rules.
interface static
Primitive type representing a 64-bit IEEE floating point number.
Floats can be compared using the ==, !=,
>, <, >= and
<= operators.
Floats support the arithmetic operators +, -,
/, *, and %.
Floats can be negated using the - prefix.
String and integer values can be converted to float values using the
float() function:
float("2.2") == 2.2
float(2) == 2.0