Question

我试图测试我们老师给我们的这个宏，并且出于某种原因我一直收到错误消息。有谁知道为什么？我似乎无法做到搞清楚。

#include <iostream>
#include <string>
#define die(errmsg) {cerr << errmsg << endl; exit(1);}
using namespace std;


int main()
{
    int x;

    for(;;)
    {
        cout <<"How are you: " <endl;
        cout <<"1) good\n"; 
        cout <<"2) bad\n";

        cin >> x;

        if(x != 1 || x != 2)
            die("Invalid input");
    }



    return(0);
}

Answer 1

cout <<"How are you: " <endl;

您在第二个<

中错过了<<

Answer 2

检查此循环：

    for(;;)
    {
        cout << "How are you: " < endl;
    }

您在<

之前错过了std::endl

    for(;;)
    {
        cout << "How are you: " << endl;
    }

定义宏n C ++的麻烦

2 个答案: