程序代码：

#include<iostream>
using namespace std;
void main()
{
    const int i=40;
    cout<<i<<endl;
    int *p;
    p=(int*)&i;//强制类型转换为变量//
    *p=90;
    cout<<i<<endl;
    cout<<*p<<endl;
    *p=100;
    cout<<i<<endl;
    cout<<*p<<endl;
}