The exit() method exits the current program by terminating the running Dart VM. This method takes a status code. A non-zero value of status code is generally used to indicate abnormal termination. This is a similar exit in C/C++, Java. This method doesn't wait for any asynchronous operations to terminate.
Syntax:
exit(exit_code);
To use this method, we have to import 'dart:io' package. The handling of exit codes is platform-specific.
- On Linux and OS, an exit code for normal termination will always be in the range of 0 to 255. If an exit code outside this range is set the actual exit code will be the lower 8 bits masked off and treated as an unsigned value. E.g. using an exit code of -1 will result in an actual exit code of 255 being reported.
- On Windows, the exit code can be set to any 32-bit value. However, some of these values are reserved for reporting system errors like crashes. Besides this, the Dart executable itself uses an exit code of 254 for reporting compile-time errors and an exit code of 255 for reporting runtime errors (unhandled exceptions). Due to these facts, it is recommended to only use exit codes in the range of 0 to 127 for communicating the result of running a Dart program to the surrounding environment. This will avoid any cross-platform issues.
Note: The exit(0) is generally used to indicate successful termination, while the rest generally indicates unsuccessful termination.
Using the exit() method to exit the program abruptly
Example:
Output:
Hello GeeksForGeeks
