calculator-flex-bison-c

A tiny calculator project with lexer/parser based on Flex, Bison with pure c programming language.

Syntax

print 5;
print 100+10;
a = 50;
print a;
print a+a;
print a+100;

Easily run bash build.sh.

or do manually:

$ flex myscanner.l
$ yacc -d parser.y
$ gcc y.tab.c lex.yy.c
or
$ cc y.tab.c lex.yy.c

run ./a.out and type print 10; or etc…

Or Run parser and get contents from input.in file via linux/unix command:

$ ./a.out  < input.in
Print 5
Print 110
Print 50
Print 100
Print 150

Feel free to participate and develop.

I saw an lecture from Prof. Jonathan Engelsma and It’s encouraged me to do this project myself.