c++ - Sorting files problem

[Kathy]

I am trying to sort a record according to their respective number like this:

5 reyes d r 1 2 3
3 delos d k 4 5 6
9 go t r 7 4 5
1 po w w 2 2 2
2 bun b m 3 3 3

then it will become:

1 po w w 2 2 2
2 bun b m 3 3 3
3 delos d k 4 5 6
5 reyes d r 1 2 3
9 go t r 7 4 5

here is the definition of the code:

void sortRec()
{
	fstream data,temp;
	string line;
	int size(0);
	int id[500];

	data.open("employee.txt",ios_base::in);

	//counting lines
	data.seekg(0,ios::beg);
	while(getline(data,line))
			{size++;}

	data.clear();
	data.seekg(0,ios::beg);
	for(int i=0;i<size;i++)
	{
		data>>id[i]>>e.name.lname>>e.name.fname>>e.name.mname>>e.address>>e.hour>>e.hRate;
	}
	//sorting employee numbers
	for(int a=0;a<size;a++)
	{
		for(int b=a+1;b<size;b++)
		{
			if(id[b]<id[a])
			{
				int tmp;
				tmp=id[a];
				id[a]=id[b];
				id[b]=tmp;
			}
		}
	}

	data.close();

	//sorting the data
	rename("employee.txt","tempfile.txt");

	data.open("employee.txt",ios_base::app);
	temp.open("tempfile.txt",ios_base::in);

	int _id;
	for(int i=0;i<size;i++)
		{
			temp>>_id;
			temp>>e.name.lname>>e.name.fname>>e.name.mname>>e.address>>e.hour>>e.hRate;
			for(int a=0;a<size;a++)
				{
					if(id[a]==_id)
					{data<<_id<<" "<<e.name.lname<<" "<<e.name.fname<<" "<<e.name.mname<<" "<<e.address<<" "<<e.hour<<" "<<e.hRate<<'\n';}

			}
	}

	data.close();
    temp.close();
	
    remove("tempfile.txt");
}

what i did is i get the E numbers of every record first then i sort them. then i open the file again and get the E numbers to compare to the sorted one then write it to the file.

but what happen is, it didn't sort, the files on the record remains the same :

5 reyes d r 1 2 3
3 delos d k 4 5 6
9 go t r 7 4 5
1 po w w 2 2 2
2 bun b m 3 3 3

Do anyone knows where in my code go wrong?

[NVTKrishna]

1) then i open the file again

You are opened the file in append mode, so original content present in the file (it was not written by your code)

data.open("employee.txt",ios_base::app);

2) Your way of sorting is correct

3) Writing the sorted information to the file was problem

Replace the following code

        int _id;
	for(int i=0;i<size;i++)
		{
			temp>>_id;
			temp>>e.name.lname>>e.name.fname>>e.name.mname>>e.address>>e.hour>>e.hRate;
			for(int a=0;a<size;a++)
				{
					if(id[a]==_id)
					{data<<_id<<" "<<e.name.lname<<" "<<e.name.fname<<" "<<e.name.mname<<" "<<e.address<<" "<<e.hour<<" "<<e.hRate<<'\n';}

			}
	}

with

       int _id;
	for(int i=0;i<size;i++)//for iterating id
	{			
		for(int a=0;a<size;a++)
		{
			temp>>_id;
			temp>>e.name.lname>>e.name.fname>>e.name.mname>>e.address>>e.hour>>e.hRate;
			if(id[i]==_id)
			{
				{data<<_id<<" "<<e.name.lname<<" "<<e.name.fname<<" "<<e.name.mname<<" "<<e.address<<" "<<e.hour<<" "<<e.hRate<<'\n';}
				break;
			}
		}
	}

[Kathy]

thanks ^^