#include <iostream>
#include <iomanip>
#include <limits>

int main()
{
    const double a = 1 ;

    constexpr int max_precision = std::numeric_limits<double>::digits10 ;
    std::cout << std::fixed << std::setprecision(max_precision) ;

    std::cout << "//---------------------\n" ;
    for( int b = 1 ; b < 30 ; ++b )
    {
        const double outcome = a / b ;
        std::cout << "for b == " << std::setw(3) << b
                   << " result: " << outcome << '\n' ;
    }
}