Questions tagged [math-expression-eval]

Questions related to the parsing (and possibly the evaluation) of free-form mathematical expressions in strings, lists, or streams

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4
votes
1answer
40 views

Evaluate mathematical expression in reverse Polish notation in C

This is a program exercise from The C Programming Language by Kernighan and Ritchie (Chap 5). It is based on my earlier question here on Stack Overflow. One user suggested to submit my code here, ...
6
votes
2answers
97 views

JavaRPN calculator

I have found that there is a distinct lack of an RPN calculator available to me, so I decided to make my own. I am still adding new functions to it, but as of now, I would like to refactor my code. ...
7
votes
1answer
54 views

Arithmetic/Geometric series calculator

I've written a small program that calculates Arithmetic and Geometric Partial Sums. I'd like feedback on anything possible, since I intend on writing a cheatsheet that encapsulates all PreCalculus ...
10
votes
2answers
136 views

Synthetic division calculator

I've written a python program do perform synthetic division on a polynomial. There are a few constraints (listed in the module docstring of the program) on the polynomial, mainly because I haven't had ...
7
votes
1answer
54 views

Infix to postfix conversion in C++

Here is a program for conversion of an infix expression to a postfix expression using a stack. I would like to know how I could improve my checking for invalid input, make my code more expressive, and ...
6
votes
1answer
91 views

Shunting-yard Algorithm, implemented based on reference pseudocode

I have a lot of problems making this code look more elegant or to reduce its size. The algorithm is mostly copied from the pseudocode of wikipedia page. The difference is I prepare my string with the <...
6
votes
3answers
129 views

Evaluating a math expression given in string format

I am currently working on building a calculator using Java and JavaFX to practice my coding skills. I wrote the following methods to evaluate a given expression. What can I improve? Is there ...
4
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1answer
127 views

Python Calculator using Postfix Expressions

Improved upon my previous calculator program. This program has the following features: Gives information using session prompts. Supports all common operators. Follows operator precedence. Use of ...
2
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2answers
67 views

Simple calculator in Object-oriented JavaScript

There is a simple form which takes two numbers num1, num2 and an operation op. After ...
6
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3answers
117 views

Postfix calculator in Java

I made a postfix calculator in Java. The code performs the functions I planned without problems, However, I'm not satisfied with it, because it's too verbose and I couldn't split it up into methods ...
1
vote
1answer
70 views

Calculator for any number of inputs

The "nasty implementation" I mentioned is within the void calculator() inside of calculator.cpp. Everything goes well as long as ...
4
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2answers
118 views

Parsing infix expressions in Clojure

I'm trying to teach myself Clojure by reading the Brave Clojure book online, and at the end of Chapter 7 there is an exercise to parse a mathematical expression written as a list in infix notation to ...
0
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1answer
43 views

Convert natural input into Python executable function

I have been developing a graphical calculator, and to allow for natural user input I have written a function which converts their input into a python readable form. This is my first time using regex, ...
1
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1answer
53 views

Evaluating an arithmetic expression from a binary tree

Let's say I have a Binary Tree that looks like + 2 * 5 8 I've written a function to traverse inorder to solve it as 2+5*8 Is ...
4
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1answer
177 views

Writing monadic Haskell to evaluate arithmetic expression

I have been studying Haskell by myself for about a little over a year. And I have been stuck at monad/monad transformers for quite a while until recently some examples I read online enlightened me. So ...
2
votes
1answer
70 views

Python implementation of Conway's chained arrow notation

A year ago, I implemented an evaluation algorithm for Conway's chained arrow notation in Python. I'd like to get a review on my code, especially about readability and if it is pythonic. I'd also like ...
3
votes
1answer
220 views

Infix to postfix notation in Haskell (Shunting-yard algorithm)

I've written an infix to postfix converter in Haskell using the Shunting-yard algorithm. Example of how it works: ...
1
vote
1answer
107 views

Reverse Polish Notation evaluator in Haskell

I've created an RPN evaluator in Haskell, as an exercise because I'm new to this language. It runs well: $ ./rpn 2 3 4 5 + - + -4 And the source code: ...
1
vote
1answer
120 views

Calculate simple arithmetic string in Scala

Problem Given an arithmetic string like 2+2*3 calculate result 8. Assumptions you can make string will be always well formed (no error checking needs to be done) only operators passed in string ...
2
votes
1answer
106 views

Calculate arithmetic expression represented by a string, in Java

I saw that interview question online and gave it a try: Implement a function that gets a string which represents an arithmethic expression: contains only numbers or the the operators: '+', '-', '*', '/...
2
votes
0answers
60 views

RPN calculator in Chicken Scheme

My first attempt at Scheme (Chicken Scheme) - a simple RPN calculator. Please comment on exception handling as well as the general coding style. Here is the code: ...
2
votes
2answers
118 views

JS calculator, respecting order of operations

I have a function that receives an array of numbers and operations Ex: userEntry = [3,+,3,x,3] -> returns 12 It is a calculator that adheres to the proper ...
5
votes
1answer
175 views

Recursive descent parser for simple arithmetic expressions grammar

What I'd like to see in your review, in order of relevance: Is there any bugs? (I see none, but...) Is the code efficient? (by whatever metric you'd like to use) Is the code easy to understand? ...
5
votes
2answers
392 views

Basic arithmetic calculator with float, parentheses and operator priority support

Summary: The basic calculator which allows the end-user to calculate the value by evaluating the math expression string. It supports all the main arithmetic operators, also extended by modulo and ...
4
votes
0answers
155 views

Python expression calculator [closed]

This is a calculator I created. It can take all basic operators, including brackets. I am a beginner with Python so I want to know what can I do better next time I write something similar. ...
5
votes
2answers
258 views

