Code:

 


unsigned char pht(unsigned char a, unsigned int b)
{
 long t;
 t = a + b; /* This line is redundant because of the following line */
 t = (2 * a) + (2 * b); /* simpler: t = 2 * (a + b); */
 t = t ^ 0xa9; /* assumes you don't care about high bits of big chars */
 t = t ^ a;
 return t;
}