My C++ Loop is not working Properly, and I can't figure out why

I’m trying to write a program that copies (from an input.txt file) 30 lines to one file, then loops and copies the next 30 lines to a second file, then the next 30 to a 3rd file, etc. etc.
This is what I wrote to try and make that happen:

#include <iostream>
#include <fstream>
#include <string>

using namespace std;

int main()
{
    // initialize
    ifstream input("input.txt");
    string line;
    int i = 0;
    int fileNum = 0;
    cout << "Initialized";

    // Loop through text file and write to new files
    while (getline(input, line) && i < 30)
    {
        // Write to File
        ofstream outFile("frames/frame" + to_string(fileNum) + ".mcfunction");

        // Write Lines
        outFile << "data modify block " << (i + 1) << " -48 20 HeldItem.Item.tag.display.Name set value '{\"text\":\"" << line << "\"}'" << endl;

        // Increment Counters
        i++;
        if (i == 30)
        {
            //  Add Schedule and Scoreboard Commands to Bottom of Each File
            outFile << "scoreboard players set Frame: BadApple " + to_string(fileNum) << endl;
            outFile << "schedule frame" + to_string(fileNum + 1) + ".mcfunction 5s" << endl;

            // Reset Counter & File Number
            i = 0;
            fileNum++;
            cout << i << " ";

        }
    }

    return 0;
}

But it only ends up copying one line from the input file to each document. Everything seems to be working aside from that.

Any help would be much appreciated, I’ve been trying to debug this for a while now but as a naive beginner, I haven’t gotten very far. Thank you all in advance.

>Solution :

You keep reopening the file on every iteration of the loop. So then it keeps overwriting the first line.