What is a scheme macro?
What is a scheme macro?
A macro is a symbol that has a transformer procedure associated with it. When Scheme encounters a macro-expression — i.e., a form whose head is a macro —, it applies the macro’s transformer to the subforms in the macro-expression, and evaluates the result of the transformation.
What is macro give example?
Macro is defined as something that covers a large amount, or is large in size. An example of macro is the study of the key driving aspects of an economy; macro economics. An example of macro is a very close up photograph of an ant; a macro photograph.
What is macro expansion with example?
A macro consists of name, set of formal parameters and body of code. The use of macro name with set of actual parameters is replaced by some code generated by its body. This is called macro expansion. Example macro in C programming. Macros are commonly used in C to define small snippets of code.
What is a macro in racket?
A macro is a syntactic form with an associated transformer that expands the original form into existing forms. To put it another way, a macro is an extension to the Racket compiler. Like many languages, Racket provides pattern-based macros that make simple transformations easy to implement and reliable to use.
What is begin in scheme?
Scheme begin expressions aren’t just code blocks, though, because they are expressions that return a value. A begin returns the value of the last expression in the sequence. For example, the begin expression above returns the value returned by the call to bar . The bodies of procedures work like begin s as well.
How are macros implemented?
The trick to implementation a macro system is to tell your compiler to be lazy. Put in another way, when the compiler encounters a function, it first evaluates its formal parameter list, yields the results and passes them to the function.
How are macros useful in class 10?
Answer: Macros can make tasks less repetitive by representing a complicated sequence of keystrokes, mouse movements, commands, or other types of input. After being defined like this, our macro is used in the code body to find the square of a number.
Why macro is used in C?
In C, the macro is used to define any constant value or any variable with its value in the entire program that will be replaced by this macro name, where macro contains the set of code that will be called when the macro name is used in the program.
What are the 2 types of macro expansion?
Position Parameter Expansion.
What does macros mean in Excel?
If you have tasks in Microsoft Excel that you do repeatedly, you can record a macro to automate those tasks. A macro is an action or a set of actions that you can run as many times as you want. When you create a macro, you are recording your mouse clicks and keystrokes.
What is begin in racket?
Sequencing in The Racket Guide introduces begin and begin0. syntax. (begin form …) (begin expr …+) The first form applies when begin appears at the top level, at module level, or in an internal-definition position (before any expression in the internal-definition sequence).
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.
What is scheme macro capability?
• Powerful and flexible macro capability based on the Scheme programming language. Scheme is a dialect of the LISP language, commonly used in artificial intelligence applications The Scheme language is easily extensible. • Extends the capabilities of TracePro.
How do I use the scheme macro language with TracePro?
The Scheme macro language can be used in conjunction with the TracePro Interactive Optimizer Utility to extend the capabilities of the optimizer.
What does the after-scheme command do?
Scheme code entered in the After-Scheme column for Object 4 This command runs another Scheme macro loaded in TracePro “angle” variable used to define rotation of LEDs and lenses Scheme and the Interactive Optimizer – Example
What is Scheme language?
Scheme is a dialect of the LISP language, commonly used in artificial intelligence applications The Scheme language is easily extensible. • Extends the capabilities of TracePro. Lambda Research has extended Scheme with over 750 commands specific to TracePro. • Extends the capabilities of ACIS within TracePro.
