Linux-c对一个十六进制数的某一位取反

 enum SWITCH_FLAG {
   SWITCH_ALL_FLAG       = ,
   SWITCH_WEB_FLAG       = ,
   ……
 }

 unsigned int switch_by_bit_value = 0x7FFFFFFF;

 void switch_set_bit(int*a,int position,int flg)
 {
     int b=<<position;
     if(flg==){
         *a&=~b;
     }
     else{
         *a|=b;
     }
 }

 switch_set_bit(&switch_by_bit_value,SWITCH_WEB_FLAG,);
 switch_set_bit(&switch_by_bit_value,SWITCH_WEB_FLAG,);