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

int main(int argc, char *argv[]){
	if(argc==2) {
		std::cout << std::fixed;
		float printable{std::stof(argv[1])};
		std::cout << std::setprecision(std::numeric_limits<float>::max_digits10 + 2);
		std::cout << printable << std::endl;
	} else if(argc==3) {
		std::string floatsize{argv[2]};
		if(floatsize=="f") {
			std::cout << std::fixed;
			float printable{std::stof(argv[1])};
			std::cout << std::setprecision(std::numeric_limits<float>::max_digits10 + 2);
			std::cout << printable << std::endl;
		} else if (floatsize=="d") {
			std::cout << std::fixed;
			double printable{std::stod(argv[1])};
			std::cout << std::setprecision(std::numeric_limits<double>::max_digits10 + 2);
			std::cout << printable << std::endl;
		} else if (floatsize=="ld") {
			std::cout << std::fixed;
			long double printable{std::stold(argv[1])};
			std::cout << std::setprecision(std::numeric_limits<long double>::max_digits10 + 2);
			std::cout << printable << std::endl;
		} else {
			std::cerr << "That's not a valid floatsize. The only valid sizes are: f, d and ld." << std::endl;
			return 1;
		}
	} else {
		std::cerr << "Incorrect number of arguments." << std::endl;
		return 1;
	}
	return 0;
}