Spring 2021: Programming in Java Lab (PSCS)

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Resources

  • An introductory tutorial on Lex.
  • LEX & YACC TUTORIAL by Tom Niemann [1]
  • Lex Basics on javatpoint [2]
  • Lex on Windows [3]

Lab 1: Getting Started ( week of 04th January 2021 )

Q. NO. Program Lab Exercise No. Remarks
1 WAP to find the sum of any number of integers entered as command line arguments. Practice Set No. 1
2 WAP to find whether the given number is even or odd Practice Set No. 2
3 WAP to find the factorial of a given number Practice Set No. 3
4 WAP to check whether the given number is prime or not Practice Set No. 4
5 WAP to print the following pattern using nested for loop: 
    *
    *  *
    *  *  *
    *  *  *  *
Practice Set No. 5

Lab 2-3 ( week of 17th & 24th August 2020 )

Q. NO. Program Lab Exercise No. Remarks
1 Write a Lex program to count the number of vowels and consonants in a given string Practice Set No. 2(1)
2 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 ,d by e ,and so on z by c. Lab Exercise No. 2 Read about Caesar Cipher from [4]

Lab 4 ( week of 31st August 2020 )

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 5-6 ( week of 7th & 14th September 2020 )

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 7-8 ( week of 21st & 28th September 2020 )

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 9 ( week of 5th October 2020 )

Q. NO. Program Lab Exercise No. Remarks
Complete all the Lex programs i.e., Lab Exercise No.1 - Lab Exercise No.8

Lab 10-11 ( week of 2nd & 9th November 2020 )

Q. NO. Program Lab Exercise No. Remarks
1 Write a Program in YACC to evaluate an expression (simple calculator program for addition, subtraction, multiplication, and division). Lab Exercise No. 10
2 Write a YACC program to find the validity of a given expression( for operator + - * and / ). A program in YACC which recognizes a valid variable which starts with letter followed by a digit. The letter should be in lowercase only. Lab Exercise No. 9

Final Lab

Q. NO. Program Lab Exercise No. Remarks
1 Program in YACC to recognize the string "abbb‟, "ab‟, "a‟ of the langauge (anbn, n>=1). Lab Exercise No. 11
2 Program in YACC to recognize the language (anb , n>=10). (output to say input is valid or not) Lab Exercise No. 12
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