README.md

Calculator

A Calculator program made with C++

This is a personal project to make my maths homework easier and for fun. This calculator can:

• Store Variables
• Calculate solutions
• Read variables and store them from a .txt file
• Compile on Windows, Linux && Mac (Maybe BSD?)

Instructions:

Prerequisites:

• You must have a C++ compiler, eg GNU C/C++ Compiler
• You can use an external Expression Parser eg. ExprTk.

The guide:

(1) Clone the repo to a directory on you computer, eg.

C:\Program Files (x86)\Microsoft\Temp

~/Downloads

(2) Extract the zip so you are left with:

You can remove everything but these

Minimum Things you NEED:

calculator:
/
|
\--->src
|   \--->main.cpp
|
\--->muparser
    \---> (ALL MUPARSER HEADERS)
    |
    \---> (ALL MUPARSER CPP FILES)

(2.5)

How to use another parser

If you want to use another parser, you just need to change one function, the parseStringMap() function. For example, here is the same program using the `ExprTk` parser.

#include <string>
#include <map>
#include <cmath>
#include <iostream>
#include "exprtk.hpp"

double parseStringMap(const std::string& equation, const std::map<std::string, double>& variables) {
    typedef exprtk::symbol_table<double> symbol_table_t;
    typedef exprtk::expression<double> expression_t;
    typedef exprtk::parser<double> parser_t;

    try {
        symbol_table_t symbol_table;
        expression_t expression;
        parser_t parser;

        for (const auto& pair : variables) {
            symbol_table.add_variable(pair.first, pair.second);
        }

        expression.register_symbol_table(symbol_table);
        parser.compile(equation, expression);

        return expression.value();
    }
    catch (const std::runtime_error& e) {
        std::cout << e.what() << '\n';
        return NAN;
    }
}

(3) Now you can compile it (muParser)

Do g++ -std=c++17 -o main src/main.cpp muparser/muParser.cpp muparser/muParserBase.cpp muparser/muParserBytecode.cpp muparser/muParserCallback.cpp muparser/muParserError.cpp muparser/muParserTokenReader.cpp to include all the libraries

(4) Now run the binary.

---

Usage:

The program says all. No need for me to explain.