int *p = new int[3];
...
delete[] p;

数组指针释放用 delete[]



#include "iostream"
using namespace std;

int main(){
  int *p = new int; 
  cout << *p << endl;
  *p = 3;
  cout << *p << endl;
  delete p;
  
  //
  int *p1 = new int(7);  
  cout << *p1 << endl;
  delete p1;
  
  // 
  const int N = 3;
  int *p2 = new int[N];
  int i;
  for(i=0; i < N; i++){
    *(p2+i) = i+1;
  }

  for(i=0; i < N; i++){
    cout << *(p2+i) << ' ';
  }

  cout << endl;
  delete[] p2;
  
  return 0;
}