帮助指针！ ！

问题描述

I understood most of the code but I am unclear on what the line ptr=-2 does to the overall code
    I mean does it change address of ptr or something ?

#include <iostream>

using namespace std;

void processptr(int *ptr)
{
    for(int i=4;i>2;i--)
    {
        (*ptr)*=i;
        ptr-=2;
    }
}

int main()
{
    int numbers[]={2,4,8,10};
    int *ptr=numbers+3;
    cout<<*ptr;
    cout<<'\n';
    processptr(ptr);
    cout<<'\n';
    for(int i=0;i<4;i++)
    {
    cout<<numbers[i]<<"@";
    cout<<"\n"<<i;
    }

    return 0;
}

我的尝试：



我尝试运行代码并查看输出但我仍然无法完全理解代码

What I have tried:

I tried Running the code and seeing the output but I still can't fully understand the code

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