C Programming: Bit Masking

Bit Masking Table:

1     - > Bit 1
2     - > Bit 2
4     - > Bit 3
8     - > Bit 4
16   - > Bit 5
32   - > Bit 6
64   - > Bit 7
128 - > Bit 8

Example:

if(buffer[0] & 1 == 0) 

{

    // Frist bit is set to 0

}
else

{

   // First bit is set to 1

} 

if(buffer[0] & 64 == 0) 

{

    // Bit number 7 is set to 0

}

else

{

    // Bit number 7 is set to 1

}