having problems with addition!? 9

[fayna]

Hello,
I never thought someone could have problems adding two numbers, but I have them. Here's some sample code:
var op1 = "119.88"
var op1_1 = "7"
var op2 = "119.88"
var op2_2 = "4"
var res1 = parseFloat(op1) * parseInt(op1_1)
var res2 = parseFloat(op2) * parseInt(op2_2)
var result = res1 + res2
document.write(result)

The result must be 1318.68 but JavaScript returns 1318.67999999999998, where is the error?
Vars res1 and res2 are ok, the problem presents when I try to add them
Thanks

 

[gerrygerry]

I would expect it to be the use of parseFloat(). Try this:

  var op1 = 119.88;
  var op1_1 = 7;
  var op2 = 119.88;
  var op2_2 = 4;
  var res1 = op1 * op1_1;
  var res2 = op2 * op2_2;
  var result = res1 + res2;
  document.write(result)

I removed the quotes from your variable initializations and got rid of the parse___() functions. Good luck! -gerrygerry
Go To

http://quickfreewebsite.com!

 

[fayna]

Thanks for your interest gerrygerry, but the problem persits. Please help..

 

[SHARKY99]

Leave your quotes there and try this

var res1 = eval(op1 * op1_1)

It should work
Have Fun...

Sharky99 >:O>

 

[fayna]

I've tried with eval and the result is the same.

 

[fayna]

Is there any function or command for limitating the number of decimal digits?

 

[fayna]

I've found the answer: document.write(result.toFixed(2))

 

[SHARKY99]

Good...now i feel very rusty thanx hahaha ;-) Have Fun...

Sharky99 >:O>

 

[tsdragon]

I've never heard of the toFixed function before. Looks very useful! Fayna gets a star! Tracy Dryden
tracy@bydisn.com

http://www.bydisn.com

Meddle not in the affairs of dragons,
For you are crunchy, and good with mustard.

 

[alexfusion]

Hello,

I never heard too about the toFixed function.It's great.
I give fayna a star too!


alexfusion

 

[UNIMENT]

Wow! That's pretty cool! fayna gets another star.

 

[starway]

Hi guys,
Not meaning no reduce the enthusiasm, just a small comment.

[tt]toFixed[/tt] function is implemented in latest JS 1.5 ver, that means that lots of browsers doesn't "understand" it.
It is recognized by Netscape 6 (see it here:

http://developer.netscape.com/docs/manuals/js/core/jsref15/number.html),

will not be recognized by Opera (as it supports JS 1.4), not recognized by any Netscape 4. Don't know about IE - I didn't search for it's specs. (This is true for Win platform, but others - who knows...)

So I'll still use (and recommend to you) the "conventional" way of rounding numbers, which is writing a function to do this.

The idea is this: we have good old [tt]Math.round()[/tt] function that rounds to nearest highest integer.
So, in order to round 43.43625 to 2nd number after decimal point, we should do the following:
1) 43.43625 * 100
2) round the result of 1)
3) result of 2) / 100
the result is 43.44

In general, in order to round some number n to m numbers after decimal point, the algorythm is this:
( round( n * 10^m ) ) / 10^m

It is also very good because it's suitable for any programming language (that have basic round feature).
Actually, I have it ready:

function roundIt(somenumber, precision) {

result = ( Math.round (somenumber * Math.pow(10, precision) ) ) / Math.pow(10, precision);

return(result)
}

Works everywhere.
good luck.

 

[thisisnotme]

Very good.
starway gets a star
LOL LOL LOL LOL

Sorry I cant log in and give you a star starway, I might get kicked off again.