The files in this directory contain the ANSI C grammar for the C89 version of C. To use bison/flex, type: % make -f Makefile.bison To use yacc/lex, type: % make -f Makefile.yacc To test the parser, type: % cparser < prog.c You should see the prog.c source echoed back to the stanard output. This means that the program is syntactically correct.