How to check bits in a byte.

[asp netProgrammer]

Hi all, i was wondering how do i check for individual bits in a byte. Like if i wanted to check if the 3rd bit in a byte was 1 or 0, how do i do that in c++?

[CPallini]

You can use binary operators (such as and) with proper operands. for example:

bool checkbit2(unsigned char b)
{
if ( b & 0x04) return true else return false;
}

returns true if third bit (which is bit 2) of b is set (note the operand 0x04, that is binary 00000100). hope that helps.

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler. -- Alfonso the Wise, 13th Century King of Castile.

[Frank K]

Hi, count the bits: 8-7-6-5-4-3-2-1

if(myByte & 0x4)
{
  //the third bit is '1'
}
else
{
  //the third bit is '0'
}

HTH