Numbers in GNU fussy are represented as floating point numbers and can be specified with or without the decimal point, or in the exponent format. Optionally, an error can also be associated with the numbers via the pm directive. E.g., 75.3 +/- 10.1 can be expressed as 75.3pm10.1. Numbers can also be tagged with units (see Section Units) or a C-styled printing format (see Section Formatting).