View Compilation Error

0_0_38872525_28714.cpp: In function 'int main()':
0_0_38872525_28714.cpp:4:9: error: 'cout' was not declared in this scope
    4 |         cout << "请输入一个正整数：" << endl;
      |         ^~~~
0_0_38872525_28714.cpp:4:40: error: 'endl' was not declared in this scope
    4 |         cout << "请输入一个正整数：" << endl;
      |                                        ^~~~
0_0_38872525_28714.cpp:5:15: error: 'cin' was not declared in this scope
    5 |         for (;cin >> n;)
      |               ^~~