C++工作笔记-对"|"，"&"这些位运算的进一步认识

程序运行截图如下：

源码如下：

#include <cstdio>

#define A 0x00000001
#define B 0x00000100
#define C 0x00010000
#define D 0x01000000

#define E 0x00000001

#define AorB A&B

void main() {

	int valueA = AorB;
	printf("valueA is 0x%08x\n", valueA);

	int valueB = A | B;
	printf("valueB is 0x%08x\n", valueB);

	int valueC = B | C | D;
	printf("valueC is 0x%08x\n", valueC);

	int valueD = A | C | D;
	printf("valueD is 0x%08x\n", valueD);

	if (valueA&E) {
		printf("valueA&E is successful!\n");
	}
	else {
		printf("valueA&E is failed!\n");
	}

	if (valueB&E) {
		printf("valueB&E is successful!\n");
	}
	else {
		printf("valueB&E is failed!\n");
	}

	if (valueC&E) {
		printf("valueC&E is successful!\n");
	}
	else {
		printf("valueC&E is failed!\n");
	}

	if (valueD&E) {
		printf("valueD&E is successful!\n");
	}
	else {
		printf("valueD&E is failed!\n");
	}

	getchar();
}

 

总结：一般用于带有status或flag这些地方，比如一个窗口包含了3种状态（这时候可以用'|"），当想判断这一群状态里面是否还有某一状态时这个时候就可以用“&”