Creates a random test file.

builder.cpp

/* Generates a random text file using only characters from the keyboard.
Change the i variable for shorter or longer lengths. */

#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
#include <ctime>

using namespace std;

int main(void) {
    srand(time(NULL));

    int length;
    string filename;

    cout << "Enter a file length." << endl;
    cin >> length;
    cout << "Enter a file name." << endl;
    cin >> filename;

    string allowedChars = "1234567890-=`qwertyuiop[]\\asdfghjkl;'zxcvbnm,./~!@#$%^&*()_+QWERTYUIOP{}|ASDFGHJKL:\"ZXCVBNM<>?\n";

    fstream fout(filename, fstream::out);

    if (!fout) {
      cout << "There was an error creating the file.";
      return 0;
    }

    for (int i = 0; i < length; i++) fout << allowedChars[rand() % allowedChars.length()];

    return 0;
}

Updated because it was breaking for some things.