What are the different valid prototypes of 'ma

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What are the valid signatures for C's main() function?

What are the different valid prototypes of 'main' function?

Are there some non-standard prototypes also supported only by a few vendors?

Answer 1

The full prototype allowed by gcc is:

int main(int argc, char * argv[], char *envp[])

but envp is rarely used. Omitting argc and argv is also considered acceptable.

Answer 2

The C standard (§ 5.1.2.2.1) defines two entry point prototypes:

int main(void);

or

int main(int argc, char **argv);

Other than that, every OS has its own additional non-standard entry points. WinMain, etc.