指针变量，var和＆amp; var的差异
#include <iostream>
using namespace std;
int main() {
int* z = new int(9);
cout << "address: " << z << endl;
cout << "value: " << *z << endl;
cout << "referance: " << &z << endl;
return 0;
}
看着cout值，我期望地址和参考会提供相同的地址，但是Heres输出是什么：
address: 0x7fc452c032a0
value: 9
referance: 0x7fff5191b8d8
只是对此的原因感到好奇，是普通的值（z），堆在堆中的地址值为9，其中var（＆amp; z）是位于堆栈中的指针变量的地址？
这是一个可视化：
是
#include <iostream>
using namespace std;
int main() {
int* z = new int(9);
cout << "address: " << z << endl;
cout << "value: " << *z << endl;
cout << "referance: " << &z << endl;
return 0;
}
Looking at the cout values, I was expecting the address and reference to give the same address, but heres what the output is:
address: 0x7fc452c032a0
value: 9
referance: 0x7fff5191b8d8
Just curious about the reason for this, is the plain value(z) the address of the variable in the heap with a value of 9, where var(&z) is address of the pointer variable which is located in the stack?
Here is a visualization:
Is the
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＆amp; z指定 Adress 指针int * z在其中存储分配的adressnew Int（9）。指针
z和值9存储在内存中的两个不同位置。这里没有任何参考的概念，只有 adresses 。
&zdesignates the adress of the pointerint * zwhere you store the allocated adressnew int(9).The pointer
zand the value9are stored at two different locations in memory.There is not any notion of reference here, only adresses.
让我首先浏览一些基础知识。
一个变量是一个名称，用于指代内存中的某些位置，该位置具有我们正在使用的值。
使用'＆amp;' 获得变量的地址。
指针是存储变量地址的变量。例如，在示例中，您指的是
变量z存储值9 [new Int（9）]的地址。
现在，最终必须将此变量存储在内存中的某个位置，并且可以使用ampersand（＆amp;）访问。
这与指针和指针指针（多级指针）的作用相同。
Let me go through some of the basics first.
A variable is a name that is used to refer to some location in the memory, a location that holds a value with which we are working.
Using '&' in C/C++ we can get the address of the variable.
A pointer is a variable that stores the address of a variable. For instance, in the example you are referring to
variable z stores the address of the value 9 [new int(9)].
Now, finally this variable has to be stored at some location in the memory and this can be accessed using ampersand (&).
This is the same way the pointers and pointers to a pointer (multi level pointers) works.
上面的语句意味着
int类型声明的指针变量。上面的语句意味着一个地址分配给
int动态类型的指针变量。上面的语句意味着值
9存储在动态分配中。上面的代码行告诉指针变量的地址
z。上面的代码行告诉可变
z中存储的值。上面的代码行告诉动态创建的变量地址。
Above statement implies a pointer variable of
inttype declaration.Above statement implies an address is allocated to pointer variable of
inttype dynamically.Above statement implies value
9is stored in a dynamically allocated.Above line of code tells the address of pointer variable
z.Above line of code tells the value stored in the variable
z.Above line of code tells the dynamically created variable's address.