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Using bits as flags

mattd · 2001-08-03T14:39:18

Argh! This seems so easy, but I just can't get it right. All i need to know is: 1) How to check to see whether a certain bit is 1 or 0 in a variable. 2) How to set a bit in a variable to 1 or 0. That's it! As you can tell, I'm using a unsigned char in a struct to allow BOOL-type flags. I thought the answers to these questions were... #define ANIM_ISPLAYING 0x01 #define ANIM_LOOPANIM 0x02 #define ANIM_REVERSE 0x04 #define ANIM_RANDOM 0x08 // 1) How to check to see whether a certain bit is 1 or 0 in a variable. if(m_ucFlags & ANIM_LOOPANIM) // this tile loops // 2) How to set a bit in a variable to 1 or 0. m_ucFlags &= ANIM_REVERSE; // set the reverse bit m_ucFlags &= ~ANIM_ISPLAYING; // un-set the isplaying bit .. but i've seen tons of other things, and I'm all confused. Someone care to help? Thanks, -- mattd Edited by - mattd on July 28, 2001 6:12:58 AM