Numbers, fractions and
We will start by having a look at the
simplest kinds of expressions: numbers, fractions and text. When
submitted to the Pico machine, these expressions -sometimes called
literals- are identical to their values. For
While the meaning of numbers or
fractions is obvious, the notion of text deserves some explanation.
Text is the mechanism used to introduce symbolic -as opposed
to numeric- values; any sequence of keystrokes delimited by
either apostrophes (') or quotes (") is acceptable as text.
Programmers usually have text in their programs to represent symbolic
data or to interact with the outside world using symbols whenever
numbers are not sufficient; in this case the
component strips the delimiters from the text value.