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        Easy Ways Guide to Run Lex and Yacc Program on ubuntu This post will show you how to run Lex and Yacc programs easily on ubuntu 12.04 I have assumed that you have a working Ubuntu 12.04 LTS version installed on your system and the computer is connected to the network . Ubuntu does not come installed with a lex and yacc compiler to do so install it first by 1. Opening the terminal 2. type  sudo apt-get install flex 3. enter your password after installation of flex finishes 4. type sudo apt-get install bison 5. enter your pasword. Successfully  Lex and Yacc have been installed on your system. Running a Lex and Yacc program                  1. write the lex program in a file and save it as file.l (where file is the name of the file). 2. open the terminal and navigate to the directory where you have saved the file.l  (e.x CD Desktop) 3. type  lex filename.l 4. then type   cc lex.yy.c -lfl 5. then type  ./a.out Your le

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