'unsigned long long' can solve upto 15 digits.
Is there a way to find square-root of a 100 digit number ?
You could also use Boost.Multiprecision library. This library provides wrappers for some popular multiprecision implementations.
#include <iostream>
#include <string>
#include <utility>
#include <boost/multiprecision/mpfr.hpp>
int main()
{
std::string s(100, '0');
s.at(0) = '1';
boost::multiprecision::mpfr_float_100 f(std::move(s));
boost::multiprecision::mpfr_float_100 sqrt = boost::multiprecision::sqrt(f);
std::cout << sqrt.str() << std::endl;
return 0;
}
Definitely. One easy way would be to use the GNU multi-precision library's mpz_sqrt() function.
This question isnt really related to C++, but here is a list of methods you can use http://en.wikipedia.org/wiki/Methods_of_computing_square_roots
Depending on if its homework or not you might be able to use a premade lib to handle bignums
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