By David Gries
Describes the innovations excited by writing compilers for high-level languages similar to FORTRAN or PL/1. Treats either idea and useful features of compiler writing. Discusses semantic workouts, their reasons and their connection to syntax attractiveness.
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As a side effect, the standard output port is connected to both the monitor and file. (transcript-off) an unspecified value. As a side effect the standard output port is disconnected from file. A file containing a Scheme session is called a transcript file. An Example Let's study a fragment of a Scheme session. Expressions entered by the user appear next to the interpreter's prompt: >, followed immediately by their values. 0 ) (>= 3 5) #f ) '(+ 2 3 4) (+ 2 3 4) ) (+ 2 3 4) 9 ) + [+J ) This session shows literals, symbols, and applications being evaluated.
Is called, this same list is returned. 3. The Abstraction Principle 43 The same problem occurs with vectors, strings, and pairs. Assume the following definitions have been made: (define x #\a) (define y #\b) (define z #\C) Now compare the following evaluations: > (vector x y z) #(#\a #\b #\c) > #(x y z) #(x y z) > (string x y z) "abc" > "xyz" "xyz" > (cons x y) (#\a • #\b) > (X '(X . 2. Selectors A selector is a procedure that returns the component of a composite value at a given position. In a sense, constructors and selectors are inverse operations.
In this section we consider records. A record (called a struct in C) represents the relevant properties of it person, place, or thing. We can represent a record as a list of associations in which ATTRmUTE is a symbol that names the attribute. For example, a student record might contain the name, social security number. and grade point average of a student: «name "picard") (ssn . 998869999) (gpa . 75») «name. "Moe") (ssn . 002869999) (gpa . 5» «name. nSpock") (ssn . 905869999) (gpa . 9» We can view student records as a new domain of composite values: STUDENT: := «name.