#include <iostream>
#include <iomanip>

void f(double m, double x, double b)
{
	double r = m * x + b;
	std::cout << "m = " << m << '\n';
	std::cout << "x = " << x << '\n';
	std::cout << "b = " << b << '\n';
	std::cout << "r = " << r << '\n' << '\n';
}

int main()
{
    std::cout << std::scientific;
	f(0.5, -2.0000000000000062, 1);
	std::cout << std::setprecision(53);
	f(0.5, -2.0000000000000062, 1);
}