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C-/C++-Quelltext

#include <cstdint>
#include <limits>
#include <cstring>

std::uint32_t float_as_int(float f)
{
  static_assert(sizeof(float) == sizeof(std::uint32_t), "float not 32 bits wide");
  static_assert(std::numeric_limits<float>::is_iec559, "float not IEEE 754 compliant");
  
  std::uint32_t i;
  std::memcpy(&i, &f, sizeof(std::uint32_t));

  return i;
}

float int_as_float(std::uint32_t i)
{
  static_assert(sizeof(float) == sizeof(std::uint32_t), "float not 32 bits wide");
  static_assert(std::numeric_limits<float>::is_iec559, "float not IEEE 754 compliant");
  
  float f;
  std::memcpy(&f, &i, sizeof(std::uint32_t));
  
  return f;
}

int main()
{
  return int_as_float(float_as_int(42.0f));
}