Lex Program to remove comments from C program
Lex is a computer program that generates lexical analyzers. Lex reads an input stream specifying the lexical analyzer and outputs source code implementing the lexer in the C programming language.
The commands for executing the lex program are:
lex abc.l (abc is the file name) cc lex.yy.c -efl ./a.out
Let’s see LEX program to accept string starting with vowel.
Examples:
Input : //testing #includeint main() { /* multiline comment continue.... */ return 0; } Output : #include int main() { return 0; }
Below is the implementation:
/% Lex Program to remove comments from C program and save it in a file %/ /*Definition Section*/ %{ %} /*Rule Section*/ %% /*Regular expression for single line comment*/ \/\/(.*) {}; /*Regular expression for multi line comment*/ \/\*(.*\n)*.*\*\/ {}; %% /*Driver function*/ int main() { yyout=fopen("out.c","w"); yylex(); return 0; } |
chevron_right
filter_none
Output:
Recommended Posts:
- Lex program to take input from file and remove multiple spaces, lines and tabs
- C Program for Program to find area of a circle
- C Program for Program for array rotation
- C program to detect tokens in a C program
- C Program for Cutting a Rod | DP-13
- Program to print Hut
- How does a C program executes?
- C Program to Add two Integers
- C Program for ID3 Tagging
- Program Execution in the CPU
- C Program for Fibonacci numbers
- C Program for Merge Sort
- C Program for Pancake sorting
- C Program for Selection Sort
- C program for pipe in Linux
If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.
Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.
