main.cpp

#include <iostream>
#include <sstream>

class Rational
{
private:
  int a;
  int b;

public:
  Rational(int a, int b) : a(a), b(b)
  {
  }

  std::string toString()
  {
    std::ostringstream out;
    out << a << "/" << b;
    return out.str();
  }
};

int main()
{
  Rational num(1, 4);
  std::cout << "my number: " << num.toString() << std::endl;
}