第15周程序阅读6

#include <string>#include <iostream>#include <map>using namespace std;class CStudent{public :    int nStudentID;    int nAge;public :    CStudent()  {  }    CStudent(int nSID, int nA)    {        nStudentID=nSID;        nAge=nA;    }    //复制构造函数    CStudent(const CStudent& ob)    {        nStudentID=ob.nStudentID;        nAge=ob.nAge;    }};int main(){    map <string, CStudent> mapStudent;    mapStudent["zhangsan"] = CStudent(100012, 22);    mapStudent["Lisi"] = CStudent(100085, 21);    mapStudent["Wangwu"] = CStudent(100093, 23);    cout << "The Student number for Lisi  is " <<(mapStudent["Lisi"].nStudentID) << endl;    return 0;}

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程序分析：