What is the difference between float and double in C++?

Hi! I recently started learning C++ and came across a confusing situation. The textbook says there are two types for floating-point numbers: float and double. I understand that double takes up more memory (8 bytes vs 4), but I'm not entirely clear on when to use which. For example, I wrote a simple program to calculate the area of a circle: ```cpp #include #include int main() { float radius = 2.5f; float area = M_PI * radius * radius; std::cout << "Area: " << area << std::endl; return 0; } ``` Everything works fine. But then I tried to calculate something more complex, like the sum of a large number of fractional numbers: ```cpp float sum = 0.0f; for (int i = 0; i < 1000000; ++i) { sum += 0.1f; } std::cout << "Sum: " << sum << s