error: cannot increment value of type 'char [6]'

I am trying to learn pointers and string literals in C/C++. As per my understanding, string literals are char arrays with a null \0 at the end. Also we can basically do all the pointer arithmetic operations on array like increment and decrement.

But when I am trying to run the following code:

#include <iostream> 
using namespace std;

int main (){
    char *c ="Hello";
    char d[6];

    while(*d++ = *c++);

    cout<<c<<endl<<d;
} 

I am getting the following error,

error: cannot increment value of type 'char [6]'
    while(*d++ = *c++);

My assumption for this code was, that the values of string literal c will be copied to char array d.