EXIT_FAILURE

From Cppreference

C++ Standard Library
Language Utilities library Strings library Containers library Algorithms library Iterators library Numerics library Input/output library Localizations library Regular expressions library (C++11) Atomic operations library (C++11) Thread support library (C++11)
Utilities library
Program support utilities
Program termination abort exit quick_exit (C++11) _Exit (C++11) atexit at_quick_exit (C++11) Execution outcome indicators EXIT_SUCCESS EXIT_FAILURE Communicating with the environment system getenv Signals signal raise Signal handling strategies SIG_DFL SIG_IGN SIG_ERR Signal types SIGABRT SIGFPE SIGILL SIGINT SIGSEGV SIGTERM Non-local jumps setjmp longjmp Types jmp_buf

Defined in header <cstdlib>
#define EXIT_FAILURE /*implementation defined*/

The EXIT_FAILURE macro expands into an integral expression, indicating unsuccessful execution of a program.

[edit] See also

EXIT_SUCCESS	indicates successful program execution (macro constant)