Using reinterpret_cast: cast float to int : reinterpret_cast « Development « C++ Tutorial

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2. Development
3. reinterpret_cast

#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