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EXIT_SUCCESS, EXIT_FAILURE

From cppreference.com
< cpp‎ | utility‎ | program
Defined in header <cstdlib>
#define EXIT_SUCCESS /*implementation defined*/
#define EXIT_FAILURE /*implementation defined*/

The EXIT_SUCCESS and EXIT_FAILURE macros expand into integral expressions that can be used as arguments to the std::exit function (and, therefore, as the values to return from the main function), 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