Add float type and test cases for float and double types.

[grind0x]

Implementing float type is required
And proper test cases for float and double type is needed.

[nadongguri]

Those type have been already processed by @gogag2, in this issue.
As of now, float is not implemented actually but do we need additional patches for the double implementation?
Also, that table is required to update. :)

[grind0x]

I will create a test case that compares precision between double and float.
and there is only one test case for doubleand which is a weak case.