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有理数类
1 public class Rational { 2 3 private int numerator; 4 private int denominator; 5 6 public Rational(int aNumerator, int aDenominator){ 7 int r = gcd(aDenominator, aNumerator); 8 numerator = aNumerator / r; 9 denominator = aDenominator / r; 10 sign(); 11 } 12 13 private static int gcd(int a, int b){ 14 if(b == 0){ 15 return a; 16 } 17 else{ 18 return gcd(b, a % b); 19 } 20 } 21 22 private void sign(){ 23 if(denominator < 0){ 24 numerator = -numerator; 25 denominator = -denominator; 26 } 27 } 28 29 public Rational plus(Rational b){ 30 int d = this.denominator * b.denominator; 31 int n = this.numerator * b.denominator + b.numerator * this.denominator; 32 return new Rational(n, d); 33 } 34 35 public Rational minus(Rational b){ 36 int d = this.denominator * b.denominator; 37 int n = this.numerator * b.denominator - b.numerator * this.denominator; 38 return new Rational(n, d); 39 } 40 41 public Rational times(Rational b){ 42 int d = this.denominator * b.denominator; 43 int n = this.numerator * b.numerator; 44 return new Rational(n, d); 45 } 46 47 public Rational divides(Rational b){ 48 return times(new Rational(b.denominator, b.numerator)); 49 } 50 51 public boolean equals(Object b){ 52 if(this == b)return true; 53 if(b == null)return false; 54 if(this.getClass() != b.getClass())return false; 55 56 Rational that = (Rational)b; 57 if(this.numerator == that.numerator && this.denominator == that.denominator)return true; 58 return false; 59 } 60 61 public String toString(){ 62 return this.numerator + "/" + this.denominator; 63 } 64 65 public static void main(String[] args) { 66 Rational a = new Rational(8, 30); 67 Rational b = new Rational(32, 40); 68 System.out.println("a = " + a); 69 System.out.println("b = " + b); 70 System.out.println("a + b = " + a.plus(b)); 71 System.out.println("a - b = " + a.minus(b)); 72 System.out.println("b - a = " + b.minus(a)); 73 System.out.println("a * b = " + a.times(b)); 74 System.out.println("a / b = " + a.divides(b)); 75 System.out.println("b / a = " + b.divides(a)); 76 System.out.println("a == b? " + (a.equals(b) == true? "true":"false")); 77 } 78 79 }
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