让我感到沮丧的代码如下：
- bool a = 0x00000FF0 & 0x00000FF0 == 0x00000FF0;
- if (a) {
- Serial.println("True");
- } else {
- Serial.println("False");
- }
这打印“假”.我真的不明白为什么.
更多测试：
- bool a = 0x00000FF0 & 0x00000FF0 == 0x00000FF0;
- Serial.println(a);
打印0.
和：
- unsigned long a = 0x00000FF0 & 0x00000FF0;
- Serial.println(a,HEX);
打印FF0.
解决方法
运算符优先级,编译时带有警告：
- warning: suggest parentheses around comparison in operand of ‘&’ [-Wparentheses]
改成
- bool a = (0x00000FF0 & 0x00000FF0) == 0x00000FF0;
