C语言 简单位操作

#include

void set_1(int *var,int i)     //置1
{
 *var |=(1< }

void set_0(int *var,int i)    //置0
{
 *var &=~(1< }

void invert(int *var)        //反转
{
 int i,temp=0x01;
 for(i=0;i<8;i++)
 {
  if(temp & *var)
   *var &=~(1<       else
   *var |=(1<    temp<<=1;
 }
}

int get_bit(int *var,int i)     //获取某一位
{
 return (*var & (0x01<}

int main()
{
int a=0x9b;           //1001 1011
printf("%d\n",a);

set_1(&a,6);
printf("%d\n",a);    //1101 1011 

set_0(&a,6);
printf("%d\n",a);    //1001 1011

invert(&a);          //0110 0100
printf("%d\n",a);

printf("the 4st bit is %d\n",get_bit(&a,4));
}