Converting Reverse Polish to Infix Notation in Java

I am trying to solve a programming challange that involves converting reverse polish notation to infix notation. For example: 1 3 + 2 4 5 - + / would be: ((1+3)/(2+(4-5))) My solution so far does work,...
2
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0answers
502 views

Binary Expression Tree

I implemented a binary expression tree, I've used my previous shunting-yard parser to provide it the post-fix expression. I have a few specific questions outside of just comments about making it ...
4
votes
1answer
871 views

Use Infix expression to construct a binary expression tree

Problem statement Construct a binary expression using infix expression. The infix expression uses extra parenthesis to enforce the priority of operators. For example, infix expression ...
5
votes
1answer
581 views

Shunting-yard algorithm

I implemented the Shunting-yard algorithm in Python, I have experience in C# but I'm looking for comments making this more pythonic. I'm also be interested if these methods would be better as ...
6
votes
3answers
1k views

Reverse Polish Notation calculator with unit tests

I had an interview with a global company yesterday. They had given me a programming assignment. I shared my screen and I must have finished the task in 1.5 hours. Task was programming Reverse Polish ...
7
votes
3answers
3k views

Console calculator, takes a string as input (like: 2+3*4-1+3) and outputs the result

I am a beginner programmer(solo learning). I know the basics of c/c++, but I would not consider myself too experienced. Recently I decided to make this calculator which takes an array of characters as ...
10
votes
4answers
894 views

Validator for mathematical expression in infix form

This program will validate whether a mathematical expression entered by the user is a valid expression based off whether the expression itself has been entered with the correct scope openers and scope ...
14
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3answers
1k views

Equation Evaluator

I am currently applying to many Software Engineer positions, and have been asked to complete several coding challenges. The most recent was an equation evaluator, written in C++, that was supposed to ...
4
votes
2answers
3k views

Expression calculator in Python

This calculator accepts four operators: +, -, *, /, and works with parentheses. Feedback on how I could make it easier to read and or more effective would be much appreciated. This is the first time ...
6
votes
1answer
177 views

String to token vector for expression parsing

My objective is to create a linear algebra calculator that would be able calculate expressions containing vectors, matrices, (eventually complex numbers/imaginary; quaternions), and real numbers. I've ...
3
votes
2answers
197 views

CodeWars - Three-pass compiler for arithmetic expressions

I'm looking for feedback on my solution to the Tiny Three-Pass Compiler kata on CodeWars. The kata is to implement a compiler for an arithmetic language in three passes - parsing to an AST, constant ...
6
votes
3answers
587 views

Simple parenthesis removal - JavaScript

I solved the following problem: You will be given a mathematical string and your task will be to remove all braces as follows: ...
1
vote
1answer
217 views

Stack calculator in Racket

I have implemented a stack calculator based on this programming task. I wondered if a more experienced racketeer could give me feedback and tell me if I am missing anything in Racket that would enable ...
9
votes
3answers
6k views

Python calculator taking string input

It accepts string input like '1+1' instead of num1 = 1, num2 = 2, operation = '+' or something like that. ...
1
vote
1answer
237 views

Equation parser + solver

Here is an equation parser that I just wrote. My focus was on readability and the prospect of adding new features in the future. Since I like a somewhat functional style, I also gave type annotations, ...
1
vote
1answer
75 views

Infix to postfix Converter implementation

Please suggest some ways to improve my code for calculating a postfix expression from an infix expression entered by the user. The size of the input (Infix string) ...
2
votes
2answers
4k views

Simple calculator to evaluate arithmetic expressions

I've studied Java for 2 and a half months. Got bored and decided to make a basic calculator that takes any basic expression with 2 integers/doubles. E.g. 5.5x10, 5+5, 5-2.5, 6/2. Is this a good way ...
4
votes
1answer
416 views

Interpret English as Math and Perform Operations

The idea is to accept an English string of math operations and evaluate it from left to right. Regarding Order of Operations: when speaking operations aloud, it is often with implied parenthesis ...
1
vote
1answer
142 views

Riemann Sum Class (with variable endpoint behavior)

Here is my class for calculating a Riemann Sum. I did a cursory google search for a built-in function with these specifications but didn't find anything (I'm sure I just missed it or didn't look hard ...
1
vote
0answers
405 views

Infix to RPN converter using the Shunting-Yard Algorithm

I need to be able to parse simple equations in an app I'm writing, and decided to try writing my own parser. I ended up using the Shunting-Yard Algorithm to convert from infix notation to RPN as the ...
2
votes
2answers
2k views

Evaluate string as boolean expression for Robot Framework

I wrote this code as a part of a series of major upgrades to my nestable Robot Framework For Loop that will allow it to evaluate logical expressions written in a single cell from the Robot Framework ...
2
votes
2answers
785 views

Python PEMDAS calculator [closed]

The goal of this calculator is to evaluate an expression with PEMDAS in mind (no parenthesis yet, adding soon). Although the program works, I want to make it as efficient as possible with the approach ...
1
vote
1answer
389 views

Analyzing an arithmetic expression using stacks

I'm looking for some constructive (harsh) criticism of a homework I've done (the code works fine). Also Is there a better/another way to solve the exercise? Exercise: Read an arithmetic expression ...
4
votes
1answer
112 views

Python basic arithmetic compiler

I am attempting to follow the "Let's build a compiler" tutorials, in order to build a basic language compiler for a custom assembly language. Currently the specs of my compiler are: Accepts a ...
7
votes
1answer
856 views

Infix to postfix converter

I've written this infix to postfix converter using this website as an helper. At the end of the web page, there is the procedure for the algorithm. A summary of the rules follows: Print ...