Compile Error

/in/foo.cc: In function 'int main()':
/in/foo.cc:6:2: error: 'cin' was not declared in this scope
  cin>>a>>b;
  ^~~
/in/foo.cc:6:2: note: suggested alternative:
In file included from /in/foo.cc:1:0:
/usr/include/c++/6/iostream:60:18: note:   'std::cin'
   extern istream cin;  /// Linked to standard input
                  ^~~
/in/foo.cc:7:2: error: 'cout' was not declared in this scope
  cout<<a+b;
  ^~~~
/in/foo.cc:7:2: note: suggested alternative:
In file included from /in/foo.cc:1:0:
/usr/include/c++/6/iostream:61:18: note:   'std::cout'
   extern ostream cout;  /// Linked to standard output
                  ^~~~

信息

递交者
类型
递交
题目
迟到的 A+B
语言
C++
递交时间
2021-07-09 15:09:43
评测时间
2021-07-09 15:09:43
评测机
分数
0
总耗时
0ms
峰值内存
0 Bytes