main.cpp

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

// chars for password generation
const char alphanum[] = "0123456789!@#$%^&*abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
// string length variable
int string_length = sizeof(alphanum)-1;

// max and minimum password length
void pswd_max_length(int(n), int(low))
{
    if (n < low)
    {
        std::cout << "Number cannot be smaller than 6 letters!\n\n" << std::endl;
        exit(0);
    } else if (n > 100)
    {
        std::cout << "You cannot generate a password longer than 100 letters!\n\n" << std::endl;
        exit(0);
    }   
}

// check if entry was valid
void valid_entry(int(repeat))
{
    if (repeat <= int(0))
    {
        std::cout << "You cannot generate 0 or negative numbers. Generating 1 password instead.\n";
        repeat = 1;
    }
    
}

int main()
{
    int n; // password length
    int repeat; // variable for generating multiple passwords
    int low = 6; // variable for how small the password can be (6)
    int option;

    std::cout << "\n[How many passwords would you like to generate]:> ";
    std::cin >> repeat; // input amount of passwords to generate

    valid_entry(repeat); // check if repeat was above 0

    std::cout << "[Enter the length of password]:> ";
    std::cin >> n; // input password length

    pswd_max_length(n, low); // Check if the password is too long or too short

    srand(time(0)); // Seed (unpredictable seed) time(0) makes sure every password generated is unique
 
    std::cout << "Generated passwords: \n" << std::endl;

    for(int i = 0; i < repeat; i++) // for loop to generate passwords
    {   
        for (int i = 0; i < n; i++)
        {   
            std::cout << alphanum[rand() % string_length]; // variable for password generated
        }

        std::cout << "\n";
    }

    std::cout << "" << std::endl;

    return 0;
}