To compile these examples, type
lex name.l
on the command line, where name.l is replaced with the name of your lex input file. This generates the lex output file lex.yy.c . Then, generate the compiler with yacc by typing (e.g.)
yacc name.y
This generates the default yacc output file y.tab.c .
To create a log file y.output that shows all the states in the parser, where parse table conflicts arise, and the transitions from one state to the next, type
yacc -v name.y

Invoke the C compiler to compile your compiler using e.g.
cc -o name y.tab.c -ll
on the command line. The output executable file is called name, so to run the program, type
./name < test.txt
where test.txt is the name of an input file.

bpb.l A lexer to ignore white space that talks with bpb.y.

bpb.y An initial cut at a yacc grammar to recognize balanced parentheses and square brackets.

dc.l A lexer to extract NUMBER tokens for use with desk calculator dc.y.

dc.y A desktop calculator written in yacc that computes results for simple arithmetic expressions.