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Is it possible to define a custom data type? Say, one that holds approximately... 10 million digits?!!

Just curious. Is this possible? Otherwise, how can I work with insanely huge integers?

I tried to follow that, but it's still not working.

New code:

int main(void)
{
unsigned long startingNumber; // THE Number. Is it prime?
unsigned long testNumber;
unsigned long answer;

Well thanks, that helps SO much.
What mistakes did I make?
(other than forgetting to convert startingNumber with atoi)

I'm still new to C. I wrote some code, but I'm sure I did something wrong because it's not giving the correct output.

(compiling and running on linux)


void main()
{
unsigned long...

No, no header file needs to be installed.

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