C++的真假

• C语言没有真正的bool类型，通常用int变量来保存逻辑值
• C++使用bool类型变量来存储逻辑值，真为true,假为false
  • 有0为false，非0为true
• bool类型的特点
  • -提高程序可读性，只保存逻辑值
    -节省内存，sizeof（bool） == 1
• 示例 ```cpp

  include

  using namespace std;

int main(int argc, char const *argv[]) { bool a = false; cout << “a = “ << a << endl;

bool b = true;
cout << "b = " << b << endl;
a = (3 > 2); // true;
cout << "a = " << a << endl;
b = (3 < 2); // false
cout << "b = " << b << endl;
cout << "sizeof(bool) : " << sizeof(bool) << endl;
return 0;

} ```