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- #include <numeric>
- #include <ostream>
- #include <vector>
- #include <iostream>
- using namespace std;
- class Rational {
- public:
- Rational() = default;
- Rational(int numerator)
- : numerator_(numerator)
- , denominator_(1) {
- }
- Rational(int numerator, int denominator)
- : numerator_(numerator)
- , denominator_(denominator) {
- Normalize();
- }
- int Numerator() const {
- return numerator_;
- }
- int Denominator() const {
- return denominator_;
- }
- private:
- void Normalize() {
- if (denominator_ < 0) {
- numerator_ = -numerator_;
- denominator_ = -denominator_;
- }
- const int divisor = gcd(numerator_, denominator_);
- numerator_ /= divisor;
- denominator_ /= divisor;
- }
- int numerator_ = 0;
- int denominator_ = 1;
- };
- ostream& operator<<(ostream& out, Rational& value) {
- out << value.Numerator() << "/"s << value.Denominator();
- return out;
- }
- istream& operator>>(istream& in, Rational& value) {
- int numerator, denominator;
- char slash;
- in >> numerator >> slash >> denominator;
- value = Rational{ numerator, denominator };
- return in;
- }
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