what is the difference between exit(1) & exit (-1) ?

[zakarya]

what is the difference between exit(1) & exit (-1) ?

[weaknessforcats]

The exit() library function has only two possible returns: success (typically 0) and failure (typically 1).

Any other return values are non-standard and depend upon a particular implementation of the OS.

Avoid all hard-ced values in your code. You should be using :

exit(EXIT_SUCCESS);

or

exit(EXIT_FAILURE);