#include <iostream>
#include <limits>

int main()
{
    float x = std::numeric_limits<float>().min(); // x = 1.17549e-38
    float y = 1.17549e-39f; // I created a variable that is less than min float value. How is it possible?

    if(x < y)
        std::cout << "x < y" << std::endl;
    else if (x == y)
        std::cout << "x == y" << std::endl;
    else
        std::cout << "y < x" << std::endl;
   
    std::cout << x << std::endl; // x = 1.17549e-38
    std::cout << y << std::endl; // y = 1.17549e-39. No errors, no warnings.

    return 0;
}

When I tried to:

float y = 1.17549e-46f;

I got the warning: floating constant truncated to zero