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  1. import java.util.Scanner;
  2.  
  3. class Arithmetics {
  4. 	/**
  5. 	 * Returns the greatest common divisor of two numbers
  6. 	 * @param a the first number
  7. 	 * @param b the second number
  8. 	 * @return the greatest common divisor of two numbers
  9. 	*/
  10. 	public static int gcd(int a, int b)
  11. 	{
  12. 		return (b == 0 ? a : gcd(b, a % b));
  13. 	}
  14. }
  15.  
  16. class Fraction {
  17. 	private int n, d;
  18.  
  19. 	/**
  20. 	 * @param n is an integer number
  21. 	*/	
  22. 	public Fraction(int n) { setValue(n); }
  23. 	/**
  24. 	 * @param n is the numerator of a fraction
  25. 	 * @param d is the denominator of a fraction
  26. 	*/
  27. 	public Fraction(int n, int d) throws IllegalArgumentException {
  28. 		setValue(n, d);
  29. 	}
  30. 	public Fraction(Fraction f) {
  31. 		setValue(f);
  32. 	}
  33.  
  34. 	public int getNumerator() { return n; }
  35. 	public int getDenominator() { return d; }
  36.  
  37. 	public void setNumerator(int n) { setValue(n, this.d); }
  38. 	public void setDenominator(int d) { setValue(this.n, d); }
  39. 	/**
  40. 	 * Assigns a new fraction from an integer number
  41. 	*/
  42. 	public void setValue(int n) { this.n = n; this.d = 1; }
  43. 	/**
  44. 	 * Assigns a new value to the fraction
  45. 	 * @param n is the new numerator of a fraction
  46. 	 * @param d is the new denominator of a fraction
  47. 	*/
  48. 	public void setValue(int n, int d) throws IllegalArgumentException {
  49. 		if (d == 0)
  50. 			throw new IllegalArgumentException("Error: Denominator cannot be equal to zero");
  51. 		this.n = n;
  52. 		this.d = d;
  53. 		reduce();
  54. 	}
  55. 	public void setValue(Fraction f) { this.n = f.n; this.d = f.d; }
  56.  
  57. 	private void reduce() {
  58. 		int gcd = Arithmetics.gcd(n, d);
  59. 		n /= gcd;
  60. 		d /= gcd;
  61. 		if (d < 0) { d *= -1; n *= -1; }
  62. 	}
  63. 	private void add(int n, int d) {
  64. 		this.n = this.n * d + n * this.d;
  65. 		this.d *= d;
  66. 		reduce();
  67. 	}
  68. 	private void substract(int n, int d) {
  69. 		add(n * -1, d);
  70. 	}
  71. 	private void multiply(int n, int d) {
  72. 		this.n *= n;
  73. 		this.d *= d;
  74. 		reduce();
  75. 	}
  76. 	private void divide(int n, int d) {
  77. 		this.n *= d;
  78. 		this.d *= n;
  79. 		reduce();
  80. 	}
  81.  
  82. 	/**
  83. 	 * Adds an integer number to the fraction
  84. 	 * @param n is a number
  85. 	*/
  86. 	public void add(int n) {
  87. 		add(n, 1);
  88. 	}
  89. 	/** Adds another fraction to the fraction
  90. 	 * @param f is another fracton
  91. 	*/
  92. 	public void add(Fraction f) {
  93. 		add(f.n, f.d);
  94. 	}
  95.  
  96. 	/**
  97. 	 * Subsracts an integer number from the fraction
  98. 	 * @param n is a number
  99. 	*/
  100. 	public void substract(int n) { add(n * -1); }
  101. 	/** Substracts another fraction from the fraction
  102. 	 * @param f is another fracton
  103. 	*/
  104. 	public void substract(Fraction f) {
  105. 		substract(f.n, f.d);
  106. 	}
  107.  
  108. 	/**
  109. 	 * Multiplies the fraction by an integer number
  110. 	 * @param n is a number
  111. 	*/
  112. 	public void multiply(int n) {
  113. 		multiply(n, 1);
  114. 	}
  115. 	/** Multiplies the fraction by another fraction
  116. 	 * @param f is another fracton
  117. 	*/
  118. 	public void multiply(Fraction f) {
  119. 		multiply(f.n, f.d);
  120. 	}
  121.  
