What does the leading zero means?

Question

I realized this while using the Chrome Devtools.

100 + 2 // outputs 102
0100 + 2 // outputs 66
01001 + 6 // outputs 519
060 + 3 // outputs 51
024 + 9 // outputs 29

Anyone can explain what is going on?

if you start the number with zero that means the number is octal, read here about octal system http://en.wikipedia.org/wiki/Octal — Cristian Olaru, Feb 05 '15 at 19:38

score 1 · Answer 1 · answered Feb 05 '15 at 19:35

1

The leading zero indicates that the number literal is in octal, that is, base 8.

answered Feb 05 '15 at 19:35

MatthewG

score 0 · Answer 2 · answered Feb 05 '15 at 19:35

0

0 starts an octal literal, not a decimal.

answered Feb 05 '15 at 19:35

Esailija

2 Answers2