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  1. import java.lang.*;
  2.  
  3. class Rational {
  4.     private  int n, d;
  5.  
  6.     public Rational (int n, int d)  throws ArithmeticException {
  7.         if (d == 0) throw new ArithmeticException("wrong ");
  8.         int divisor = gcd(n,d);
  9.         this.n = n/divisor;
  10.         this.d = d/divisor;
  11.     }
  12.  
  13.     private static int gcd(int n, int d) {
  14.         return ( d == 0 ? n: gcd(d, n%d));
  15.     }
  16.  
  17.     public static boolean equals(Rational x, Rational y) {
  18.         if ( x.n != y.n || x.d != y.d) return false;
  19.         else return true;
  20.     }
  21.  
  22.     public static Rational add(Rational x, Rational y) {
  23.         return new Rational(x.n * y.d + y.n * x.d, x.d * y. d);
  24.     }
  25.  
  26.     public static Rational sub(Rational x, Rational y) {
  27.         return new Rational(x.n * y.d - y.n * x.d, x.d * y. d);
  28.     }
  29.  
  30.     public static Rational mul(Rational x, Rational y) {
  31.         return new Rational(x.n * y.n, x.d * y.d);
  32.     }
  33.  
  34.     public static Rational div(Rational x, Rational y) {
  35.         return new Rational(x.n * y.d, x.d * y.n);
  36.     }
  37.  
  38.     public String toString() {
  39.         return n + "/" + d;
  40.     }
  41.  
  42.     public static void cmp(Rational x, Rational y) {
  43.         if ( ! equals(x,y)) {
  44.             if ( (x.n * y.d ) > (y.n * x.d)) System.out.println( x.toString() + " > " + y.toString());
  45.             else System.out.println( y.toString() + " > " + x.toString());
  46.         }
  47.         else System.out.println( x.toString() + " = " + y.toString());
  48.     }
  49.  
  50.     public static void main(String[] args) {
  51.         try {
  52.             Rational a = new Rational(4, 5);
  53.             Rational b = new Rational(1, 2);
  54.             Rational c = new Rational(2, 5);
  55.             System.out.println("Equality - " + equals(a, b));
  56.             System.out.println("Equality - " + equals(mul(a,b), c));
  57.             System.out.println(c.toString() + "+" + b.toString() + "=" + add(c, b));
  58.             System.out.println(a.toString() + "-" + b.toString() + "=" + sub(a, b));
  59.             System.out.println(b.toString() + "-" + a.toString() + "=" + sub(b, a));
  60.             System.out.println(c.toString() + "*" + b.toString() + "=" + mul(c, b));
  61.             System.out.println(a.toString() + "%" + b.toString() + "=" + div(a, b));
  62.             cmp(a,b);
  63.             cmp(b,c);
  64.             cmp(mul(a,b), c);
  65.         }
  66.         catch (ArithmeticException e) {
  67.             System.out.println("dividing on 0");
  68.         }
  69.     }
  70. }
Success #stdin #stdout 0.04s 711168KB
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stdin
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Standard input is empty
stdout
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Equality - false
Equality - true
2/5+1/2=9/10
4/5-1/2=3/10
1/2-4/5=-3/10
2/5*1/2=1/5
4/5%1/2=8/5
4/5 > 1/2
1/2 > 2/5
2/5 = 2/5
https://ideone.com/kLPWYa
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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