For my little cognitive pointer

#include<iostream>
using namespace std;
int main(){
int a=12;
char *p;
p =(char*)&a;
*p='a';
cout<<(char*)(&a);
cout<<&a;
cout<<*(&a);

return 0;
}

& A is a return address (may also be called a pointer) and a pointer type of the data type to be consistent with the extracted value must tell the computer to use this is an address to fetch the address value * (& a) corresponding to the address for fetching the value of the memory address

p = & a ; if such assignment would directly above error: This is because & a return address is the integer p is indeed character data address pointer should convert an integer to a character pointer which will herein as char address of the data to find the relevant addresses the reader can be observed above

cout<<(char*)(&a);和

<< * COUT (& A ); 
the result is not the same

error: cannot convert ‘int*’ to ‘char*’ in assignment
p=&a;