#include <cstdlib>
#include <cmath>
#include <iostream>

constexpr float a = -3.14f;
constexpr float b = 3.14f;
constexpr float s = 0.1f;
constexpr int n = std::round(std::abs(a - b) / s);

auto main() -> int
{
	std::cout.precision(15);

    for (int i = 0; i < n; ++i)
    {
        float t = static_cast<float>(i) / static_cast<float>(n - 1);
        std::cout << i << ": " << (1.0f - t) * a + t * b << "\n";
    }
}