Exit Codes from system() not as expected

Question

The system() function seems to be returning 128 times the exit code I get from the process it\'s evoking.

From the man page:

RETURN VALUE

Answer 1

0 and 512 are the termination status of the command.

If the command executes successfully, it returns a 0 value, otherwise, it returns a non-zero value. And this non-zero value is various in different OSs. In my mac os, the return value of the second system command is 256.

You can also get answer from this question `ls` exit status.