// this code illustrates pointers to basic types
#include <iostream>
#include <cstdint>
using namespace std;

void multiply_by_8(int *value_pointer);

int main() {
  {
    // create a block for this code to separate it from the other

    float some_number = 1e30;
    float *pointer_to_some_number = &some_number;
    cout << "Enter divisor: ";
    float divisor;
    cin >> divisor;
    *pointer_to_some_number /= divisor;
    cout << "After dividing by " << divisor << ", some number is "
         << some_number << endl;
    cout << "Address of some_number: " << hex << int64_t(&some_number) << endl;
    cout << "  ... and its pointer:  " << hex << int64_t(pointer_to_some_number)
         << endl;
  }
  {
    // another block illustrating calling multiply_by_8
    int value = 7;
    multiply_by_8(&value);
    cout << "7 times 8 = " << dec << value << endl;
  }
  return 0;
}

void multiply_by_8(int *value_pointer) {
  cout << "Value pointer's value: " << hex << int64_t(value_pointer) << endl;
  cout << "What value pointer points *at*, before multiplying: " 
       << dec << *value_pointer << endl;
  // do it in two steps, just because
  value_pointer = *value_pointer * 2;
  // alternative way:
  *value_pointer = *value_pointer << 2; // multiply by 4
}