Fall 2021: System Programming Lab

Resources

• An introductory tutorial on Lex.
• LEX & YACC TUTORIAL by Tom Niemann [1]
• Lex on Windows [2]

Lab 1: Getting Started ( week of 02^nd August 2021 )

Q. NO.	Program	Lab Exercise No.	Remarks
1	Write a Lex program to count the number of lines and characters in the input file.	Lab Exercise No. 1
2	Write a Lex Program to count number of words.	Practice Set No. 1(1)
3	Write a Lex Program to count the number of lines, tabs and spaces used in the input.	Practice Set No. 1(2)
4	Write a Lex Program to count the number of lines, words, small letters, capital letters, digits, special characters, and finally all characters.	Practice Set No. 1(3)

Lab 2: ( week of 09^th August 2021 )

Q. NO.	Program	Lab Exercise No.	Remarks
1	Write a Lex program that implements the Caesar cipher. It replaces every letter with the one three letters after(right shift) in an alphabetical order, wrapping around at Z e.g a is replaced by d ,b by e ,and so on z by c.	Lab Exercise No. 2	Read about Caesar Cipher from [3]

Lab 3: ( week of 23^rd August 2021 )

Q. NO.	Program	Lab Exercise No.	Remarks
1	Write a Lex program that finds the longest word (defined as a contiguous string of upper and lower case letters) in the input.	Lab Exercise No. 3
2	Write a Lex program that distinguishes keywords, integers, floats, identifiers, operators, and comments in any simple programming language.	Lab Exercise No. 4

Lab 4 and Lab 5: ( week of 06^th & 13^thSeptember 2021 )

Q. NO.	Program	Lab Exercise No.	Remarks
1	Write a Lex program to count the number of identifiers in a c file.	Lab Exercise No. 5
2	Write a Lex program to count the number of words ,characters ,blank spaces and lines in c file.	Lab Exercise No. 6

Lab 6: ( week of 20^th September 2021 )

Q. NO.	Program	Lab Exercise No.	Remarks
1	Write a Lex specification program that generates a C program which takes a string “abcd” and prints the following output: abcd abc ab a	Lab Exercise No. 7
2	Write a Lex program to recognize a valid arithmetic expression.	Lab Exercise No. 8

Lab 7: ( week of 27^th September 2021 )

Q. NO.	Program	Lab Exercise No.	Remarks
	Complete all the Lex programs (1-8)