why we need to pass an argument in an exit command?

Question

exit(1);

Answer 1

whenever we quit an application it returns a value . 0 means program runs ok any other no means program has error.

so exit command has a parameter as integer

Answer 2

sorry sir I could not understand . Can u explain again

Answer 3

when any program exited it returns a value.

this value is called exit status.

https://en.m.wikipedia.org/wiki/Exit_status

if it returns 0 it means the program works properly without any error.

exit method exit you application with returning the parameter on it.

ex
exit(0);
means the exit status is 0.

if exit (1);
means the exit status is 1

Answer 4

The exit argument will give you the indication of the exit state

eg:
-1 = ERROR
1 = OK