运行 ID: 5118

Main.cc: In function ‘int main()’:
Main.cc:4:2: error: ‘cin’ was not declared in this scope
  cin>>a;
  ^~~
Main.cc:4:2: note: suggested alternative: ‘main’
  cin>>a;
  ^~~
  main
Main.cc:8:2: error: ‘printf’ was not declared in this scope
  printf("%.4lf %.4lf %.4lf",b,c,d);
  ^~~~~~
Main.cc:8:2: note: suggested alternative: ‘int’
  printf("%.4lf %.4lf %.4lf",b,c,d);
  ^~~~~~
  int