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java_844xOB.java

public class HelloWorld {
  public static void main(String[] args) {
    Rational a = new Rational(1, 6);
    Rational b = new Rational(1, 3);
    a.add(b);
    a.output();
  }
}


class Rational
{
  private int numerator;
  private int denominator;

  Rational(int a, int b) {
    this.numerator = a;
    this.denominator = b;
  }
  
  Rational() {
    this.numerator = 1;
    this.denominator = 1;
  }
  
  void add(Rational r) {
    int mother = lcm(this.denominator, r.denominator);
    int son = this.numerator * (mother / this.denominator) + r.numerator * (mother / r.denominator);
    
    this.numerator = son;
    this.denominator = mother;
    this.simplify();
  }
  void product(Rational r) {
    int son = this.numerator * r.numerator;
    int mother = this.denominator * r.denominator;
    
    this.numerator = son;
    this.denominator = mother;
    this.simplify();
  }
  void divide(Rational r) {
    int son = this.numerator * r.denominator;
    int mother = this.denominator * r.numerator;
    
    this.numerator = son;
    this.denominator = mother;
    this.simplify();
  }
  void substract(Rational r) {
    int mother = lcm(this.denominator, r.denominator);
    int son = this.numerator * (mother / this.denominator) - r.numerator * (mother / r.denominator);

    this.numerator = son;
    this.denominator = mother;
    this.simplify();
  }
  void simplify() {
    int gcd = gcd(this.numerator, this.denominator);
    this.numerator /= gcd;
    this.denominator /= gcd;
  }

  void output() {
    System.out.printf("%d/%d", this.numerator, this.denominator);
  }
  
  int gcd(int a, int b) {
    if ( b > a ) {
      int temp = b;
      b = a;
      a = temp;
    }

    int mod = a % b;
    if (mod == 0) {
      return b;
    } else {
      return gcd(b, mod);
    }
  }
  
  int lcm(int a, int b) {
    return a * b / gcd(a, b);
  }
}