Editing MAD (programming language) (section)

=== Data types ===
MAD uses the term "mode" for its data types. Five basic modes are supported:
* '''Integer''' written with or without a scale factor ({{tt|1, +1, -1, 1K10, 1K}}) or as octal constants (to {{tt|7777777777777K}});
* '''Floating Point''' written with or without an exponent ({{tt|0., 1.5, -0.05, +100.4, -4., .05E-2, -.05E2, 5E02, 5.E2}});
*'''Boolean''' ({{tt|1B}} for true and {{tt|0B}} for false);
* '''Statement Label''', and
* '''Function Name''' written as a name followed by a period ({{tt|SQRT.}}).

The mode of a constant can be redefined by adding the character M followed by a single digit at the end of the constant, where 0 indicates floating point, 1 integer, 2 boolean, 3 function name, and 4 statement label.

For GOM six additional modes are added: {{tt|CHARACTER, SHORT INTEGER, BYTE INTEGER, LONG INTEGER, POINTER}}, and {{tt|DYNAMIC RECORD}}.

Alphabetic or character constants are stored as integers and written using the dollar sign as a delimiter ({{tt|$ABCDEF$}}) with double dollar-signs used to enter a true dollar sign ({{tt|$$$.56$}} is 56 cents). Strings longer than six characters are represented using arrays.