Is `int main(const unsigned int, const char* const* argv);` a Valid Signature for C \'s Main Function?

Validity of Specialized Argument Qualifiers for C 's Main Function

The standard defines two valid signatures for the main function:

<code class="cpp">int main();
int main(int, char*[]);</code>

This article examines whether the following signature would be legally accepted:

<code class="cpp">int main(const unsigned int, const char* const* argv);</code>

Overloading Consideration

The question arises whether modifying the argument types to include unsigned and const qualifiers alters the identity of main, thereby violating the standard's prohibition of overloading.

Standard Interpretation

The C 98 standard states that main:

• Shall have a return type of int.
• Shall not be overloaded.
• Allows both of the provided signatures.
• Implementation defines its other parameter types.

Compiler Availability

While the standard does not require implementations to accept environments accepting this specialized main signature, it permits them to do so.

Conclusion

Therefore, the modified signature, int main(const unsigned int, const char* const* argv), is considered a valid variation of main by conforming compilers, demonstrating the flexibility of the standard in accommodating implementation-specific aspects of its implementation.

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