Question

[Error] expected unqualified-id before 'xor' token/expected primary-expression before 'xor'token？

以下是源代码：
#include <iostream>
using namespace std;

bool xor(bool a,bool b);

int main()
{
bool p,q;
cin >> p;
cin >> q;
cout << (p && q)<<'\n';
cout << (p || q)<<'\n';
cout << xor(p,q)<<'\n';

return 0;
}

bool xor(bool a,bool b)
{
return (a||b)&&!(a&&b);
}
错误：
4 6 E:\C Programe\c++ j-j\3.5.3.cpp [Error] expected unqualified-id before 'xor' token。
E:\C Programe\c++ j-j\3.5.3.cpp In function 'int main()':
13 10 E:\C Programe\c++ j-j\3.5.3.cpp [Error] expected primary-expression before 'xor' token
E:\C Programe\c++ j-j\3.5.3.cpp At global scope:
19 6 E:\C Programe\c++ j-j\3.5.3.cpp [Error] expected unqualified-id before 'xor' token

Answer 1

xor是c++关键词，不能用作变量名和函数名
其他关键词见 http://en.cppreference.com/w/cpp/keyword