cppFractionBaseSimple

#include <iostream>

class Fraction
{
    int numerator;
    int denominator;
    int gcd(int a, int b);
    void reduce();
public:
    void setNumerator(int num) { numerator = num; reduce(); };
    int getNumerator() const { return numerator; };
    void setDenominator(int denom) { denominator = denom ? denom : 1; reduce(); };
    int getDenominator() const { return denominator; };
    void set(int num, int denom) { numerator = num; denominator = denom ? denom : 1; reduce();}
    void print() const;
    Fraction add(const Fraction& fract);
    Fraction sub(const Fraction& fract);
    Fraction mul(const Fraction& fract);
    Fraction div(const Fraction& fract);

};

int Fraction::gcd(int a, int b)
{
    while (b)
    {
        a %= b;
        std::swap(a, b);
    }
    return a;
}

void Fraction::reduce()
{
    int gcdVal{ gcd(numerator, denominator) };
    numerator /= gcdVal;
    denominator /= gcdVal;

    if (denominator < 0 and numerator < 0)
    {
        denominator *= -1;
        numerator *= -1;
    }
}

Fraction Fraction::add(const Fraction& fract)
{
    Fraction result;
    result.set(numerator * fract.denominator + fract.numerator * denominator, denominator * fract.denominator);
    return result;
}

Fraction Fraction::sub(const Fraction& fract)
{
    Fraction result;
    result.set(numerator * fract.denominator - fract.numerator * denominator, denominator * fract.denominator);
    return result;
}

Fraction Fraction::mul(const Fraction& fract)
{
    Fraction result;
    result.set(numerator * fract.numerator, denominator * fract.denominator);
    return result;
}

Fraction Fraction::div(const Fraction& fract)
{
    Fraction result;
    result.set(numerator * fract.denominator, denominator * fract.numerator);
    return result;
}

void Fraction::print() const
{
    std::cout << '(' << numerator << " / " << denominator << ")";
}

int main()
{
    Fraction a;
    Fraction b;

    a.set(1,2);
    b.set(1,3);

    std::cout << "a = "; a.print(); std::cout << " b = "; b.print(); std::cout << '\n';
    std::cout << "a + b = "; a.add(b).print(); std::cout << '\n';
    std::cout << "a - b = "; a.sub(b).print(); std::cout << '\n';
    std::cout << "a * b = "; a.mul(b).print(); std::cout << '\n';
    std::cout << "a / b = "; a.div(b).print(); std::cout << '\n';

    return 0;
}