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  1. package fracCalc;
  2.  
  3. import java.util.Scanner;
  4.  
  5. public class fraction {
  6.  
  7. 	public static void main(String[] args) {
  8. 		Scanner scanner = new Scanner(System.in);
  9.  
  10. 		System.out.print("Enter a fraction: ");
  11. 		String input = scanner.nextLine();
  12.  
  13. 		// loop until user enters 'quit'
  14. 		while (!input.equalsIgnoreCase("quit")) {
  15. 			System.out.println(produceAnswer(input));
  16. 			System.out.print("Enter a fraction: ");
  17. 			input = scanner.nextLine();
  18. 		}
  19.  
  20. 		System.out.println("Goodbye!");
  21. 		scanner.close();
  22.  
  23. 	}
  24.  
  25. 	private static String produceAnswer(String input) {
  26.  
  27. 		// parse input
  28. 		String t[] = input.split(" ");
  29. 		if (t.length != 3) return "Check format!";
  30. 		MixedFraction a = parseFraction(t[0]);
  31. 		a.check();
  32. 		String operator = t[1];
  33. 		MixedFraction b = parseFraction(t[2]);
  34. 		b.check();
  35.  
  36. 		MixedFraction result;
  37.  
  38. 		//addition
  39. 		switch(operator) {
  40. 			case "+":
  41. 				result = a.add(b);
  42. 				break;
  43. 			case "-":
  44. 				result = a.subtract(b);
  45. 				break;
  46. 			case "*":
  47. 				result = a.multiply(b);
  48. 				break;
  49. 			case "/":
  50. 				result = a.divide(b);
  51. 				break;
  52. 			default:
  53. 				return a + " " + operator + " " + b + " = " + result;
  54. 		}
  55.  
  56. 	}
  57.  //parse
  58. 	private static MixedFraction parseFraction(String fraction) {
  59.  
  60. 		MixedFraction mf = new MixedFraction();
  61.  
  62. 		String[] t;
  63. 		if (fraction.contains("_")) {
  64. 			t = fraction.split("_");
  65. 			mf.number = Integer.parseInt(t[0]);
  66. 			fraction = t[1];
  67. 		}
  68. 		else mf.number = 0;
  69.  
  70. 		t = fraction.split("/");
  71. 		mf.num = Integer.parseInt(t[0]);
  72. 		mf.denom = Integer.parseInt(t[1]);
  73. 		return mf;
  74. 	}
  75.  
  76. }
  77.  
  78. class MixedFraction {
  79. 	public int number, num, denom;
  80.  
  81. 	public MixedFraction() {
  82. 		number = 0;
  83. 		num = 0;
  84. 		denom = 0;
  85. 	}
  86.  
  87. 	private int gcd(int a, int b) {
  88. 		while (b != 0) {
  89. 			int t = b;
  90. 			b = a % b;
  91. 			a = t;
  92. 		}
  93. 		return a;
  94. 	}
  95.  
  96. 	private int lcm(int a, int b) {
  97. 		return Math.abs(a * b) / gcd(a, b);
  98. 	}
  99.  
  100. 	public void check() {
  101. 		if (this.num <= this.denom) return;
  102. 		this.number += this.num / this.denom;
  103. 		this.num = this.num % this.denom;
  104. 	}
  105. 	public String toString() {
  106. 		return (number != 0 ? number + "_" : "") + num + "/" + denom;
  107. 	}
  108.  //adding the fractions
  109. 	public MixedFraction add(MixedFraction b) {
  110. 		MixedFraction mf = new MixedFraction();
  111. 		int a_num = this.num + this.number * this.denom;
  112. 		int b_num = b.num + b.number * b.denom;
  113. 		int lcm = lcm(this.denom, b.denom);
  114. 		a_num *= lcm / this.denom;
  115. 		b_num *= lcm / b.denom;
  116. 		mf.num = a_num + b_num;
  117. 		mf.denom = lcm;
  118. 		mf.check();
  119. 		return mf;
  120. 	}
  121.  
  122. 	//multiply the fractions
  123. 	public MixedFraction multiply(MixedFraction b) {
  124. 		MixedFraction mf = new MixedFraction();
  125. 		int a_num = this.num * this.number * this.denom;
  126. 		int b_num = b.num * b.number * b.denom;
  127. 		int lcm = lcm(this.denom, b.denom);
  128. 		a_num *= lcm / this.denom;
  129. 		b_num *= lcm / b.denom;
  130. 		mf.num = a_num * b_num;
  131. 		mf.denom = lcm;
  132. 		mf.check();
  133. 		return mf;
  134. 	}
  135.  
  136. 	//subtract the fractions
  137. 	public MixedFraction subtract(MixedFraction b) {
  138. 		MixedFraction mf = new MixedFraction();
  139. 		int a_num = this.num - this.number * this.denom;
  140. 		int b_num = b.num - b.number - b.denom;
  141. 		int lcm = lcm(this.denom, b.denom);
  142. 		a_num *= lcm / this.denom;
  143. 		b_num *= lcm / b.denom;
  144. 		mf.num = a_num - b_num;
  145. 		mf.denom = lcm;
  146. 		mf.check();
  147. 		return mf;
  148. 	}
  149. 	//divide the fractions
  150. 	public MixedFraction divide(MixedFraction b) {
  151. 		MixedFraction mf = new MixedFraction();
  152. 		int a_num = this.num - this.number * this.denom;
  153. 		int b_num = b.num / b.number / b.denom;
  154. 		int lcm = lcm(this.denom, b.denom);
  155. 		a_num *= lcm / this.denom;
  156. 		b_num *= lcm / b.denom;
  157. 		mf.num = a_num / b_num;
  158. 		mf.denom = lcm;
  159. 		mf.check();
  160. 		return mf;
  161. }
  162. }
Compilation error #stdin compilation error #stdout 0s 0KB
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stdin
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Standard input is empty
compilation info 
Main.java:5: error: class fraction is public, should be declared in a file named fraction.java
public class fraction {
       ^
1 error
stdout
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Standard output is empty
https://ideone.com/KXpx9H
language:
Java (HotSpot 12)
created:
11 years ago
visibility:
public

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