S-attributed definition: An S-attributed definition is a formal statement about the structure of a program or module in a programming language. This definit...
S-attributed definition: An S-attributed definition is a formal statement about the structure of a program or module in a programming language. This definition uses symbols like S, L, E, and K to represent different parts of the program, and it specifies how these parts are interconnected. For example, the following S-attributed definition defines the type of a variable named x as an integer:
S
variable x : INT
L-attributed definition: An L-attributed definition is another formal statement about the structure of a program or module in a programming language. This definition uses logical operators like and, or, not, and to specify how different parts of the program are related. For example, the following L-attributed definition defines a function named add that takes two integers as arguments and returns an integer:
L
function add (a: INT, b: INT): INT
Examples:
Here are some examples of S-attributed and L-attributed definitions:
S-attributed definition:
S
function print (x: INT, y: INT): VOID
L-attributed definition:
L
if (x > 10) and (y >= 0) then
By understanding these concepts, students can write formal definitions that accurately capture the structure of programs and modules in a programming language