#include 
using namespace std;
#define OUTPUTLOG //在调试程序时使之成为注释行
int main()
{
int x = 1, y = 2, z = 3;
#ifndef OUTPUTLOG //本行为条件编译命令
cout << "x=" << x << ", y=" << y << ", z=" << z << "\n"; //在调试程序时需要输出这些信息
#else
cout << "no" << endl;
#endif //本行为条件编译命令
cout << "x*y*z=" << x * y * z << endl;
#if (x * y * z==6)
cout << "!0" << endl;
#elif (x * y * z==0)
cout << "ok" << endl;
#endif
}