/in/foo.cc: In function 'int main()':
/in/foo.cc:7:2: error: 'itoa' was not declared in this scope
  itoa(b,e,10);
  ^~~~
/in/foo.cc:7:2: note: suggested alternative: 'atol'
  itoa(b,e,10);
  ^~~~
  atol
/in/foo.cc:8:6: warning: unused variable 'l' [-Wunused-variable]
  int l=strlen(e);
      ^