%{
#include<stdio.h>
int pc=0, sc=0;
%}
%%
“printf” { fprintf(yyout,”writef”); pc++;}
“scanf” { fprintf(yyout,”readf”); sc++;}
%%
int yywrap()
{
return 1;
}
main()
{
yyin=fopen(“input.txt”,”r”);
yyout=fopen(“output.txt,”w”);
yylex();
printf(“No of printf statements = %d\n No of scanf statements=%d\n”, pc, sc);
}