jquery - Javascript - Leading zero to a number converting the number to some different number. not getting why this happening? -

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A leading zero to some number converting the number to some unknown number format. for example :

017 is getting converted to 15

037 is getting converted to 31

Also found that numbers having 8 0r 9 at end are remaining same for example :

018 is 18

038 is 38

o59 is 59

one more thing that I found is

for each next range of 10 the difference between converted value and the actual value get incremented by 2

for example :

for range 00-09 difference is 0 i.e value of 07 will be 7, 04 will be 4

for range 010-019 difference is 2 value of 017 will be 15, 013 will be 11

for range 020-029 difference is 4 value of 027 will be 23, 021 will be 17

and so on..

here is a snipet for test /

I am not getting why this is happening ?

Please help me how to get the correct decimal number from the number having leading zero ?

A leading zero to some number converting the number to some unknown number format. for example :

017 is getting converted to 15

037 is getting converted to 31

Also found that numbers having 8 0r 9 at end are remaining same for example :

018 is 18

038 is 38

o59 is 59

one more thing that I found is

for each next range of 10 the difference between converted value and the actual value get incremented by 2

for example :

for range 00-09 difference is 0 i.e value of 07 will be 7, 04 will be 4

for range 010-019 difference is 2 value of 017 will be 15, 013 will be 11

for range 020-029 difference is 4 value of 027 will be 23, 021 will be 17

and so on..

here is a snipet for test http://jsfiddle/rajubera/BxQHF/

I am not getting why this is happening ?

Please help me how to get the correct decimal number from the number having leading zero ?

• javascript
• jquery

Share Improve this question Follow edited Jul 31, 2013 at 14:53 Raju Bera asked Jul 31, 2013 at 14:26 Raju BeraRaju Bera 1,01899 silver badges1414 bronze badges 5

• 4 You're going to need to post some code so we can reproduce the issue. – Jason P Commented Jul 31, 2013 at 14:29
• Possible duplicate of Leading zero in javascript and Javascript, why treated as octal – apsillers Commented Jul 31, 2013 at 14:44
• possible duplicate of Javascript parseInt() with leading zeros – Bergi Commented Jul 31, 2013 at 14:44
• no in my case parseInt(012,10) doesn't help. you can check the jsfiddle link – Raju Bera Commented Jul 31, 2013 at 14:56
• 2 Why are you writing your numbers with leading zeros? If you want decimal values, just don't do that. If you are getting the values as string input, parseInt(string,10) will work (but you are correct that using parseInt on an octal literal will not convert it to decimal. – apsillers Commented Jul 31, 2013 at 15:05

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2 Answers 2

Sorted by: Reset to default 10

If there is a leading 0, it is converting it to octal (base 8) as long as its a valid number in base 8 (no numbers greater than 7).

For example:

017 in base 8 is 1 * 8 + 7 = 15 037 in base 8 is 3 * 8 + 7 = 31

018 is converted to 18 because 018 isn't a valid number in base 8

Note that the behavior as to which base the number is converted to by default can be browser-specific, so its important to always specify the base/radix when using parseInt:

parseInt("017",10) === 17

UPDATE based on ments:

parseInt expects a string as the first argument, so

parseInt("012",10) === 12

One of the reasons to "use strict";

(function() {"use strict"; 017})()

// Firefox => SyntaxError: "0"-prefixed octal literals and octal escape sequences are deprecated; for octal literals use the \"0o\" prefix instead 
// Chrome, Node => SyntaxError: Octal literals are not allowed in strict mode.

https://developer.mozilla/en-US/docs/Web/JavaScript/Reference/Errors/Deprecated_octal

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