Question

I wrote simple C++/CLI code to calculate a result of big integer numbers operation, but it failed with the warning warning C4307: '*' : integral constant overflow, here is my code:

int main(array<System::String ^> ^args)
{
    String^ number = gcnew String((wchar_t *)(28433 * (2 ^ 7830457) + 1));

    Console::WriteLine(number);
    return 0;
}

Answer 1

You have a number of fundamental misunderstandings in your code:

1. You’re not using big integers anywhere
2. ^ is xor, and not exponentiation.
3. You’re casting that integer to a pointer, which is a meaningless operation

You should use the BigInteger struct from System.Numerics. Don’t forget to add the assembly reference to System.Numerics.dll first.