Write a LEX program to count total printf and scanf statements from input file. Count should be written in output file.

%{

#include<stdio.h>

int c_s=0,c_p=0;

%}

%%

"scanf" {c_s++;}  

"printf" {c_p++;}

%%

main()

{

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

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

yylex();

fprintf(yyout,"%d printf's \n",c_p);

fprintf(yyout,"%d scanf's \n",c_s);

}

int yywrap()

{

return(1);

}