Using Bitwise operators on flags

Question

I have four flags

Current = 0x1  
Past = 0x2  
Future = 0x4  
All = 0x7

Say I receive the two flags Past and Future (setFlags(PAST

Answer 1

if ((flags & PAST) == PAST)
{
  // PAST is there
}

if ((flags & CURRENT) != CURRENT)
{
  // CURRENT is not there
}