大一上学期的一点小疑惑，代码验证ok

 #include<iostream>
 using namespace std;
 class test
 {
     int *p;
     int pn;
 public:
     test(int n) { p = new int[n]; pn = n; }
     void setp();
     int* getp() { return p; }
     int getpn() { return pn; }
 };
 void test::setp()
 {
     int choice;
     cout << "1:自动填充\n2:手动填充" << endl;
     cin >> choice;
     switch (choice)
     {
     case :
         for (int i = ; i < pn; i++)
             p[i] = i;
         break;
     case :
         for (int i = ; i < pn; i++)
             cin>>i;
         break;
     }
 }
 void main()
 {
     test A();
     A.setp();
     int*b = new int[A.getpn()];
     b = A.getp();
     for (int i = ; i < A.getpn(); i++)
         cout << b[i] << endl;
 }