Question

我的地图和循环问题在这里。基本上我的地图是：

typedef map <int,string> studentRecord;
studentRecord sRecord;

我把键和元素放在for循环中：

for(int i = 0; i < sizephys; i++){
    phys.push_back(new physics());
    cout << "\nPlease enter student name:"<<endl;
    getline(cin , namephys);
    cout << "Please enter student id:"<<endl;
    cin >> idphys;
    cin.ignore();
    phys[i]->setNameId(namephys, idphys);
    phys[i]->addCourse(course, mark);
    sRecord[idphys] = namephys;
    }

现在的问题是我想在循环结束后使用地图进行搜索，例如：

int recordSearch;
cout << "\nPlease enter ID key of student to search their record." <<endl;
cin >> recordSearch;
searchDatabase(sRecord,recordSearch);

if (recordSearch == idphys)
{
    phys[i]->printCourseInfo();
}

由于phys [i]在循环之外，显然不会工作。有没有其他方法可以做到这一点？谢谢

void searchDatabase(studentRecord &sRecord, int recordSearch)
{
   studentRecord::iterator studRecordIter;
   studRecordIter = sRecord.find(recordSearch);
   if(studRecordIter != sRecord.end()) 
    cout<<"\nFound record for student " <<
    recordSearch << " = "<<
    studRecordIter->second<<endl;
   else
    cout<<"Sorry, record " << recordSearch << 
    " is not in database"<<endl;
}

Answer 1

为什么你首先使用矢量（或任何pys）？无论如何，替换这一行：

sRecord[idphys] = namephys;

与

sRecord[idphys] = phys[i];

和

typedef map <int,string> studentRecord;

与

typedef map <int, physic *> studentRecord;

应该做的伎俩。

（另请注意，您没有给出矢量类型，因此可能会有一些调整）

Map和For循环

1 个答案: