Use of bit fields in C language

Through a consortium, you can manage every bit of a byte, so that it saves memory and makes full use of the information in bytes.

The value range of union state{struct Bitdata{bool d0:1;//bool: 0 or -1bool d1:1; The value range of BOOL D2:1;byte d3:1;//byte: 0 or 1byte d4:1;byte d5:1;byte d6:1;byte d7:1;} bit;//must declare a variable byte value;}; void Cmfcapplication1dlg::onbnclickedbutton4 () {state Sta;sta.value = 0x17;//Overall assignment bool A1 = Sta. BIT. d0;//take out the first bit of Sta. BIT. D0 = false;//assigns a value to the first bit//converts the value to a string CString str = sta. BIT. D0? _t ("True"): _t ("False");}

Bit fields are commonly used as device IO State management or rights management. You can actually use arrays instead of the above functions.

Use of bit fields in C language