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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3
votes
1answer
32 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, ...
10
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4answers
9k views

Simple C++ calculator which follows BOMDAS rules

This was my first attempt at making a C++ calculator. The user basically inputs an expression (I'll use \$1+1*(9*(11-1))\$ as an example) and the program searches for and creates a vector for ...
2
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1answer
104 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: '+', '-', '*', '/...
5
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2answers
256 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,...
10
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2answers
135 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 ...
6
votes
2answers
96 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 ...
7
votes
1answer
51 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
90 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
126 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
123 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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1answer
69 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 ...
2
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2answers
66 views

Simple calculator in Object-oriented JavaScript

There is a simple form which takes two numbers num1, num2 and an operation op. After ...
3
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1answer
96 views

Grouping all mathematical results using a number sequence with basic math operators

Not sure how to make the title smaller. I was reading the question A truly amazing way of making the number 2016 and some of the answers referred to programatically determining the answer set. What ...
9
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2answers
5k views

Math expression parser in C#

EDIT: Added refactored version 2.0 to the end! I have a parser that is supposed to take a string similar to a math expression and return a Tuple of: An array of strings where each string ...
6
votes
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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4answers
2k views

Primitive console string calculator in C

Recenlty I have finished this primitive console string calculator in C. I need your balanced criticism, I'd like to know what I have to correct, remake and learn. Permitted operations: ...
5
votes
1answer
173 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? ...
7
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1answer
17k views

Parsing arithmetic expressions like (x + y * a + b *z)

I have this code which I wrote to parse arithmetic expressions. However, many people say there are problems with it but don't tell me what the problem is. Please let me know if you see any. Note ...
4
votes
2answers
116 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 ...
11
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1answer
1k views

Math expression evaluator

It is my second attempt to make a math expression evaluator. To evaluate an expression, I created a class that works like this: -it removes all the blank spaces -if brackets are present, it ...
4
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2answers
2k views

Recursive math expression eval

It has been very hard to use recursion, but I think that it made the code shorter and cleaner. ...
0
votes
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
vote
1answer
52 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 ...
5
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1answer
4k views

Shunting-yard algorithm for expression parser

After reading about the Shunting-yard algorithm, I decided to try to make a expression parser, before trying to make a actual language parser, using it. The way i translated the algorithm into C++ ...
4
votes
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 ...
3
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1answer
209 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
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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: ...
6
votes
4answers
12k views

Polish notation interpreter/calculator

Just for the heck of it, I wrote a simple little interpreter that takes in inputs in the form of Polish Notation. The user will input something like + 5 6 And ...
1
vote
1answer
117 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 ...
9
votes
1answer
6k views

Creating truth table from a logical statement

This code creates a truth table from a statement in logic. The statement is input as a string, and it is identified as a tautology if it is true for all true and false combinations of the variables. ...
2
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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: ...
4
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1answer
497 views

Rust Console RPN Calculator

I've been trying to teach myself Rust, and I decided that a simple console calculator would be a good project to learn from. ...
0
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5answers
20k views

Arithmetic operation from string

I have a string like str = " 4+ 6 * 30";. I have to perform an arithmetic operation on this using C#; My solution to this problem is as follows. ...
2
votes
2answers
117 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
2answers
378 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 ...
9
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2answers
33k views

Evaluating an expression with integers, +, and *, as well as -, /

There is a job interview question, and the source of the question is here. The solution is pretty simple. We just need to split the input string by + and then by *. Then we compute products in a ...
4
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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. ...
4
votes
1answer
860 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 ...
2
votes
0answers
500 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 ...
5
votes
1answer
558 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 ...
2
votes
4answers
913 views

Reverse Polish Notation Evaluation in Java

I would like to hear feedback about my code both in term of improving efficiency if possible or using other data structures. Also go ahead and let me know about code styles/patterns. ...
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 ...
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 ...
6
votes
3answers
583 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: ...
10
votes
4answers
887 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 ...
5
votes
1answer
976 views

Reading integers and evaluating an arithmetic operation in a string

This Java code is reading integers and arithmetic operations from a string and evaluating the arithmetic operation. For example: For the input "32+54*27*4/13", ...
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 ...