What is the precision of long double in C++?

Question

Does anyone know how to find out the precision of long double on a specific platform? I appear to be losing precision after 17 decimal digits, which is the sa

Answer 1

You can find out with std::numeric_limits:

#include      // std::cout
#include        // std::numeric_limits
int main(){
    std::cout << std::numeric_limits::digits10 << std::endl;
}