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ANSI C89:

2.1.2.2 Hosted environment

A hosted environment need not be provided, but shall conform to the
following specifications if present.

"Program startup"

The function called at program startup is named main . The
implementation declares no prototype for this function. It can be
defined with no parameters:

int main(void) { /*...*/ }

or with two parameters (referred to here as argc and argv , though any
names may be used, as they are local to the function in which they are
declared):

int main(int argc, char *argv[]) { /*...*/ }


If they are defined, the parameters to the main function shall obey
the following constraints:



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