14.1
When I set a `float` variable to 3.1,
why is `printf` printing it as 3.0999999?

14.2
Why is `sqrt(144.)` giving me
crazy numbers?

14.3 I keep getting ``undefined: sin'' compilation errors.

14.5 What's a good way to check for ``close enough'' floating-point equality?

14.7 Where is C's exponentiation operator?

14.8
The pre-`#define`d constant `M_PI`
seems to be missing from
`<math.h>`.

14.9 How do I test for IEEE NaN and other special values?

14.11 What's a good way to implement complex numbers in C?

14.12 I'm looking for some mathematical library code.