<pre name="code" class="cpp">
方法一
#include<stdio.h>#include<math.h>void bit_set(unsigned char *p_date, unsigned char position, int flag){char a =(char) pow(2, (position - 1)); //指数 2^(position - 1)if (flag == 1){*p_date |= a;//0000 0010或0000 0001 |表示按位或} // 0000 0011else {*p_date &= ~a; //0000 0010&1111 1110 ~表示按位取反} // 0000 0010 &表示按位与}int main(){unsigned char val = 2;bit_set(&val, 1, 0);printf("%d\n", val);getchar();return 0;}#inclu
