EXIT_SUCCESS, EXIT_FAILURE
From cppreference.com
                    
                                        
                    
                    
                                                            
                    | Defined in header <stdlib.h>
  | ||
| #define EXIT_SUCCESS /*implementation defined*/ | ||
| #define EXIT_FAILURE /*implementation defined*/ | ||
The EXIT_SUCCESS and EXIT_FAILURE macros expand into an integral expression and indicate program execution status.
| Constant | Explanation | 
| EXIT_SUCCESS | successful execution of a program | 
| EXIT_FAILURE | unsuccessful execution of a program | 
[edit] See also
| C++ documentation for EXIT_SUCCESS, EXIT_FAILURE | 

