Lex&Yacc编译器 经过: 约瑟夫·扬科夫斯基杰森·奥特(Jason Otter) 伊恩·尼根(Ian Nyguen) C ++ prgoram将解析source.txt并删除注释,空格和换行符。 \ 结果在临时文件中: PROGRAM aba13; VAR ab5, cb, be, eb : INTEGER; BEGIN ab5 = 5; cb = 10; PRINT('ab5=', ab5); eb = cb + ab5; PRINT( eb ); be = 2 * ab5 + eb; PRINT( be ); END. 然后使用ma