increasing variable in for loop using javascript

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hiii all,
i have for loop which i calculate balance of user (The user would has more than one balance) .
in this loop i would to add the old balance with the new value of balance , all of these in java script.

i tried to write that line:

JavaScript

Balance_Sum += balance;

But, when i displayed "Balance_Sum" variable, it appears as

"UnDefinded 100.00"

i want to know how can i disable "undefined" word and display balance correctly.

Thanks

Posted 31-Jul-11 22:32pm

moon2011

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_Zorro_ 1-Aug-11 4:34am

Please, paste the code you're using to display such message.

2 solutions

Solution 1

You need to convert balance to a number before adding it to Balance_Sum.
If you don't do that, the addition is taken as a concatenation rather than a numeric operation.

Posted 31-Jul-11 22:39pm

Abhinav S

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OriginalGriff · Accepted Answer · 2011-07-31T22:54:00

When you declare a variable it's value is set as "undefined": if you subsequently try to add a number to it, it is converted to a string "Undefined" and a string concatenation is performed.
Either, check if the variable has a value before you add to it:

JavaScript

if (balance!=undefined)
{
   ...
}

Or initialise it when you declare it:

JavaScript

var balance = 0;

increasing variable in for loop using javascript

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