Javascript Multiplication Calculator
Question
Javascript beginner here. I've created a simple multiplication calculator. However I need Number 2 to increase Number 1 by a percent. Any assistance would be great.
Current setup: 100 x 7 = 700
Needs to be: 100 x(increased) by 7(%) = 107
<html>
<head>
<title>JS Calculator</title>
<script language="javascript" type="text/javascript">
function multiply(){
a=Number(document.calculator.number1.value);
b=Number(document.calculator.number2.value);
c=a*b;
document.calculator.total.value=c;
}
</script>
</head>
<body>
<form name="calculator">
Number 1: <input type="text" name="number1"><br>
Number 2: <input type="text" name="number2"> <br>
Get Result: <input type="text" name="total"> <br>
<input type="button" value="Multiply" onclick="javascript:multiply();">
</form>
</body>
</html>
3 answers
solution1
3 ACCPTED 2013-10-14 20:32:11
I believe what you want is:
c = a * (1 + (b/100.0))
To follow your example, this will give you 100 increased by 7% (100 * 1.07 = 107)
solution2
1 2013-10-14 20:26:17
7% = 0.07 or 7/100.
value * (7 / 100.0);
or
value * 0.07;
Note that you should use 100.0 (or 7.0) so that the final number is not rounded.
In your example, I think you want:
c = a + (a * (b / 100.0));
solution3
0 2013-10-14 20:30:10
<script language="javascript" type="text/javascript">
function multiply(){
a=Number(document.calculator.number1.value);
b=Number(document.calculator.number2.value);
d = b / 100
c = a * d;
document.calculator.total.value=c;
}
</script>
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