/in/foo.cc: In function 'int main()':
/in/foo.cc:6:10: warning: right operand of comma operator has no effect [-Wunused-value]
  cin>>a,b;
          ^
/in/foo.cc:13:32: warning: format '%lld' expects argument of type 'long long int', but argument 2 has type 'long long int*' [-Wformat=]
    printf("%lld,%lld",&c," ",&d);
                                ^
/in/foo.cc:13:32: warning: format '%lld' expects argument of type 'long long int', but argument 3 has type 'const char*' [-Wformat=]
/in/foo.cc:13:32: warning: too many arguments for format [-Wformat-extra-args]
/in/foo.cc:7:3: warning: 'b' is used uninitialized in this function [-Wuninitialized]
  c=b;
  ~^~