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Why the function name main() is retained in many languages like C, C++, Java? Why not any other names for that function? Is there any common structure for all these 3 main() (in C, C++, Java)
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In Python, the special name __main__ is used for two important constructs: the name of the top-level environment of the program, which can be checked using the __name__ == '__main__' expression; and. the __main__.py file in Python packages.
if __name__ == “main”: is used to execute some code only if the file was run directly, and not imported.
The Reason Behind if __name__ == '__main__' in Python You might have seen this one before: the syntax which often gets ignored because it doesn't seem to hinder the execution of your code. It may not seem necessary, but that's only if you're working with a single Python file.
Some programming languages have a special function called main() which is the execution point for a program file. Python interpreter, however, runs each line serially from the top of the file and has no explicit main() function.
There are a lot of silly and not very respectful answers here to a legitimate question.
C didn't come from nowhere. Its immediate ancestor is B, written by Ken Thompson. Here is a link to the B manual. The basic structure of a B program is
main(); exit();
main() is provided by the programmer and exit() is supplied by the library. This seems to be the first appearance of main() as the predecessor of B, BCPL, has no such concept. I guess you would have to ask Ken Thompson why it was main and not something else.
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