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Calculators >>> 5 Functions.

Here is a really simple JavaScript calculator - with just 5 functions! (Add, subtract, multiply, divide, and power) This example can help you see how JavaScript evaluates math functions! Check it out!

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Add the below code to the <body> section of your page:

<script language="javascript" type="text/javascript">
/* Visit http://www.yaldex.com/ for full source code
and get more free JavaScript, CSS and DHTML scripts! */
<!-- Begin
function a_plus_b(form) {
a=eval(form.a.value)
b=eval(form.b.value)
c=a+b
form.ans.value = c
}
function a_minus_b(form) {
a=eval(form.a.value)
b=eval(form.b.value)
c=a-b
form.ans.value=c
}
function a_times_b(form) {
a=eval(form.a.value)
b=eval(form.b.value)
c=a*b
form.ans.value=c
}
function a_div_b(form) {
a=eval(form.a.value)
b=eval(form.b.value)
c=a/b
form.ans.value = c
}
function a_pow_b(form) {
a=eval(form.a.value)
b=eval(form.b.value)
c=Math.pow(a, b)
form.ans.value = c
}
// End -->
</script>
<center>
<FORM name="formx"><input type=text size=4 value=12 name="a">
<input type="button" value="  +  " onClick="a_plus_b(this.form)"> 
<input type="button" value="  -  " onClick="a_minus_b(this.form)"> 
<input type="button" value="  x  " onClick="a_times_b(this.form)"> 
<input type="button" value="  /  " onClick="a_div_b(this.form)"> 
<input type="button" value="  ^  " onClick="a_pow_b(this.form)"> 
<input type="number" size=4 value=3 name="b"> = <input type "number" value=0 name="ans" size=9>
</FORM>
</center>

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