How to implement this using the bitwise & (and)?

 

This question already has an answer here:

  • What does the [Flags] Enum Attribute mean in C#? 10 answers

    • Typical patterns for testing bit flags are 

    // Entire key match  
if (returned_value & value_to_test == value_to_test) {
  ...
}

// Partial key match  
if (returned_value & value_to_test != 0) {
  ...
}

    Eg if you want to test if pocket #3 is full: 

    if (returned_value & POCKET.P3_FULL == POCKET.P3_FULL) {
  ...
}

    You can combine flags via | and test for partial match of such combined flag: 

    const int ALL_ARE_FULL = POCKET.P1_FULL | POCKET.P2_FULL | POCKET.P3_FULL;

...

// Test if any part of the flag is match (i.e. any pocket - at least one - is full)
// Please, notice != 0 comparison
if (returned_value & ALL_ARE_FULL != 0) {
   ...
}

// Compare with this: all three pockets are full
if (returned_value & ALL_ARE_FULL == ALL_ARE_FULL) {
   ...
}
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