到目前为止，这是我的代码。我想对从文本文件加载的患者记录进行排序。我正在努力理解如何访问存储在结构体中的信息，以便重新排列它。例如，如何定义一个函数，将交换年龄，同时保持附加到年龄的信息（id，性别等）。

#include <iostream>
#include <cstring> // required for string manipulation
#include <iomanip> // required for tabular output
#include <fstream>

using namespace std; 
const int NUM_PATIENTS = 10; // 10 patients will be included, this value cannot be modified
const int MAX_NAME_LENGTH = 10; // no names longer than 10 characters, this value cannot be modified
const int SIZE=10;
const int SIZE2=10;
int x;
int main()
{

string category;
    do{
    cout << "Please select a sorting category"<< endl;
    cin >> category;
    if (category=="Age")
    {
        cout << "Case 1, sorting by age" << endl;
        x=1;
    }
    else if (category=="ID")
    {
        cout << "Case 2, sorting by ID" <<endl;
        x=2;
    }
    else if (category=="Sex")
    {
        cout << "Case 3, sorting by sex" << endl;
        x=3;
    }
    else if (category=="Last")
    {
        cout << "Case 4, sorting by last name"<< endl;
        x=4;
    }
    else if (category=="First")
    {
        cout << "Case 5, sorting by first name" << endl;
        x=5;
    }
    else 
    {
        cout << "invalid input" << endl;
        x=6;
    }
    }
    while (x==6);

struct records
{
    string firstName;
    string lastName;
    string sex;
    int age;
    int id;
} record [SIZE];

ifstream in ("patientInfo.txt");
if (!(in))
{
    cout << "ERROR OPENING FILE" << endl;
}
else 
{
    for (int i=0; i <SIZE; i++)
    {
        in >> record[i].age>> record[i].id>> record[i].firstName >> record[i].lastName >> record[i].sex;
    }
    for (int j=0;j<SIZE; j++)
    {
        if (x==1)
        { 
            if (record[j].age>record[j+1].age)
            {
                //rearrange
            }
        }
        if (x==2)
        {
            //sort id
        }
        if (x==3)
        {
            //sort first name 
        }
        if (x==4)
        {
            //sort lastname
        }
        if (x==5)
        {
            //sort sex
        }
    }
}

    
for (int i=0; i<1; i++)
{
    cout << record[0].age << setw(10) <<record[1].age << setw(10) << record[2].age << setw(10) << record[3].age << setw(10) << record[4].age << setw(10) << record[5].age << setw(10) << record[6].age << setw(10) << record[7].age << setw(10) << record[8].age << setw(10) << record[9].age << endl;
    cout << record[0].id << setw(10) << record[1].id << setw(10) << record[2].id << setw(10) << record[3].id<< setw(10) << record[4].id << setw(10) << record[5].id<< setw(10) << record[6].id << setw(10) << record[7].id << setw(10) << record[8].id << setw(10) << record[9].id << endl;
    cout << record[0].firstName << setw(10) << record[1].firstName << setw(10) << record[2].firstName << setw(10) << record[3].firstName<< setw(10) << record[4].firstName<< setw(10) << record[5].firstName<< setw(10) << record[6].firstName<< setw(10) << record[7].firstName << setw(10) << record[8].firstName<< setw(10) << record[9].firstName << endl;
    cout << record[0].lastName << setw(10) << record[1].lastName << setw(10) << record[2].lastName << setw(10) << record[3].lastName<< setw(10) << record[4].lastName<< setw(10) << record[5].lastName<< setw(10) << record[6].lastName<< setw(10) << record[7].lastName << setw(10) << record[8].lastName<< setw(10) << record[9].lastName << endl;
    cout << record[0].sex << setw(10) << record[1].sex << setw(10) << record[2].sex << setw(10) << record[3].sex<< setw(10) << record[4].sex<< setw(10) << record[5].sex << setw(10) << record[6].sex << setw(10) << record[7].sex << setw(10) << record[8].sex << setw(10) << record[9].sex << endl;
}

return 0;
}

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谢谢你的帮助;