C++: How do I store a 256 bit number, and how do I convert it to hex?

Question

ints only go to 32 bits, longs to 64bits... so.. what do you do when you are working with a much larger number?

Also, how easy would it be to switch between the binary

Answer 1

ints only go to 32 bits, longs to 64bits... so.. what do you do when you are working with a much larger number?

You use large number libraries.

Also, how easy would it be to switch between the binary representation and the hex representation?

I don't understand the question. A number's a number's a number. Are you asking how to print a number in an certain base? You can format output when using streams like so:

int x = 100;

cout << x << endl; // print decimal value
cout << oct << x << endl; // print octal value
cout << hex << x << endl; // print hexadecimal value

100
0144
0x64