cannot do the additional operator

i got problem with additional and multiplication operator...please anyone help me

<html>
<head>
<title>Simple Calculator</title>
<script language = "JavaScript">
// calculate function
function calculate () {
//get input from first text field
var numberFirst = formCalculator.num1.value;
//get input from first text field
var operator = formCalculator.operator.value;
//get input from first text field
var numberSecond = formCalculator.num2.value;
var total; // variable declaration
var output; // variable declaration
// if else..if
if (operator == "+" )
total = numberFirst + numberSecond;
else if (operator == "-")
total = numberFirst - numberSecond;
else if (operator == " * ")
total = numberFirst * numberSecond;
else
total = numberFirst / numberSecond;
// output from pop up alert window
output = alert ( numberFirst + " " + operator + " " + numberSecond + " = " + total);
}
</script>
</head>
<body>
<p align="center" class="style1">Simple Calculator</p>
<!-- HTML form-->
<form name = "formCalculator">
<p align="center">
<!-- first text field -->
<input type="text" name="num1">
<!-- selection math operator menu -->
<select name="operator">
<option selected value="+" > +
<option value= "-" > -
<option value= "*" > *
<option value= "/" > /
</select>
<!-- second text field -->
<input type="text" name="num2">
</p>
<p align="center">
<input type="reset" name="Reset" value="Cancel">
<!-- submit button call calculate function -->
<input type="submit" name="Submit" value="Calculate" onClick= "calculate()">
</p>
</form>
</body>
</html>

View Answers

October 4, 2012 at 6:07 PM

We have modified your simple calculator program.

<html>
<head>
<title>Simple Calculator</title>
<script language = "JavaScript">
// calculate function
function calculate () {
//get input from first text field
var numberFirst = formCalculator.num1.value;
//get input from first text field
var operator = formCalculator.operator.value;
//get input from first text field
var numberSecond = formCalculator.num2.value;
var total; // variable declaration
var output; // variable declaration
// if else..if
if (operator == "+" )
total = parseInt(numberFirst) + parseInt(numberSecond);
else if (operator == "-")
total = parseInt(numberFirst) - parseInt(numberSecond);
else if (operator == " * ")
total = parseInt(numberFirst) * parseInt(numberSecond);
else
total = parseInt(numberFirst) / parseInt(numberSecond);
// output from pop up alert window
output = alert ( numberFirst + " " + operator + " " + numberSecond + " = " + total);
}
</script>
</head>
<body>
<p align="center" class="style1">Simple Calculator</p>
<!-- HTML form-->
<form name = "formCalculator">
<p align="center">
<!-- first text field -->
<input type="text" name="num1">
<!-- selection math operator menu -->
<select name="operator">
<option selected value="+" > +
<option value= "-" > -
<option value= "*" > *
<option value= "/" > /
</select>
<!-- second text field -->
<input type="text" name="num2">
</p>
<p align="center">
<input type="reset" name="Reset" value="Cancel">
<!-- submit button call calculate function -->
<input type="submit" name="Submit" value="Calculate" onClick= "calculate()">
</p>
</form>
</body>
</html>

October 4, 2012 at 10:18 PM

the additional operator already done but i still have problem with multiplication operator...when i times 1 by 2, it will get answer 0.5...

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