What is a Scheme expression?
A Scheme expression is a construct that returns a value, such as a variable reference, literal, procedure call, or conditional. Expression types are categorized as primitive or derived. Primitive expression types include variables and procedure calls.
What does number do in Scheme?
Scheme numbers are either exact or inexact. A number is exact if it was written as an exact constant or was derived from exact numbers using only exact operations. A number is inexact if it was written as an inexact constant, if it was derived using inexact ingredients, or if it was derived using inexact operations.
How do you define a list in Scheme?
In contrast to Scheme’s unstructured data types, such as symbols and numbers, lists are structures that contain other values as elements. A list is an ordered collection of values. In Scheme, lists can be heterogeneous, in that they may contain different kinds of values.
What is a Scheme example?
To scheme is to plot or plan to do something. An example of scheme is when you and your friend meet to talk about how you are going to get away with skipping school. A plot or secret, devious plan.
What is CDR and car in Scheme?
In Scheme, car , cdr , and cons are the most important functions. car is an acronym from the phrase Contents of the Address part of the Register; and cdr is an acronym from the phrase Contents of the Decrement part of the Register.
Is Scheme still used?
Scheme is mainly used for teaching essential ideas of programming languages nowadays. Programming languages should be designed not by piling feature on top of feature, but by removing the weaknesses and restrictions that make additional features appear necessary.
Is there modulo in Scheme?
2.7 Operations on Integer Values. See also truncate-quotient , truncate-remainder and related operations in Arithmetic. Scheme Procedure: modulo n d C Function: scm_modulo (n, d) Return the remainder from n divided by d , with the same sign as d .
What is lambda in Scheme?
Lambda is the name of a special form that generates procedures. It takes some information about the function you want to create as arguments and it returns the procedure. It’ll be easier to explain the details after you see an example. The argument is the procedure returned by lambda .)
What is the sentence of scheme?
“He has a brilliant scheme to attract customers.” “Please design a color scheme for our kitchen.” “The thieves thought up an evil scheme to steal people’s money.” “Their scheme to take over the company was exposed.”
What is the difference between scheme and schema?
As nouns the difference between scheme and schema is that scheme is a systematic plan of future action while schema is an outline or image universally applicable to a general conception, under which it is likely to be presented to the mind.
What is set cdr?
The setcdr function is similar to the setcar function, except that the function replaces the second and subsequent elements of a list rather than the first element. (To see how to change the last element of a list, look ahead to The kill-new function, which uses the nthcdr and setcdr functions.)
What can be used as a variable in scheme?
Any identifier that is not a syntactic keyword can be used as a variable. When an identifier appears as a literal or within a literal, it denotes a symbol. Scheme accepts most of the identifiers that other programming languages allow. MIT Scheme allows all of the identifiers that standard Scheme does, plus many more.
What is the syntax of scheme?
The syntax of Scheme, like that of most Lisp dialects, provides for great expressive power, largely due to its simplicity. An important consequence of this simplicity is the susceptibility of Scheme programs and data to uniform treatment by other Scheme programs.
How do you pass arguments by value in scheme?
Arguments to Scheme procedures are passed by value, which means that Scheme evaluates the argument expressions before the procedure gains control, whether or not the procedure needs the result of the evaluations. ML, C, and APL are three other languages that pass arguments by value.
Which variables are statically scoped in scheme?
Variables are statically scoped Scheme is a statically scopedprogramming language, which means that each use of a variable is associated with a lexically apparent binding of that variable. Algol is another statically scoped language.