Материал из C\C++ эксперт
Use reinterpret_cast to cast from char pointer to integer
#include <iostream>
using namespace std;
int main()
{
int i;
char *p = "This is a string";
i = reinterpret_cast<int> (p); // cast pointer to integer
cout << i;
return 0;
}4448256"
Using reinterpret_cast: cast float to int
#include <cassert>
#include <iomanip>
#include <iostream>
#include <ostream>
using namespace std;
int main()
{
float pi = 1.1;
int ipi;
cout << setfill("0") << showbase << hex << internal;
assert(sizeof(int) == sizeof(float));
ipi = reinterpret_cast<int&>(pi);
cout << "pi bits=" << setw(10) << ipi << "\n";
}pi bits=0x3f8ccccd
