Answer Posted / nara venkata satyanarayana

First we should know whether main() belongs to C/C++ or
java. If it is in C/C++ it is "user-defined" because not
available in any header file and body defined by user, but
compiler will starts body execution from main() function
only. But in java without main() also we can execute
programs and get output eg:-using static blocks.
Here also it is "user-defined" one.

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