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Questions tagged [rpn]

For questions relating to the Reverse Polish Notation, which is a notation for mathematical expressions where the operands precede the operator.

In computing, RPN is ideally suited for a stack-based implementation, and in hardware it has a long history with HP hand-held calculators.

E.g. 1 2 + means apply the + operator to the operands 1 and 2.

198 questions
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A program which evaluates a mathematical expression by first converting it into RPN and evaluating the result using precedence of operators

#include char infix[200]; char stack[200]; char queue[200]; int count_stack = 0; int count_queue = 0; int precedence(char x) { switch (x) { case '^': return 2; case '/': return 1; case '*': …
Geek
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Swift differentiate Clear (C) and All clear (AC)

Hello I am a beginner and I am building a RPN calculator. all my operations are effectuated in a separated viewcontroller called calcengine. I have some code for the AC and I have two questions: @IBAction func AllClear(sender: UIButton) { …
kepi
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How would I add values since they are strings?

I have already tried using atoi then switching them back to strings to push, I am trying to make a rpn calculator for class so the push, pop, seek, and stack structure are how then need to be but I cant get it to add the integer values. #include…
user4872257
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Reverse Polish Notation in C

I need help implementing my code. Here is the code in C. My assignment is to create a program for reverse polish notation. Here is what I have so far. One error i have right off is "control may reach end of non void function". After the error I'm…
justjoe
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Ruby returning integer-only when item is in an array

I'm creating a reverse polish notation calculator as a 'warm-up test' for school. I've almost nailed it. The issue I'm coming across is when I run this myself, I see just the integer returned (which is desired). When I plug this into the school's…
CJ Johnson
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3 answers

C++ RPN calculator using an int stack

I am trying to write a RPN calculator in which this line of input for a simple example: 2 3 + would print: 5 and then end. I need the program to take the line of input, put the numbers on the stack, find non-numbers, check if they are operators:…
user3678093
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How to convert into RPN(Reverse Polish notation) in Scala?

I tried to convert formula to RPN(Reverse Polish Notation) in Scala. RPN: https://en.wikipedia.org/wiki/Reverse_Polish_notation But I couldn't write any code. object RPNCalclator { def convertToRPN(expr: String): String = { ??? } def…
Hiromu Masuda
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Reverse Polish Notation Calculator in C++

I'm trying to code the RPN algorithm in C++, using a string as parameter. I'm using a stack and a string to be read. I know how the algorithm works, but I don't get a correct result, I always get 0. This is my code: #include #include…
DDN
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1 answer

RPN calculator (Swift xcode) - sine, cosine, tangent, reciprocal (1/x), log (base) functions

I have build a basic RPN calculator with Swift and I need to add those functions: sine, cosine, tangent, reciprocal (1/x), log (base) & log (base10). Here is the code that I have for the basic operations: import Foundation import UIKit class…
kepi
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2 answers

String index out of range when accessing chars in a String

I'm trying to make an RPN calculator. I have done the conversion from infix to postfix, now I want to evaluate the converted expression. When I enter any expression I get error String index out of range: 1. Here's my code with what I'm supposed…
Java beginner
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3 answers

Reverse Polish Notation with a Single Variable

I've already written code that can perform the following conversions to an input string 3(7x-1)+10x-4+3x=90x+1 (3*(7x-1)+10x-4+3x)-(90x+1) 37x1-*10x+4-3x+90x1+- But now, I'm a little stuck with this last one. I know how to write the code to solve…
jonbon
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Reverse Polish Notation in Haskell

I need to write a function that takes an arithmetic expression and converts it to a string in Reverse Polish notation using Haskell. Creating a function to evaluate an RPN expression is quite easy and need not to worry about, it's only the…
lehal475
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5 answers

Datatype to store integers and arithmetic operators?

Is there any way that I can take input of numbers from users and also any arithmetic operator on a user choice when user wants to enter. I am basically trying to make a sort of calculator in which user will first enter numbers and in last the…
Sayed Hussain Mehdi
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Where has the first element of my array come from, and what is it?

I am writing a code to produce a C programmed RPN calculator using command line arguments. I am having an issue with the first calculation to be done by the program, as the first element in my array of operators is unknown to me and affects the…
Oliver Thurston
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3 answers

float addition 2.5 + 2.5 = 4.0? RPN

The code below is my subprogram to do reverse polish notation calculations... basically +, -, *, and /. Everything works in the program except when I try to add 2.5 and 2.5 the program gives me 4.0... I think I have an idea why, but I'm not sure how…
tkd_aj
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