C/C++ floating point issue

I am struggling with a basic floating-point precision issue. Here is the problem:

double d = 0.1;
d += 0.1;

d += 0.1;

d == 0.3 ? std::cout << "yes" : std::cout << "no";

Run the code and you get "no"

I understand that C/C++ store values in binary and that binary storage can not exactly store every value. I also understand that these small errors compound as you do various math operations on them (i.e. d += 0.1;).

My questions is if I do need to test if d == 0.3 (to a reasonable precision.. as is the clear intent of code above)... how do I do that? I hope the answer is not:

if (d > 0.2999 && d < 0.3001) ...

ALSO.. this works

float f = 0.1;
f += 0.1;
f += 0.1;


f == 0.3f ? std::cout << "yes" : std::cout << "no";

but I can find no equivalent "0.3d" in the language.

Thanks