Q:

Java program to find missing elements in array elements

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mahmoud2506
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2022-05-07
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Given an array of integers (in a series) and we have to find its missing elements (there will be a missing element) using java program.

Example:

    Input array: 1, 2, 3, 4, 6, 7
    Output:
    Missing element is: 5

 

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mahmoud2506
2022-05-07
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Program to find missing element in an array in java

public class ExArrayMissing {
  public static void main(String[] args) {
    // initialize here.
    int n;

    // take default input array.
    int[] numbers = new int[] {
      1,
      2,
      3,
      4,
      6,
      7
    };

    // last elements.
    n = 7;

    // sum of elements till last value.
    int expected_sum = n * ((n + 1) / 2);
    int sum = 0;

    for (int i: numbers) {
      sum += i;
    }

    // obtain missing elements.
    int m = expected_sum - sum;
    System.out.print("Missing element is : " + m);
    System.out.print("\n");
  }
}

Output

    Missing element is : 5

 

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