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infix-calculator

A typical command-line infix calculator.

Intended as a hands-on C++ project to get familiar with Flex and Bison.

Features

Can process semicolon-terminated expression input from both stdin and text files. Supports boolean, integral, and floating point expressions using standard arithmetic and logical operations, with C-style operator precedence. Allows line comments within input files and grouping of subexpressions with parentheses. Some simple builtin functions are available, e.g. trigonometric functions, binary min + max functions.

The calculator parser is built as a separate static or shared library that the calculator command-line tool links against. PIMPL is used to provide a stable ABI and prevent leaking Flex + Bison generated names and types into user code.

Building from source

Requires CMake >=3.16, Flex >=2.6.2, and Bison >=3.5.1. Flex and Bison can either be installed using your system package manager, e.g. for *nix systems, with an alternative being setting either environment or CMake variables with the directory location of Flex and Bison. For the latter, PDCALC_FLEX_BISON_DIR can simply be set if both Flex and Bison are in the same directory, e.g. when pointing to the location of a WinFlexBison release on Windows. If located in different directories, PDCALC_FLEX_DIR and PDCALC_BISON_DIR can be set appropriately.

*nix

Building is easy with the provided build.sh build script. For usage, type

./build.sh --help

To build release binaries for this project, simply use the command

./build.sh -c Release

Simply typing ./build.sh will build unoptimized binaries with debug symbols.

Windows

Building is easy with the provided build.bat build script. For usage, type

build --help

To build release binaries for this project, simple use the command

build -c Release

Simply typing build will build unoptimized binaries and the program database with debugging info. You can specify the target architecture using the -a flag, e.g. to build 64-bit release binaries instead of the default 32-bit ones, use

build -a x64 -c Release

Currently, the Visual Studio toolset used will be whichever is the default.