0.1 plus 0.2 not equal 0.3

This is normal for floats, because computers can't represent all possible numbers accurately.

https://stackoverflow.com/questions/588004/is-floating-point...

Just read this:

https://docs.oracle.com/cd/E19957-01/806-3568/ncg_goldberg.h...

It's equal in Scheme. You need to use rationals.

Also, under 'Unix Calc': (0.1 + 0.2) - 0.3 yields 0.