Write a LEX program to copy content from input file to output file.

            

               Code :

%{

#include<stdio.h>

#include<string.h>

char line[20];

FILE *out;

%}

%%

['\n'] { fprintf(out,"%s\n",line);}

(.*)  {strcpy(line,yytext);}

%%

main()

{

yyin=fopen("input.txt","r");

out=fopen("output.txt","w");

yylex();

}

int yywrap()

{

return 1;

}