#include <iostream>
using namespace std;
int main()
{
    char c[] = "hello";
    char* const ch = c; //(指针常量) 如果是字符串常量的话，是在符号表中，是不允许被改变的
    
    cout <<ch <<endl; 
    *ch='g'; 
    cout <<ch <<endl;
}

        应改为：
        char p[] = "china";
    char* const ch = p; 
    cout<<ch<<endl; 
    *ch = 'g'; 
    cout<<ch<<endl;  

const char* ch = "china"; 
cout<<ch<<endl; 
ch = "12345"; 
cout<<ch<<endl;