Adding numbers larger than long long in C++

Question

I want to add two numbers which is the largest values that a long long integer can hold; and print it. If I don\'t store the value of sum in a variable, I just print it usin

Answer 1

If you don't want to overflow, then you need to use a "long integer" library, such as Boost.Multiprecision. You can then perform arbitrary-long integer/f.p. operations, such as

#include 
#include 

#include 

int main()
{
   using namespace boost::multiprecision;

   cpp_int i; // multi-precision integer 

   i = std::numeric_limits::max();

   std::cout << "Max long long: " << i << std::endl; 
   std::cout << "Sum: " << i + i << std::endl;
}

In particular, Boost.Multiprecision is extremely easy to use and integrates "naturally" with C++ streams, allowing you to treat the type almost like a built-in one.