c++ - io流错误

Question

代码中最后两条语句有什么问题？

#include <iostream>
using namespace std;
int main()
{
cout << "2 + 4 = " << 2 + 4 << endl;
cout << "2 * 4 = " << 2 * 4 << endl;
cout << "2 | 4 = " << 2 | 4 << endl;
cout << "2 & 4 = " << 2 & 4 << endl;

我应该怎么做才能解决这个问题？

Answer 1

What is the problem with the last two statements in the code?

运算符优先级。 |和 &优先级低于 << , 所以 cout << "2 & 4 = " << 2 & 4 << endl;被解析为 (cout << "2 & 4 = " << 2) & (4 << endl;) .

What should I do to fix this?

将括号放在 2 | 4 周围和 2 & 4 .