Flex/Lex program to detect white-space, tab, single line comments, multiple line comment and Remove it | Tech With Code
Flex/Lex program to detect white-space, tab, single-line comments, multiple line comments, and Remove it:
Today I will show you how to write a Lex/Flex program that detects white-space, tab, single-line comments, multiple line comments, and after that remove all of these and print that as an output.
Also Read:- LEX-FLEX-program-to-check-for-Even-Odd-Decimal
Example:
Input:-
This is TechWithCode.comHere You will get all programming Source Code
//this is first single line comment
//this is second single line comment
/*this
is
multiple
line
comments
*/
OutPut:-
No. of spaces=8No. of tabs=1
No. of Single Line Comments=2
No. of Multiple Line Comments=1
After Removal:-
ThisisTechWithCode.comHereYouwillgetallprogrammingSourceCode
Source Code of Flex program:-
%{#include<stdio.h>
#include<stdlib.h>
int slc=0, sc=0, tc=0, flag =0, mlc=0;
%}
%%
" " {sc++;} //space counter
\t {tc++;} //tab counter
"//".*\n {slc++;} //single line comment
"/*"[^*/]*"*/" {mlc++;} // multiple line comment
%%
int yywrap(){return 1;}
main()
{
yyin=fopen("input.txt","r");
printf("After Execution:-\n\n");
yylex();
printf("\n\nIn the Input File,");
printf("\nNo. of spaces=%d",sc);
printf("\nNo. of tabs=%d",tc);
printf("\nNo. of Single Line Comments=%d",slc);
printf("\nNo. of Multiple Line Comments=%d",mlc);
}
OutPut of Flex Program:-
Must Read:- TCS CodeVita Question With Solution
Final Word:-
In this article, We have explained to you how to write a Flex/Lex program to detect white-space, tab, single-line comments, multiple line comments, and Remove it. We hope you like it
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