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POGenerating permutations of an int array using java -- error
 

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  1. POGenerating permutations of an int array using java -- error
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    <p>I am writing a JAVA code to generate all permutations of a integer array. Though I am getting the number of permutations right, the permutations themselves are not correct.</p> <p>On running I obtain:</p> <pre><code>Input array Length 3 1 2 3 0Permutation is 1, 2, 3, ########################## 1Permutation is 1, 3, 2, ########################## 2Permutation is 3, 1, 2, ########################## 3Permutation is 3, 2, 1, ########################## 4Permutation is 1, 2, 3, ########################## 5Permutation is 1, 3, 2, ########################## 6 number of permutations obtained BUILD SUCCESSFUL (total time: 3 seconds) public class PermulteArray { public static int counter = 0; public static void Permute(int[] input, int startindex) { int size = input.length; if (size == startindex + 1) { System.out.println(counter + "Permutation is"); for (int i = 0; i &lt; size; i++) { System.out.print(input[i] + ", "); } System.out.println(); System.out.println("##########################"); counter++; } else { for (int i = startindex; i &lt; size; i++) { int temp = input[i]; input[i] = input[startindex]; input[startindex] = temp; Permute(input, startindex + 1); } } } public static void main(String[] args) { Scanner in = new Scanner(System.in); System.out.println("Input array Length"); int arraylength = in.nextInt(); int[] input = new int[arraylength]; for (int i = 0; i &lt; arraylength; i++) { input[i] = in.nextInt(); } counter = 0; Permute(input, 0); System.out.println(counter + " number of permutations obtained"); } } </code></pre>
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    1. USManas Paldhe
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      1. POGenerating permutations of an int array using java -- error
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    1. COPlease write your expected output and actual output.
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      1. POGenerating permutations of an int array using java -- error
      1. USBhavik Ambani
    2. COWhat do you need help with? The first thing I would do is fix the format of your code and output so its easier to read. I would step through the code in your debugger to see what it doing.
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      1. POGenerating permutations of an int array using java -- error
      1. USPeter Lawrey
    3. COin the beginning I have added the obtained output for size 3, input array [1,2,3] I should get [1,2,3] [1,3,2], [2,1,3], [2,3,1], [3,1,2], [3,2,1] in any order... I am getting... 1, 2, 3, 1, 3, 2, 3, 1, 2, 3, 2, 1, 1, 2, 3, 1, 3, 2,
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      1. USManas Paldhe
 

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