Write to text file from array list c++

Question

I have a file with 10 integers. I read the file and put it into a list. I then modify the list (add, delete, etc) and now I want to be able to save that list. So I have no idea how to take the items from my array list and save it into the file.

1) Read the file and put it into list:

ifstream intFile, floatFile;
ofstream intFileOut, floatFileOut;

SortedList<int> intList;
SortedList<float> floatList;
int a=0;
float b=0;

intFile.open("int.dat");                            
floatFile.open("float.dat");    

while(intFile>>a)
{
    intList.InsertItem(a);
    a++;
}

while(floatFile >>b)
{
    floatList.InsertItem(b);
    b++;
}

intFile.close();    
floatFile.close();

2) Modified the list

cout<<"------------------------------"<<endl;
cout<<"INT LIST: "<<endl;
cout<<"Adding 1 to list..."<<endl;
intList.InsertItem(1);
cout<<"Adding 2 to list..."<<endl;
intList.InsertItem(2);
cout<<"Deleting int 20 from the list..."<<endl;
intList.DeleteItem(20);
cout<<"------------------------------"<<endl;
cout<<"INTs in the list: "<<endl;
intList.GetNextItem(a);
cout<<"------------------------------"<<endl;
cout<<"Retriving int 30..."<<endl;
cout<<"Position of int 30: ";intList.RetrieveItem(30);cout<<endl;

3) Now I want to take the intList and save it to intFileOut, if that makes sense?

Any tips/help would be appreciated.

Btw, according to MSDN, SortedList either takes 2 template parameters (System.Collections.Generic) or none at all (System.Collections). — Jarno Argillander
– Jarno Argillander, Commented Nov 13, 2011 at 21:22
Also I would use fstream (read & write) instead of separate ifstream and ofstream objects. — Jarno Argillander
– Jarno Argillander, Commented Nov 13, 2011 at 21:24
ifstream and ofstream is the way the teacher wanted us to do it and im still getting used to reading and writing file. I just made another file to save the file. It works perfectly and thanks for the suggestion for fstream. I will look into it more. — Claud
– Claud, Commented Nov 13, 2011 at 21:31

Jarno Argillander · Accepted Answer · 2011-11-13 21:19:14Z

2

Does this work for you?
(I don't have visual C++ installed nor am I familiar with its special quirks)

for (int i = 0; i < intList.Count; i++)
{
    intFileOut << intList.GetByIndex(i) << endl;
}

answered Nov 13, 2011 at 21:19

Jarno Argillander

5,9652 gold badges36 silver badges34 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Claud Over a year ago

I used something similar to your suggestion but just made a saveFile function and it works the same way. Just outputs all of the items into the new file I created. Thank you for the help.

Collectives™ on Stack Overflow

Write to text file from array list c++

1 Answer 1

1 Comment

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

1 Comment

Your Answer

Sign up or log in

Post as a guest

Related