Is main function in c++ user defined or built in?

szak1592 (22)
I need expert advice on this one, you know some say that main is user defined as we define the body (that is my opinion too) but others say that is predefined/built-in as the name can not be changed and the declaration is built in! So which of these concepts is correct, you know I had a test today and I was asked this question and I said that it is user defined, now please tell me the correct answer?
Thanks.
closed account (1vRz3TCk)
It is user defined, there is no 'default' version provided by the tool chain.

The Standard wrote:
An implementation shall not predefine the main function.
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