用new运算符初始化但个数据存储区

#include<iostream>
using namespace std;
int main() {

    int *p;
    p = new int(100);
    if (p == NULL)
    {
        cout << "allocation failure" << endl;
    }
    else
    {
        cout << "p 的值为： "<<*p << endl;
        delete p;
    }
    return 0;
}