运行 ID: 20816

Main.cc: In function ‘int main()’:
Main.cc:5:2: error: ‘cin’ was not declared in this scope
  cin>>a;
  ^~~
Main.cc:5:2: note: suggested alternative:
In file included from Main.cc:1:0:
/usr/include/c++/7/iostream:60:18: note:   ‘std::cin’
   extern istream cin;  /// Linked to standard input
                  ^~~
Main.cc:7:7: error: ‘i’ was not declared in this scope
   b=1/i+b;
       ^
Main.cc:12:16: error: ‘i’ was not declared in this scope
  printf("%.0f",i);
                ^