text" maxlength="40" size="25" name="Display" onChange="FixCurrent()">
</font></b>
</td></tr>
<tr><td width="65%" align="center">
<table><tr>
<td><input type="button" name="seven" value=" 7 " OnClick="AddDigit('7')"></td>
<td><input type="button" name="eight" value=" 8 " OnClick="AddDigit('8')"></td>
<td><input type="button" name="nine" value=" 9 " OnClick="AddDigit('9')"></td>
</tr><tr>
<td><input type="button" name="four" value=" 4 " OnClick="AddDigit('4')"></td>
<td><input type="button" name="five" value=" 5 " OnClick="AddDigit('5')"></td>
<td><input type="button" name="six" value=" 6 " OnClick="AddDigit('6')"></td>
</tr><tr>
<td><input type="button" name="one" value=" 1 " OnClick="AddDigit('1')"></td>
<td><input type="button" name="two" value=" 2 " OnClick="AddDigit('2')"></td>
<td><input type="button" name="three" value=" 3 " OnClick="AddDigit('3')"></td>
</tr><tr>
<td><input type="button" name="plusmin" value=" +/- " OnClick="PlusMinus()"></td>
<td><input type="button" name="one" value=" 0 " OnClick="AddDigit('0')"></td>
<td><input type="button" name="two" value=" . " OnClick="Dot()"></td>
</tr>
</table>
</td>
<td width="35%" align="center">
<table><tr>
<td><input type="button" name="clear" value=" C " OnClick="Clear()"></td>
<td><input type="button" name="AC" value=" AC " OnClick="AllClear()"></td>
</tr><tr>
<td><input type="button" name="mul" value=" * " OnClick="Operate('*')"></td>
<td><input type="button" name="div" value=" / " OnClick="Operate('/')"></td>
</tr><tr>
<td><input type="button" name="add" value=" + " OnClick="Operate('+')"></td>
<td><input type="button" name="sub" value=" - " OnClick="Operate('-')"></td>
</tr><tr>
<td><input type="button" name="result" value=" = " OnClick="Calculate()"></td>
<td align="right"><input type="button" name="exp" value=" EXP " OnClick="DoExponent()"></td>
</tr></table>
</td>
</tr></table>
</div></body>
</html>
| Is This Answer Correct ? | 68 Yes | 26 No |
Post New Answer View All Answers
What is the role of break and continue statements?
What are the advantages of using external javascript?
What is decodeuri(), encodeuri() in javascript?
How to make elements invisible?
What is primitive data type in javascript?
Is javascript object a hash table?
Explain the process of document loading.
How fast can you learn coding?
What are ‘settimeout()’?
Define unescape() and escape() functions?
How to access the value of a textbox using javascript?
What can be the challenges during testing a program or a system?
Is javascript becoming obsolete?
What are the seven data types of javascript?
Define closure.
