What does &p, *p, p, * (&p) mean?

int *p;

P=new Int[3];

P[0]=1;

p[1]=2;

p[2]=3;

&p, *p, p, * (&P) What does each of these three mean?

Here, new int[3] Returns a pointer to the exact type of object requested, which is exactly the address of the first element of the array, that is, the first address of the value.

So &p is the address of the pointer p, which is the address of the pointer to the first address of the array.

*p: The * is used for the indirect reference of pointers (the third use of *, the other two usages are: multiplication and defining pointers). When you indirectly reference a pointer, you get the variable content pointed to by the pointer. Here is the first element of the array to get the contents, that is, 1;

P: Is the first address of the array.

* (&P): Gets the contents of the pointer p address, which is the content that points to the first address of the array.

A draft was drawn at the fingertips. A little ugly, it will look.

The code is as follows:

#include <iostream>using namespace Std;int main () {int *p;p=new int[3];p [0]=1;p[1]=2;p[2]=3;cout<<&p <<endl; Gets the address of the pointer p, which is the address of the pointer to the first address of the array cout<<* (&P) <<endl;//Gets the contents of the pointer p address, that is, the contents of the first address of the array. cout<<*p<<endl;//gets the contents of the address that the pointer points to cout<<p<<endl; Gets the contents of the pointer p stored for (int i=0;i<3;i++) {cout<<&p[i]<< "\ t" <<P[I]<<ENDL;}

Operation Result:

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Personal opinion, wrong to welcome correct.

What does &p, *p, p, * (&p) mean?