Access to Memory Address

memcpy (txt, (char*)(0x02804C20), sizeof(txt));

//ou

volatile char * p = (char *)0x12345678; // p is pointer to byte address 0x12345678
char b = *p; // read byte from address 0x12345678

//ou

#include <cstdint>

uintptr_t p = 0x0001FBDC;
int value = *reinterpret_cast<int *>(p);