algo-1 created by ukoloff - https://repl.it/@ukoloff/algo-1

main.cpp

#include <iostream>
#include <cmath>

int main() {
  std::cout << "Введите два числа:";
  int a, b;
  std::cin >> a >> b;

  std::cout << a << " + " << b << " = " << a + b << std::endl;
  std::cout << a << " - " << b << " = " << a - b << std::endl;
  std::cout << a << " * " << b << " = " << a * b << std::endl;
  std::cout << a << " / " << b << " = " << a / 1.0 / b << std::endl;

  std::cout << "Max = " << (a > b ? a : b) << std::endl;
  std::cout << "Min = " << (a > b ? b : a) << std::endl;

  int D = a * a - 4 * b;
  if (D < 0) {
    std::cout << "Нет корней" << std::endl;
  } else if (0 == D) {
    std::cout << "Один корень: " << -a / 2.0 << std::endl;
  } else {
    std::cout << "Два корня: " <<
      (-a + sqrt(D)) / 2 << " и " <<
      (-a - sqrt(D)) / 2 << std::endl;
  }
}