What is 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 number 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.

What are symbols in Scheme?

Symbols in Scheme are widely used in three ways: as items of discrete data, as lookup keys for alists and hash tables, and to denote variable references. Looking beyond how they are written, symbols are different from strings in two important respects. The first important difference is uniqueness.

What is #f Scheme?

1 Answer. 1. 6. It’s a misuse of the cond statement; although it’s idiomatic in Common Lisp, in Scheme the equivalent and idiomatic syntax should have been: (else #f) It’s just a way to say: if all other conditions fail, then return false.

Is everything a list in Scheme?

3 Answers. No, this is a common misconception because lists are so pervasive in Scheme programming (and often functional programming in general). Most Scheme implementations come with many data types like strings, symbols, vectors, maps/tables, records, sets, bytevectors, and so on.

What is member in Scheme?

member is a function that treats a list as a set. It returns true if the item is found in the list, and false otherwise.

What type of number is I?

Are there ‘pretend’ numbers?” Well, yes, actually there are, though they’re actually called “imaginary” numbers; they are what is used to make the complex numbers, and “imaginary” is what the “i” stands for.

What is the difference between symbols and schemes?

In interpreters and compilers, symbol objects are often used as variable names, and Scheme treats them specially. If we just type in a character string that’s a symbol print name, and hit return, Scheme assumes that we are asking for the value of the binding of the variable with that name–if there is one.

What are symbols in Lisp?

Symbols are Lisp data objects that serve several purposes and have several interesting characteristics. Every object of type symbol has a name, called its print name. Given a symbol, one can obtain its name in the form of a string. Conversely, given the name of a symbol as a string, one can obtain the symbol itself.

Is everything a list in LISP?

Lisp has one: everything is a list. Lisp has built-in syntax (provided by special operators in Common Lisp) and arbitrary complex syntax provided by macros. This is valid for other languages with a notation based on s-expressions, like Scheme or Clojure.

What is CDR in Scheme?

In Scheme, car , cdr , and cons are the most important functions. The cons function is used to construct pairs and pairs are used to construct the lists. 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.

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.

When do you need exact numbers in scheme?

An implementation of Scheme must support exact integers throughout the range of numbers that may be used for indexes of lists, vectors, and strings or that may result from computing the length of a list, vector, or string.

What are the different types of scheme numbers?

It is important to distinguish between the mathematical numbers, the Scheme numbers that attempt to model them, the machine representations used to implement the Scheme numbers, and notations used to write numbers. This report uses the types number, complex, real, rational, and integerto refer to both mathematical numbers and Scheme numbers.

Which is an example of a non integer?

Well, an integer is really described as just a whole number. So, a non-integer would be anything noted as not being a whole number. An integer, for instance, would be in this set: [-3, -2, -1, 0, 1, 2, 3,…]. A non integer would be in this set: [8/3, pi, √5, and so on and so forth].

How to find list of non-negative integers with sum of N?

Given two integers M and N, the task is to create a list of M non-negative integers whose sum is N. In case when more than one list is possible, find any one. Recommended: Please try your approach on {IDE} first, before moving on to the solution.