Question

2 parts of evaluation (dynamic semantics) of let definition let x = e

Answer 1

Dynamic semantics evaluation of let definition involves static scoping and runtime binding.

Step-by-step explanation:

Dynamic semantics evaluation of the let definition let x = e involves two parts: static scoping and runtime binding.

1. Static scoping: Determines the scope of the variable x at compile time. It refers to the region of the program where the variable can be accessed.
2. Runtime binding: Associates the variable x with a value at runtime when the let expression is executed. It provides the value of e which is assigned to the variable x in the program.

For example, consider the code snippet:

let x = 5 in x + 2

In this case, static scoping ensures that x is accessible only within the scope of the let expression, and runtime binding assigns the value 5 to x when the expression is evaluated, resulting in the output 7.