I\'m needing to create an HTML/Javascript page for something that I can\'t quite
ID: 3546040 • Letter: I
Question
I'm needing to create an HTML/Javascript page for something that I can't quite wrap my head around. Here's what I have to do:
With Javascript, I have to create four buttons. However, here's what they have to do.....
- the FIRST buton will print out (at the bottom of the page) all of the results (one after the other, in one column) for "4n+3".
When I say "all of the results", I mean (for example) the first line will read" For n=1, 4n+3=..", and the result. The next will be n=2, and so on, for results for n being 1 thru 9.
The calculations HAVE to use for, while, or do-while loops. No exceptions. (ugh)
- the SECOND button will share the same format as the first, except its equation is 10-2n.
- the THIRD button will also share the same format, with its equation being n^2-2.
- the FOURTH (and final) button will have a modified geometric sequence for ar^n, when a=3 and r=2.
Like I said, I can't quite get the grasp of these equations while having to use the loops. Can you help?
Explanation / Answer
TRY THIS ////
<html>
<head>
<script type="text/javascript">
function countClicks1()
{
document.getElementById("demo").innerHTML = "" ;
for(var n = 1 ; n < 10 ;n++)
{
count = 4*n + 3 ;
document.getElementById("demo").innerHTML += "n="+n+", 4*n + 3 =" +count+"<br>" ;
}
}
function countClicks2()
{
document.getElementById("demo").innerHTML = "" ;
for(var n = 1 ; n < 10 ;n++)
{
count = 10-2*n ;
document.getElementById("demo").innerHTML += "n="+n+", 10-2*n =" +count+"<br>" ;
}
}
function countClicks3()
{
document.getElementById("demo").innerHTML = "" ;
for(var n = 1 ; n < 10 ;n++)
{
count = n*n -2 ;
document.getElementById("demo").innerHTML += "n="+n+", n*n -2 =" +count+"<br>" ;
}
}
function countClicks4()
{
document.getElementById("demo").innerHTML = "" ;
var a=3 ; var r=2 ;
for(var n = 1 ; n < 10 ;n++)
{
count = a*(Math.pow(r,n)) ;
document.getElementById("demo").innerHTML += "a="+a+",r="+r+",n="+n+", a*r^n =" +count+"<br>" ;
}
}
</script>
</head>
<body>
<div align="center">
<button type="button" >4n+3 </button>
<button type="button" >10-2n</button>
<button type="button" >n^2-2</button>
<button type="button" >ar^n</button>
</div>
<h1>
<p id="demo" align="center"></p>
</h1>
</body>
</html>
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