#include <iostream>
using namespace std;
 
struct TestStruct{};
 
class TestClass
{
public:
  TestClass() : testStruct1(nullptr) {}
 
  TestStruct* testStruct1;
  TestStruct* testStruct2{nullptr};
  TestStruct* testStruct3 = nullptr;
};
 
int main()
{
  TestClass c;
 
  if ( c.testStruct1 == NULL )
    cout << "Is NULL" << endl;
 
  if ( c.testStruct2 == NULL )
    cout << "Is NULL" << endl;
 
  if ( c.testStruct3 == NULL )
    cout << "Is NULL" << endl;
  return 0;
}
 
 

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