In ISO C, you can define main either to take no arguments, or to take two arguments that represent the command line arguments to the program, like this:
int main (int argc, char *argv[])
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Other platform-dependent formats are also allowed by the C and C++ standards; for example, Unix (though not POSIX.1) and Microsoft Visual C++ have a third argument giving the program’s environment, otherwise accessible through getenv in stdlib.h:
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