could anybody help

hello everybody ,,
iam new in this forum and new in C++
so iam starting with problem here if anyone could help


i have file which is contain of name, ID ,Marks and i want to sort it ascending by the Marks
so i dont know how to move the names and Ids when i move the move the marks so could anybody help
""i think maybe if i use another array and use it as index or sth like this but i couldnt figure it out""


and this is my code

Code:

#include <iostream.h>
#include <fstream.h>

struct sort
{
	char names [20];
	long ids;
	int marks;
}result;
 main()
{
	 int temp;
sort nafek [5],index[5];
fstream  file;
file.open("data.dat",ios::in);
for (int i=0;i<3;i++)
{

file>>nafek [i].ids>>nafek[i].marks>>nafek[i].names;



}
for (i=0;i<3;i++)
{
	for (int j=i+1;j<=3;j++)
	{
		if (nafek[j].marks<nafek[i].marks)
		{
			temp=nafek[i].marks;
			nafek[i].marks=nafek[j].marks;
			nafek[j].marks=temp;
	}}
}
for (i=0;i<3;i++)
{

cout<<nafek[i].marks<<" "<< nafek[i].names<<nafek[i].ids<<'/n';
file.close();
}
	return 0;
}

and tanx