This repository is a simple implementation of a calculator that uses Reverse polish notation (RPN) in order to solve input expressions in standard infix notation.
The four basic math operations are supported and it works only with integers. If you are looking for some practical stuff to start on compiler/interpreter design, maybe this code can help you.
The repository has some sub-modules, the easiest way of cloning it is as follows:
you@Somewhere:~/src# git clone https://github.com/rafael-santiago/expr expr --recursive
Done!
Until now I successfully built it on Linux, FreeBSD, NetBSD, OpenBSD, MINIX,
Solaris and also Windows. This project uses ANSI C, so virtually you will be able to
easily build this code in any decent platform.
For my own projects I always use my own build system.
After following the steps to make hefesto work on your system all you should do is:
you@Somewhere:~/src# cd expr/src
you@Somewhere:~/src/expr/src# hefesto
After calling hefesto the codes will be compiled and some tests will run. The binary will be
within the directory ../bin.
The build was written to support GCC and also Clang. The build will detect the available
compiler and use it, GCC is used by default. If you want to force the usage of Clang
call hefesto with the following build option:
you@Somewhere:~/src/expr/src# hefesto --use-toolset=clang-c-app
Anyway, if you are not interested in running tests and all this stuff, you can build the software by hand. This is a pretty minimalist project and you can easily compile it in just one simple single command line:
you@Somewhere:~/src/expr/src# cc memory.c stack.c expr.c rpn.c main.c -oexpr
Being within the sub-directory src, supposing that you have built the program with my
build system, just call ../bin/expr.
A prompt will be shown and all you should do is to type your infix expression and so confirm it hit ENTER to get the result back.
To exit the program type CTRL+c and also confirm it with an ENTER.