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  1. /*
  2.  * Problem statement: Create a class named Fraction having two integer data members
  3.  * named for a fraction's numerator and denominator. The class' default constructor should
  4.  * provide both data members with default values of 1 if no explicit initialization is
  5.  * provided. The constructor must also prohibit a 0 denominator value. Include member
  6.  * functions for displaying an object's data values and mathematical functions capable of
  7.  * adding, subtracting, multiplying, and dividing two Fraction objects.
  8.  */
  9.  
  10.  class Fraction {
  11.  	private final int numerator;
  12.  	private final int denominator;
  13.  
  14.  	Fraction() {
  15.  		numerator = 1;
  16.  		denominator = 1;
  17.  	}
  18.  
  19.  	Fraction (int numerator, int denominator) {
  20.  		this.numerator = numerator;
  21.  		if (denominator == 0) {
  22.  			throw new IllegalArgumentException("Denominator cannot be zero.");
  23.  		} else {
  24.  			this.denominator = denominator;
  25.  		}
  26.  	}
  27.  
  28.  	public String getFraction() {
  29.  		return numerator + "/" + denominator;
  30.  	}
  31.  	public double getFractionDecimal() {
  32.  		return ((double) numerator) / denominator;
  33.  	}
  34.  
  35.  	// Mathematical functions
  36.  
  37.  	public String addFraction(Fraction otherFraction) {
  38.  		// Sum formula: a/b + c/d = (ad + cb)/bd
  39.  		int a = this.numerator;
  40.  		int b = this.denominator;
  41.  		int c = otherFraction.numerator;
  42.  		int d = otherFraction.denominator;
  43.  		return ((a*d) + (c*b)) + "/" + (b*d);
  44.  	}
  45.  
  46.  	public String subtractFraction(Fraction otherFraction) {
  47.  		// Subtraction formula: a/b - c/d = (ad - cb)/bd
  48.   		int a = this.numerator;
  49.  		int b = this.denominator;
  50.  		int c = otherFraction.numerator;
  51.  		int d = otherFraction.denominator;
  52.  		return ((a*d) - (c*b)) + "/" + (b*d);
  53.  	}
  54.  
  55.  	public String multiplyByFraction(Fraction otherFraction) {
  56.  		// Multiplication formula: a/b * c/d = ac/bd
  57.  		int a = this.numerator;
  58.  		int b = this.denominator;
  59.  		int c = otherFraction.numerator;
  60.  		int d = otherFraction.denominator;
  61.  		return (a*c) + "/" + (b*d);
  62.  	}
  63.  
  64.  	public String divideByFraction(Fraction otherFraction) {
  65.  		// Division formula: (a/b) / (c/d) = ad/bc
  66.  		int a = this.numerator;
  67.  		int b = this.denominator;
  68.  		int c = otherFraction.numerator;
  69.  		int d = otherFraction.denominator;
  70.  		return (a*d) + "/" + (b*c);
  71.  	}
  72. }
  73.  
  74. class TestFraction {
  75. 	public static void main(String[] args) {
  76. 		Fraction fraction3_4 = new Fraction(3,4);
  77. 		Fraction fraction2_3 = new Fraction(2,3);
  78.  
  79. 		System.out.println("F1: " + fraction3_4.getFraction() + " Dec: " + fraction3_4.getFractionDecimal());
  80. 		System.out.println("F2: " + fraction2_3.getFraction() + " Dec: " + fraction2_3.getFractionDecimal() + "\n");
  81. 		System.out.println("F1 + F2: " + fraction3_4.addFraction(fraction2_3));
  82. 		System.out.println("F2 + F1: " + fraction2_3.addFraction(fraction3_4) + "\n");
  83. 		System.out.println("F1 - F2: " + fraction3_4.subtractFraction(fraction2_3));
  84. 		System.out.println("F2 - F1: " + fraction2_3.subtractFraction(fraction3_4) + "\n");
  85. 		System.out.println("F1 * F2: " + fraction3_4.multiplyByFraction(fraction2_3));
  86. 		System.out.println("F2 * F1: " + fraction2_3.multiplyByFraction(fraction3_4) + "\n");
  87. 		System.out.println("F1 / F2: " + fraction3_4.divideByFraction(fraction2_3));
  88. 		System.out.println("F2 / F1: " + fraction2_3.divideByFraction(fraction3_4));
  89. 	}
  90. }
Success #stdin #stdout 0.1s 320256KB
comments (?)
stdin 
Standard input is empty
stdout 
F1: 3/4 Dec: 0.75
F2: 2/3 Dec: 0.6666666666666666

F1 + F2: 17/12
F2 + F1: 17/12

F1 - F2: 1/12
F2 - F1: -1/12

F1 * F2: 6/12
F2 * F1: 6/12

F1 / F2: 9/8
F2 / F1: 8/9
https://ideone.com/lBf83A
finished fraction operation class
language:
Java (HotSpot 12)
created:
10 years ago
visibility:
public

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