Strange results in floating point

6.0 / 3.0 != 2.0 is an incorrect example because floats can represent all three numbers perfectly, so the result is equal. 9.0 / 0.3 != 30.0 is a better example, it produces the correct result in double precision but not in single precision.

Author: oscaaaaaaar

Language/Variables/Data Types/float.adoc

@@ -67,7 +67,7 @@ If doing math with floats, you need to add a decimal point, otherwise it will be
 
 The float data type has only 6-7 decimal digits of precision. That means the total number of digits, not the number to the right of the decimal point. Unlike other platforms, where you can get more precision by using a double (e.g. up to 15 digits), on the Arduino, double is the same size as float.
 
-Floating point numbers are not exact, and may yield strange results when compared. For example 6.0 / 3.0 may not equal 2.0. You should instead check that the absolute value of the difference between the numbers is less than some small number.
+Floating point numbers are not exact, and may yield strange results when compared. For example 9.0 / 0.3 may not quite equal 30.0. You should instead check that the absolute value of the difference between the numbers is less than some small number.
 
 Conversion from floating point to integer math results in truncation:
 [source,arduino]