When the variable is declared, the number of bytes of data in memory has been determined. For example, in the compiler of vc6.0, int is four bytes, float is four bytes and doble is eight bytes. It is impossible to make the value of a variable exceed the default value.

The factorial of 17 can be solved on a scientific computer. But personal computers can't seem to handle so many numbers. A 32-bit computer can only run 2 32 at most. I don't understand a 64-bit computer, because I'm still using the software before 32-bit, and I don't know if I can run to 2 64 in the vs20 13 environment.

You can build a large integer system through arrays. We have a course to complete a large integer system through arrays.