// 实现对一个8bit数据（unsigned char 类型）的指定位（例如第n位）置0或者置1操作，，并保持其他位不变#include <stdio.h>void bit_set(unsigned char *p_data, unsigned char position, int flag){unsigned c;unsigned char a = 1;a = a << (position – 1);if (flag == 1){*p_data = *p_data | a;}else{c = ~a;*p_data = *p_data & c;}}int main(){int pos;int flag;unsigned char P_data;printf("please enter the number:");scanf("%d", &P_data);printf("please enter the position:");scanf("%d", &pos);printf("please enter the flag(0 or 1):");scanf("%d", &flag);bit_set(&P_data, pos, flag);printf("the number is %d\n", P_data);return 0;}<img src="?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQvemhhb3lhcWlhbjU1Mg==/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center" alt="" />
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