foo.cc: In constructor 'Array::Array()':
foo.cc:20:35: error: 'NULL' was not declared in this scope
   20 |                 this->arrayHead = NULL;
      |                                   ^~~~
foo.cc:1:1: note: 'NULL' is defined in header '<cstddef>'; did you forget to '#include <cstddef>'?
  +++ |+#include <cstddef>
    1 | // Test.cpp : 定义控制台应用程序的入口点。
foo.cc: In constructor 'Array::Array(int*, int)':
foo.cc:26:40: error: 'NULL' was not declared in this scope
   26 |                 DataUnit *ptrNewUnit = NULL, *ptrPriorUnit = NULL;
      |                                        ^~~~
foo.cc:26:40: note: 'NULL' is defined in header '<cstddef>'; did you forget to '#include <cstddef>'?
foo.cc:35:33: error: 'ptrPriorUnit' was not declared in this scope
   35 |                                 ptrPriorUnit = ptrNewUnit;
      |                                 ^~~~~~~~~~~~
foo.cc:39:33: error: 'ptrPriorUnit' was not declared in this scope
   39 |                                 ptrPriorUnit->next = ptrNewUnit;
      |                                 ^~~~~~~~~~~~
foo.cc: In member function 'bool Array::DeleteByIndex(int)':
foo.cc:55:52: error: 'NULL' was not declared in this scope
   55 |                         DataUnit *ptrCurrentUnit = NULL, *ptrPriorUnit = NULL;
      |                                                    ^~~~
foo.cc:55:52: note: 'NULL' is defined in header '<cstddef>'; did you forget to '#include <cstddef>'?
foo.cc:59:33: error: 'ptrPriorUnit' was not declared in this scope
   59 |                                 ptrPriorUnit = ptrCurrentUnit;
      |                                 ^~~~~~~~~~~~
foo.cc:62:29: error: 'ptrPriorUnit' was not declared in this scope
   62 |                         if (ptrPriorUnit == NULL)
      |                             ^~~~~~~~~~~~
foo.cc: In member function 'void Array::Display()':
foo.cc:86:44: error: 'NULL' was not declared in this scope
   86 |                 DataUnit *ptrCurrentUnit = NULL;
      |                                            ^~~~
foo.cc:86:44: note: 'NULL' is defined in header '<cstddef>'; did you forget to '#include <cstddef>'?
foo.cc:90:25: error: 'cout' was not declared in this scope
   90 |                         cout << ptrCurrentUnit->data << " ";
      |                         ^~~~
foo.cc:1:1: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
  +++ |+#include <iostream>
    1 | // Test.cpp : 定义控制台应用程序的入口点。
foo.cc:93:17: error: 'cout' was not declared in this scope
   93 |                 cout << endl;
      |                 ^~~~
foo.cc:93:17: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
foo.cc:93:25: error: 'endl' was not declared in this scope
   93 |                 cout << endl;
      |                         ^~~~
foo.cc:1:1: note: 'std::endl' is defined in header '<ostream>'; did you forget to '#include <ostream>'?
  +++ |+#include <ostream>
    1 | // Test.cpp : 定义控制台应用程序的入口点。
foo.cc: In function 'int main(int, char**)':
foo.cc:101:9: error: 'cin' was not declared in this scope
  101 |         cin >> nSize;
      |         ^~~
foo.cc:101:9: note: 'std::cin' is defined in header '<iostream>'; did you forget to '#include <iostream>'?
foo.cc: In member function 'bool Array::DeleteByIndex(int)':
foo.cc:83:9: warning: control reaches end of non-void function [-Wreturn-type]
   83 |         }
      |         ^

[Hydro](https://hydro.ac)提供评测服务