%{
#include<stdio.h>
int pc=0, sc=0;
%}
%%
“printf” { fprintf(yyout,”writef”); pc++;}
“scanf” { fprintf(yyout,”readf”); sc++;}
%%
int yywrap()
{
return 1;
}
main(int argc, char *argv[])
{
 if(argc!=2)
 {
 printf(“Usage: <./a.out> <sourcefile> <destn file>\n”);
 exit(0);
 }
 yyin=fopen(argv[1],”r”);
 yyout=fopen(argv[2],”w”);
 yylex();
 printf(“No of printf statements = %d\n No of scanf
statements=%d\n”, pc, sc);
} 

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