  122. 	/**
  123. 	 * Divides the fraction by an integer number
  124. 	 * @param n is a number
  125. 	*/
  126. 	public void divide(int n) throws ArithmeticException {
  127. 				if (n == 0) throw new ArithmeticException("Error: Division by zero");
  128. 		divide(n, 1);
  129. 	}
  130. 	/** Divides the fraction by another fraction
  131. 	 * @param f is another fracton
  132. 	*/
  133. 	public void divide(Fraction f) throws ArithmeticException {
  134. 		if (f.n == 0) throw new ArithmeticException("Error: Division by zero");
  135. 		divide(f.n, f.d);
  136. 	}
  137.  
  138. 	/**
  139. 	 * Compares the fraction to another fraction by equality
  140. 	 * @param f is another fraction
  141. 	 * @return true in case of equuality or false otherwise
  142. 	 */
  143. 	public boolean equals(Fraction f) {
  144. 		return (n == f.n && d == f.d);
  145. 	}
  146. 	/**
  147. 	 * Compares the fraction to another fraction
  148. 	 * @param f is another fraction
  149. 	 * @return 0 if the fraction equals to another fraction, 1 if greater, -1 if lesser
  150. 	 */
  151. 	public int compareTo(Fraction f) {
  152. 		return (equals(f)) ? 0 : (n * f.d - f.n * d > 0) ? 1 : -1;
  153. 	}
  154.  
  155. 	/** 
  156. 	 * String representation of the fraction
  157. 	 * @return the string representation of the fraction in such form: numerator/denominator
  158. 	 */
  159. 	public String toString() {
  160. 		return n + "/" + d;
  161. 	}
  162. }
  163.  
  164. public class Main {
  165. 	public static void main(String[] args) {
  166. 		try {
  167. 			Scanner scanner = new Scanner(System.in);
  168. 			int n1 = scanner.nextInt();
  169. 			int d1 = scanner.nextInt();
  170. 			int n2 = scanner.nextInt();
  171. 			int d2 = scanner.nextInt();
  172.  
  173. 			Fraction f1 = new Fraction(n1, d1);
  174. 			String f1Str = f1.toString();
  175. 			System.out.println("The first fraction is " + f1Str);
  176. 			Fraction f2 = new Fraction(n2, d2);
  177. 			String f2Str = f2.toString();
  178. 			System.out.println("The second fraction is " + f2Str);
  179. 			Fraction temp = new Fraction(f1);
  180.  
  181. 			int comparisonResult = f1.compareTo(f2);
  182. 			char relationSign = (comparisonResult > 0) ? '>' : (comparisonResult < 0) ? '<' : '=';
  183. 			System.out.println(f1Str + " " + relationSign + " " + f2Str);
  184.  
  185. 			temp.add(f2);
  186. 			System.out.println(f1Str + " + " + f2Str + " = " + temp.toString());
  187. 			temp.setValue(f1);
  188.  
  189. 			temp.substract(f2);
  190. 			System.out.println(f1Str + " - " + f2Str + " = " + temp.toString());
  191. 			temp.setValue(f1);
  192.  
  193. 			temp.multiply(f2);
  194. 			System.out.println(f1Str + " * " + f2Str + " = " + temp.toString());
  195. 			temp.setValue(f1);
  196.  
  197. 			try {
  198. 				temp.divide(f2);
  199. 				System.out.println(f1Str + " / " + f2Str + " = " + temp.toString());
  200. 			} catch (ArithmeticException e) {
  201. 				System.out.println(e.getMessage());
  202. 			}
  203. 		} catch (IllegalArgumentException e) {
  204. 			System.out.println(e.getMessage());
  205. 		}
  206. 	}
  207. }
Success #stdin #stdout 0.07s 4386816KB
comments (?)
stdin
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4
16
3
-5
stdout
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The first fraction is 1/4
The second fraction is -3/5
1/4 > -3/5
1/4 + -3/5 = -7/20
1/4 - -3/5 = 17/20
1/4 * -3/5 = -3/20
1/4 / -3/5 = -5/12
https://ideone.com/iBNEQn
language:
Java (HotSpot 12)
created:
7 years ago
visibility:
public

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