/in/foo.cc: In function 'int main()':
/in/foo.cc:6:51: error: expected primary-expression before '<<' token
  if(((int)a-(int)b)%2!=0) cout<<(char)((int)a+1)<<<<(char)((int)b+1)<<endl;
                                                   ^~
/in/foo.cc:8:26: error: expected primary-expression before '<<' token
  cout<<(char)((int)a-1)<<<<(char)((int)-1)<<endl;
                          ^~