L1B/main.cpp

/* CSCI 200: Lab 1B (Random Classification): Tyler Beckman
 *
 * Author: Tyler Beckman
 *
 * A program to generate a random number between user inputted bounds
 * (inclusive), and classify it by quartile. In addition, more than one random
 * number in the same range can be generated if the user wishes.
 */

#include <chrono>
#include <iostream>
#include <limits>
#include <random>

#include <cmath>

float input_float(std::string prompt) {
  float out;
  while (true) {
    std::cout << prompt + ": ";
    std::cin >> out;

    if (std::cin.fail()) {
      // The clear and ignore are necessary because otherwise it seems to
      // keep reusing the first input a person enters
      std::cin.clear();
      std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
      std::cout << "Invalid number, please make sure your number is formatted "
                   "correctly."
                << std::endl;
    } else {
      break;
    }
  }

  return out;
}

int main(void) {
  float min = input_float("Please input the minimum value"),
        max = input_float("Please input the maximum value");

  std::mt19937 mt(std::chrono::steady_clock::now().time_since_epoch().count());
  std::uniform_real_distribution<float> realDist(
      min, std::nextafter(max, std::numeric_limits<float>::max()));

  while (true) {
    float randomNumber = realDist(mt);
    std::cout << "The random value is: " << randomNumber << std::endl;

    float quartileSize = (max - min) / 4.0f;

    if (randomNumber < (min + quartileSize)) {
      std::cout << "This number is in the first quartile" << std::endl;
    } else if (randomNumber < (min + quartileSize) * 2) {
      std::cout << "This number is in the second quartile" << std::endl;
    } else if (randomNumber < (min + quartileSize) * 3) {
      std::cout << "This number is in the third quartile" << std::endl;
    } else {
      std::cout << "This number is in the fourth quartile" << std::endl;
    }

    char runAgainInput;
    std::cout << "Do you want another random value? (Y/N) ";
    std::cin >> runAgainInput;

    if (runAgainInput != 'Y' && runAgainInput != 'y') {
      std::cout << "Have a nice day!" << std::endl;
      break;
    }
  }
}