Description
In Lisp and its variants, function calls are done using parenthesis where the first item in the parenthesis is the function being called and the following items are arguments to the function. Given a mathematical ( + - * / ) expression using this notation, return the result. Note: In Lisp, functions that normally take only two arguments can be called with many arguments, with the function being applied to all elements from left to right.
Simple example
(+ 1 1 1 1 1)
would give 5.
Complicated example
(* (* 10 (+ 1 4)) (+ 10 (/ 12 2 3) 1) 0.1)
would give 65.
Solution Stats
Problem Comments
3 Comments
Solution Comments
Show comments
Loading...
Problem Recent Solvers96
Suggested Problems
-
Convert a numerical matrix into a cell array of strings
2402 Solvers
-
647 Solvers
-
353 Solvers
-
5659 Solvers
-
157 Solvers
More from this Author56
Problem Tags
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
it seems look-up table solutions are becoming a bit of an issue, could you please add a few test cases to discourage this? +1 for random test cases that are a bit harder to trick, for example something like n=randi(100,1,randi(10)); expr = "(+" + string(num2str(n))+ ")"; assert(isequal(eval_lisp(expr), sum(n)));
I think another test case with multiple expressions would be equally useful. Even something as simple as (+ 1 (* 2 3) 4) would prevent some of the look-up solutions. Make some of those values random, and it will work even better.
Good problem, and better than 44374. Precedence is clear.