Racket Homework Help
The racket is a functional language with a dialect of Lisp and Scheme. It is highly rated in rapid prototyping and exploration of ideas. To be an excellent programmer in Racket, you must have experience with imperative languages such as C
, Java, and Python
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To work with Racket, you must first install the engine on your computer. You can write Racket programs in your favorite editor and run them from the script or command line. However, in this tutorial
, we are going to use the DrRacket application from the Racket distribution. If you do not have this tool in your system, you can visit Racket’s official website, https://racket-lang.org/, and download it from there. If this is too much of a hassle for you, you can opt for our Racket programming homework help. Our programmers will exceptionally handle your task.
DrRacket will display a window divided horizontally into two text areas when you start it for the first time. These two areas are definitions and interactions. You will need to tell DrRacket the language you want to use because Racket is a family of languages. To bring up the language-choice dialog, use the choose language menu item in the languages menu. Then, click on the first radio button that is labeled "The Racket Language." You should be able to see the following line at the top of the definitions window: #lang racket. Your choice will be remembered by DrRacket. This line should remain the first line in all your Racket programs while working with this document.
You can use the standard file-save and file-open dialogs to save and recall the programs written in the Definitions window. Either window (Definitions and Interactions) may be temporarily hidden. This happens because one of the two windows expands to fill the space. It is also worth mentioning that DrRacket allows multiple tabs per window and multiple windows.
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1. Programs, Expressions, and Values
Programs in imperative programming languages compute by repeatedly modifying or mutating the values of variables. This is quite different in functional programming languages, where the focus is more on the application of functions (procedures) to values that have already been computed to create new values. In Racket, the mutation is permitted but it is de-emphasized.
A Racket program is made up of a series of expressions and definitions. Each of the expressions will be evaluated in order when one runs the program. The resulting values are printed in the interactions window. An interactive prompt (>), which lets one enter more expressions and have them evaluated is repeatedly offered in the interactions window. The REPL (Read-Evaluate-Print-Loop) is a popular feature of interpreters used in functional programming languages. In Racket, the simplest expressions are values. Also, this programming language supports the exact representation of rational numbers and unbounded integers as well as complex numbers. For example, 3.14159 which is an approximation of pi is equivalent to a double-precision floating-point number.
Besides inexact numbers being generated when an exact rational representation is impossible, they are quite useful when too many digits are kept by exact computations. The application of a predefined function to several arguments can also be an expression (The one provided by the Racket programming language). To construct such an application, write an open parenthesis followed by the name of the function, then the argument expressions separated by spaces, and finally close the parenthesis. Hire our Racket homework to help professionals for top-class help with homework related to programs, expressions, and values.
Binding a name to a value (sometimes specified by an expression) is one form of definition. This name can be used in subsequent expressions. However, this binding cannot be changed in the absence of mutation. The other form of definition is creating user-defined functions. You should put in parenthesis the name of the function along with the names of its parameters. This is followed by a single body expression representing the computation. A user-defined function is applied the same way a user-defined function is applied. Pay for racket homework here and get to impress your professor with unique solutions on time.
Function definitions allow multiple body expressions. However, all but the last one is evaluated and the values discarded. Multiple body expressions are not useful in the absence of side effects. A good number of imperative languages are statically typed. This means that we can infer the type of any expression in the program. This process usually involves adding explicit type annotations to parameters, variables, and functions. Racket on the other hand is dynamically typed. Run-time computed values each have a type. In general, arguments of different types may be involved in two applications of the same function. This may also produce values of different types even at the same point in a program.
It is possible to intersperse definitions and expressions in a Racket program. An evaluated expression may use any or all of the definitions appearing above it in the program. For example, function f’s body expression may use functions defined below as long as those definitions precede the application of in the expression to be evaluated.
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3. Conditional Expressions
The = function can be used to test for the equality of numbers. It consumes two or more numeric arguments and produces #t if the numbers are all equal and #f if otherwise. Boolean can be used for a more readable name, true is bound to #t while false is bound to #f. We can apply the more general equality-testing function, equal? To any two racket values. Remember that by convention, functions that produce Boolean values usually have names that end with a question mark. Also, the function not can be used to map #t to #f and vice-versa.
There are three subexpressions in an if expression. If you want to evaluate an if expression, you have to evaluate the first subexpression. If the results obtained are false, then evaluate the third subexpression. Additionally, this third subexpression becomes the value of the if expression. Otherwise, you should evaluate the second subexpression.
Note that it is not a must that the test subexpression produces a Boolean value, though it typically does. It is a form and not a function. As a result, not all of its arguments are evaluated. The if statement in an imperative language differs in several ways from if the expression in Racket. We have outlined some of the differences below.
Racket’s if the expression has the following features:
· It has a value
· It must have both the second and third subexpressions
· Typically not nested. Instead, the more general and readable cond expression can be used
A cond expression consists of:
· Several question-answer pairs of expression
· Square brackets
One has to evaluate the question expressions in order until the false is not returned. At this point, the corresponding answer expression is evaluated. The resulting value becomes the value of the cond expression. Also, note that the last question can be an else expression where the corresponding answer is evaluated.
Square brackets are used in cond expressions purely for readability purposes. In racket programming, we can replace a pair of parentheses with square brackets without interfering with the program. The vice-versa is also true. Our help with racket homework service providers is acquainted with how cond expressions work. Do not hesitate to seek our assistance whenever you are struggling with your homework.
Moreover, we can also construct more complex tests using "and" and "or." In an "and" expression, all the arguments are evaluated in order until one with the value false is found. In such a case, the whole expression evaluates to false. The expression will evaluate the value of the last argument if a false argument is not found. "Or" expressions also work similarly. However, if there is no false value, it will produce the first non-false value.
This article only contains some of the basic concepts in Racket programming. We have left out quite a lot because of space. Programminghomeworkhelp.com
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