Program to count the no of ‘scanf’ and ‘printf’ statements in a C program. Replace them with ‘readf’ and ‘writef’ statements respectively. | Compiler Design Programs | Lex Programs

Compiler Design Program Lab :

%{

#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);

}