/in/foo.cc: In function 'int build()':
/in/foo.cc:50:1: warning: no return statement in function returning non-void [-Wreturn-type]
 }
 ^
/in/foo.cc: In function 'int read()':
/in/foo.cc:17:13: warning: 'c' is used uninitialized in this function [-Wuninitialized]
  while(c<'0'||c>'9')
        ~~~~~^~~~~~~