c++复合类型（使用new来分配内存/创建动态数组、delete释放内存）

#include<iostream>
using namespace std;
int main()
{
	int nights = 1001;
	int* pt = new int;
	*pt = 1001;
	cout << "nights value = ";
	cout << nights << ":location " << &nights << endl;
	cout << "int";
	cout << "value = " << *pt << ": location = " << pt << endl;
	double* pd = new double;
	*pd = 10000001.0;
	cout << " double ";
	cout << "value = " << *pd << ": location = " << pd << endl;
	cout << "location of pointer pd: " << &pd << endl;
	cout << "size of *pt = " << sizeof(*pt) << endl;
	cout << "size of pd = " << sizeof pd;
	cout << ": size of *pd = " << sizeof(*pd) << endl;
	return 0;
	
}

int * ps = new int;
.   .   .
delete ps;

#include<iostream>
using namespace std;
int main()
{
	double* p3 = new double[3];
	p3[0] = 0.2;
	p3[1] = 0.5;
	p3[2] = 0.8;
	cout << "p3[1] is " << p3[1] << ".\n";
	p3 = p3 + 1;
	cout << "Now p3[0] is " << p3[0] << " and ";
	cout << "p3[1] is " << p3[1] << ".\n";
	p3 = p3 - 1;
	delete[] p3;
    return 0;
	
}