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* 取反运算符为：~
* 功能：参加运算的一个数据，按二进制位进行“取反”运算。
* 运算规则：~ 1 = 0，~ 0 = 1。即：对一个二进制数按位取反，将0变1，1变0。
* 使一个数的最低位为零，可以表示为：a&~1。
~1的值为1111111111111110，再按“与”运算，最低位一定为0。因为“~”运算符的优先级比算术运算符、关系运算符、逻辑运算符和其他运算符都高。
「非运算符」：
在C++中，取反运算符用!表示，也叫逻辑非运算符。它的作用是将所操作的值反转，即将true转换为false，将false转换为true。
逻辑非运算符只适用于逻辑（布尔）类型的运算符，并且只有一个操作数。如果该操作数为零，则返回true，否则返回false。
以下是一个示例代码：
#include <iostream> using namespace std; int main() { bool a = true; bool b =
false; cout << "a is " << (!a) << endl; // 输出 false cout << "b is " << (!b) <<
endl; // 输出 true return 0; }
在上面的代码中，首先定义了两个逻辑类型的变量a和b，分别为true和false。然后使用逻辑非运算符对这两个量进行取反，将取反后的值输出到控制台。
需要注意的是，逻辑非运算符具有较高的优先级，因此需要在表达式中使用括号以避免优先级问题。例如，!a && b可以表示为(!a) &&
b，因为逻辑非运算符的优先级要高于逻辑与运算符。
