常用的位操作：置位、清零与测试

以下程序可用于把某个位置位、清零或测试某位为0还是1：

#include <stdio.h> #include <stdbool.h> int setbit(int num, int bit); int clearbit(int num, int bit); bool testbit(int num, int bit); int main(void){ int num=0x8A26; int new_num; new_num=setbit(num, 3); printf("num=%d\tnew_num=%d.\n", num, new_num); new_num=clearbit(num, 2); printf("num=%d\tnew_num=%d.\n", num, new_num); printf("%d\n",testbit(num, 2)); return 0; } int setbit(int num, int bit){ return num|=(1<<bit); } int clearbit(int num, int bit){ return num&=~(1<<bit); } bool testbit(int num, int bit){ return num&=(1<<bit); }

转载于:https://www.cnblogs.com/jinhong-lu/archive/2013/02/09/4559563.html

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