How Should I End Code Execution in C ?

End of Code Execution in C

When a certain condition requires the termination of a C code during execution, several options are available.

Return from main:

This is the preferred method, allowing the caller of the program to determine whether the operation was successful based on the return status.

Throw and Catch an Exception:

Throwing an exception can also terminate the code execution, provided it is caught and handled in main. The caught exception can trigger an appropriate exit status return.

Using std::exit (Not Recommended):

Using std::exit is strongly discouraged as it does not perform necessary cleanup of objects on the stack, potentially leading to memory leaks and other problems. Consider other options instead.

Other Alternatives (Also Not Recommended):

• std::_Exit: Terminates the program with no cleanup.
• std::quick_exit: Terminates the program and calls registered std::at_quick_exit handlers, but no other cleanup occurs.
• std::abort: Causes an abnormal program termination with no cleanup. This should only be used in extreme circumstances.

Stack Unwinding:

In case of unhandled exceptions or stack unwinding situations, the stack is unwound, and all objects on the stack are destructed, ensuring proper cleanup.

Guidelines:

• Avoid std::exit and other dangerous alternatives.
• Use the return from main whenever possible.
• Consider throwing and catching an exception if returning from main is difficult.
• Understand the implications of stack unwinding and ensure cleanup is performed properly.

The above is the detailed content of How Should I End Code Execution in C ?. For more information, please follow other related articles on the PHP Chinese website!