error in int

[Pter0dactyl]

when I initialize an integer as i=0123; it creates an error while execution in Dev C++.but if I write it as i=123,Its not an error.Any idea why it happens.

[keskiverto]

Could be octal:
http://www.cplusplus.com/doc/tutorial/constants/

[Pter0dactyl]

thanx for the answer.