程序代码：

#include<iostream>
#include<string>
#include<utility>
typedef pair<string,string> Author;
using namespace std;
int main ()
{
    string firstBook;
    Author proust("Marcel", "Proust");
    Author joyce("James", "joyce");
    if (Author.first == "James" && Athor.sencond == "Joyce")
        firstBook = "Stephen Hero" ;
    cout << << "The firstBook is " << firstBook << endl;
    system("pause");
}

程序代码：

#include <iostream>
#include <string>
#include <utility>
using namespace std;

typedef pair<string,string> Author;

int main()
{
    Author proust("Marcel", "Proust");
    Author joyce("James", "Joyce");

    string firstBook;
    if( joyce.first=="James" && joyce.second=="Joyce" )
        firstBook = "Stephen Hero" ;
    cout << "The firstBook is " << firstBook << endl;

    return 0;
}

程序代码：

#pragma warning(disable:4786)
#include<iostream>
#include<string>
#include<utility>
using namespace std;
typedef pair<string,string> Author;

int main ()
{
    string firstBook="";
    Author proust("Marcel", "Proust");
    Author joyce("James", "joyce");
    //你看的是c++ primer吧 307页仔细看一下 不是用Author来比较
    if (joyce.first == "James" && joyce.second == "joyce")//拼写错误
        firstBook = "Stephen Hero" ;
    cout << "The firstBook is " << firstBook << endl;
    system("pause");
    return 0;//返回0
}

#pragma warning(disable:4786)