作为初学者,来回顾一下之前的 Lispy Calculator 表: 下面是实现 eval 的代码,完全遵循上面的表格: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 defeval(x:Exp,env=global_env)->Exp:"Evaluate an expression in an environment."ifisinstance(x,Symbol):# variable referencereturnenv[x]elif notisinstan...
在ecilisp中编写一个计算器,可以通过定义函数来实现。以下是一个简单的例子: (define (calculator) (display "Enter an expression (+, -, *, /): ") (let ((expression (read))) (let ((result (case expression ((+) (+ (read) (read))) ((-) (- (read) (read))) ((*) (* (read) (...
As a refresher, we repeat the table of Lispy Calculator forms: ExpressionSyntaxSemantics and Example variable reference symbol A symbol is interpreted as a variable name; its value is the variable's value. Example: r ⇒ 10 (assuming r was previously defined to be 10) constant literal ...
If we just had the expression (Pat Kim), it would be evaluated by considering Pat as a function and applying it to the value of the expression Kim. This is not what we had in mind. The quote mark instructs Lisp to treat the list as a piece of data rather than as a function call...
MIT. cl-string-generator - Generate string from regular expression. MIT. trivial-sanitize - clean html strings: "foo"→ "foo". LLGPL.See also:Resolve - A software for AST-based diff calculation, display, and automated resolution. Written in C++ and CL, you’ll find Lisp utilities.Tools...
LISPa simple arithmetic expression calculator. 一个简单的LISP算术表达式计算器. 期刊摘选 The child has a badlisp. 这孩子的口齿十分不清. 期刊摘选 Both C andLispwill be available as system programming languages. 和Lisp都将会成为系统的程式语言. ...
“Binding” expresses the relationship between a variable and it’s value. A variable “a” is bound to “1” when you write an expression “a = 1;” in C. In the Lisp world there are two types of binding: lexical binding and dynamic binding. ...
MIT. cl-string-generator - Generate string from regular expression. MIT. trivial-sanitize - clean html strings: "foo"→ "foo". LLGPL.See also:Resolve - A software for AST-based diff calculation, display, and automated resolution. Written in C++ and CL, you'll find Lisp utilities.Tools...
(defun calculator () (format t "Type an infix expression to evaluate it, an empty line to quit.~%") (loop (with-simple-restart (abort "Return to calculator toplevel.") (format t "? ") (let ((e (parse-with-lexer #'lexer *expression-parser*)))...
You’re sending like a big tree of a LISP expression or what… Ron: Yeah. We were sending up S-Expressions. Adam: What do you tell it? Are you telling it to reload? It’s actively running. What do you do? Ron: So the first thing that we told it was send us a back trace. ...