foo.c: In function 'same':
foo.c:12:12: error: 'vocL' undeclared (first use in this function)
     for(;i<vocL;++i,++j)
            ^
foo.c:12:12: note: each undeclared identifier is reported only once for each function it appears in
foo.c:13:15: error: 'artL' undeclared (first use in this function)
         if(j>=artL || voc[i]!=art[j])
               ^