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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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