Comparing floating point numbers

AlmostEqual.h

/*
 * AlmostEqual.h
 *
 */

#ifndef ALMOSTEQUAL_H_
#define ALMOSTEQUAL_H_

// Usable AlmostEqual function - http://www.cygnus-software.com/papers/comparingfloats/comparingfloats.htm
bool AlmostEqual(float A, float B) {
  int aInt = *(int*) &A;
  // Make aInt lexicographically ordered as a twos-complement int
  if (aInt < 0) {
    aInt = 0x80000000 - aInt;
  }
  // Make bInt lexicographically ordered as a twos-complement int
  int bInt = *(int*) &B;
  if (bInt < 0) {
    bInt = 0x80000000 - bInt;
  }
  int intDiff = abs(aInt - bInt);
  if (intDiff <= 4) {
    return true;
  }
  return false;
}

#endif /* ALMOSTEQUAL_H_ */