本文通过一个具体的C++代码示例详细解释了数组与指针的关系，展示了如何使用指针指向数组的不同位置，并输出特定元素的值。通过代码运行结果帮助读者理解指针算术及内存地址的概念。
如下题所示：
int a[11] = {1,2,3,4,5,6,7,8,9,10,11};
int *ptr = (int*)(&a +1);
cout << *(a+1) << endl;
cout << *(ptr - 3) << endl;
请解释以上代码的输出结果：
2
9
解析：
int a[11] = {1,2,3,4,5,6,7,8,9,10,11};
cout << "*a = " << *a << endl;
cout << "*(a+1) = " << *(a+1) << endl;
cout << "&a = " << &a << endl;
cout << "&a[0] = " << &a[0] << endl;
cout << "&a[8] = " << &a[8] << endl;
cout << "&a[10] = " << &a[10] << endl;
cout << "&a + 1 = " << &a +1 << endl;
int *ptr = (int*)(&a +1);
cout << "ptr = " << ptr << endl;
cout << "ptr[-3] = " << ptr[-3] << endl;
cout << "(ptr-3) = " << (ptr-3) << endl;
cout << "*(ptr - 3) = " << *(ptr - 3) << endl;
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