C Random String Generator (Using Boost.Random)

Code
#include <iostream>

#include <fstream>

#include <vector>

#include "boost/random.hpp"

#include "boost/generator_iterator.hpp"



std::vector<int> getRandom(int n, int l, int floor, int ceiling)

{

    std::vector<int> numbers;



    typedef boost::mt19937 RNGtype; //defining as RNGtype to clean up code below

    RNGtype RNG(time(0)); //setting seed



    boost::uniform_int<> range (floor, ceiling); //range of possible numbers

    boost::variate_generator< RNGtype, boost::uniform_int<> > gen(RNG, range); // 'gen' generates the random number using my defined RNGtype



    for (int i = 0; i < (n * l); i++)

    {

        numbers.push_back(gen()); //storing random numbers in a vector that will be returned to main

    }



    return numbers;

}



void writeToFile(int n, int l, std::vector<char> randomChars)

{

    std::ofstream ofile;

    ofile.open("output.txt");



    for (int i = 0; i < (n * l); i++)

    {

        if (i % l == 0 && i != 0) ofile << "\n";

        ofile << randomChars[i];

    }

    ofile.close();

}



int main()

{

    const char chars [62] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',

    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',

    '0', '1', '2', '3', '4', '5', '6', '7', '8', '9' };



    int n, l, floor, ceiling; // 'n' = number of strings, 'l' = length of each string



    std::cout << "How many strings do you want to generate?\n";

    std::cin >> n;



    std::cout << "\nHow many characters in each string?\n";

    std::cin >> l;



    std::cout << "\nWhat characters to include?\n"

              << "[01] All (A-Z, a-z, 0-9)\n"

              << "[02] Uppercase and Lowercase (A-Z, a-z)\n"

              << "[03] Uppercase only (A-Z)\n"

              << "[04] Lowercase only (a-z)\n"

              << "[05] Numbers only (0-9)\n";



    int * choice = new int();

    std::cin >> *choice;

    switch (*choice)

    {

        case 1: floor = 0; ceiling = 61;

        break;

        case 2: floor = 0; ceiling = 51;

        break;

        case 3: floor = 26; ceiling = 51;

        break;

        case 4: floor = 0; ceiling = 25;

        break;

        case 5: floor = 52; ceiling = 61;

        break;

        default: floor = -1;

    }

    delete choice;



    if (floor != -1)

    {

        std::vector<int> randomNumbers = getRandom(n, l, floor, ceiling); //retrieves random numbers and stores them in 'randomNumbers'

        std::vector<char> randomChars;



        for (int i = 0; i < (n * l); i++) //uses values from 'randomNumbers' and 'chars' to generate/store random characters in 'randomChars'

        {

            randomChars.push_back(chars[randomNumbers[i]]);

        }



        for (int i = 0; i < (n * l); i++) //prints the values stored in 'randomChars' to the console

        {

            if (i % l == 0) std::cout << "\n";



            std::cout << randomChars[i];



        }



        std::cout << "\n\nDo you want to save the strings to a text file?\n"

                  << "[01] Yes\n"

                  << "[02] No\n";



        int * choiceFile = new int();

        std::cin >> *choiceFile;



        if (*choiceFile == 1)

        {

            writeToFile(n, l, randomChars);

            std::cout << "\nSaved to 'output.txt'\n" << "Exiting\n";

        }

        else std::cout << "\nExiting\n";



        delete choiceFile;



    }

    else std::cout << "Invalid input";



}