my javascript variables wont add correctly

Question

im having a problem adding these variables lets say 'pce'=100 and 'epbcac'=200 my result is 100200 instead of 300 what am i doing wrong thanks,

var pce = $('#pce').val();
var epbcac=$('#epbcac').val();

var results12 = pce + epbcac;

$('#tc').val(results12);

score 4 · Accepted Answer · edited Jun 20 '20 at 09:12

4

You are adding strings. You need to make them ints parseInt(string, radix).

var results12 = parseInt(pce,10) + parseInt(epbcac,10);

As @Joe mentioned radix is optional, but if you dont specify it the browser could use a different radix and could cause unpredictable behavior.

Alternatively, as @DavidMcMullin suggested a Savvier way to do it is to use the unary + operator:

var results12  = +pce + + epbcac

Radix is the base of the number system. Meaning the numbers that make up the system:

Binary: radix=2
01010101

Decimal: radix=10
0123456789

Hex: radix=16
0123456789ABCDEF

edited Jun 20 '20 at 09:12

Community

answered Mar 01 '13 at 20:03

Nix

1

I would also specify the radix, parseInt(pce, 10); just in case. – Joe Mar 01 '13 at 20:05
Don't forget to specify the radix. – j08691 Mar 01 '13 at 20:05
@user2120124 actually he was first. – Ben McCormick Mar 01 '13 at 20:08
Nix was first by a few seconds actually. – Arkadiusz 'flies' Rzadkowolski Mar 01 '13 at 20:09
the unary + operator would be another option, if you feel like being more concise, although it also more cryptic... +pce + +epbcac – Frances McMullin Mar 01 '13 at 20:16
@DavidMcMullin I like it, i would post as an answer `+'200' + +'300'` – Nix Mar 01 '13 at 20:19

score 0 · Answer 2 · answered Mar 01 '13 at 20:04

0

Use parseInt(pce); and parseInt(epbcac); before summing it up.

answered Mar 01 '13 at 20:04

Have proper radix while parsing int. for example parseInt(pce, 10); – Amareswar Mar 01 '13 at 20:07

score 0 · Answer 3 · answered Mar 01 '13 at 20:07

0

As others said, use parseInt, but ideally use

parseInt(pce,10) + parseInt(epbcac,10)

otherwise strings with leading zeros in the form "012" will be parsed incorrectly as hex digits and the addition won't work correctly.

answered Mar 01 '13 at 20:07

Ben McCormick

3 Answers3