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rikesh_kisnah on 05/16/14

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# Find Pairs of Numbers

/ Published in: Java

Write a code that will find the sum of any pairs of numbers

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1. import java.io.*;
2. import java.util.*;
3.
4. public class FindPair
5. {
6. public static Vector<MyPair> v = new Vector<MyPair> ();
7. public static void main (String args[])
8. {
9. // System.out.println ("Hello world");
10.
11. int target = -1;
12. if (args.length != 0)
13. {
14. target = Integer.parseInt(args[0]);
15. }
16. else
17. {
18. target = 5;
19. }
20. Iterator it = v.iterator();
21.
22.
23. //int []array = {0,1,2,3,4,5};
24. int []array = new int[100];
25. int size = PopulateArrayFromFile(array);
26. PopulateArrayFromFile(array);
27. // for(int x=0; x < size; x++)
28. // {
29. //System.out.print (array[x]+ "... ");
30. // }
31.
32. FindPairs(array,size, target);
33.
34. // System.out.println ("Size: " + v.size());
35.
36. Enumeration e = v.elements();
37. System.out.print("Array elements:");
38.
39. for(int n=0; n < size;n++ )
40. {
41. System.out.print (array[n]+ " ");
42. }
43. System.out.println();
44.
45. System.out.println ("target: " + target);
46.
47. while (e.hasMoreElements())
48. {
49. MyPair p = (MyPair)e.nextElement();
50. System.out.println ("x: " + p.x + " y: " + p.y);
51. }
52.
53. }
54.
55. public static int PopulateArrayFromFile (int []arr)
56. {
57. int size = -1;
58. try
59. {
61. String l;
62. Vector <String> vFileContents = new Vector<String>();
63. while ((l = br.readLine())!= null)
64. {
65. // System.out.println ("l: " + l);
67. }
68.
69. size = vFileContents.size();
70.
71. int count = 0;
72. for (String x:vFileContents)
73. {
74. // System.out.println ("x: " + x);
75. arr[count] = Integer.parseInt (x);
76. // System.out.println ("arr: " + arr[count]);
77. count++;
78. }
79. //System.out.println ("here size: " + arr.length);
80.
81. // for (int n=0; n < size; n++)
82. // {
83. // System.out.println ("here2: " + arr[n]);
84. // }
85. }catch (IOException io)
86. {
87. io.printStackTrace ();
88. }
89. return size;
90. }
91.
92. public static void FindPairs(int []array, int size, int target)
93. {
94. for (int i =0; i < size; i++)
95. {
96. for (int j = 1; j < size; j++)
97. {
98. int sum = array[i] + array[j];
99.
100. if (sum == target)
101. {
102. //System.out.println ("Adding elem: " + array[i] + " " + array[j]);
104. }
105. }
106. }
107. }
108.
109. }
110.
111.
112. class MyPair
113. {
114. int x = 0;
115. int y = 0;
116. public MyPair (int x, int y)
117. {
118. this.x = x;
119. this.y = y;
120. }
121. }