Shortest Way to Find Missing Element in Array in JAVA

Write a program to find missing element in Array

How to find Missing Element

• Create an Array int[]arr=new int[6] //array size 6 but you can change
• Find expected length of an array
• Find value (sum is variable) of sum by this : expected*(expected+1)/2;
• create variable add put value in add = 0;
• using for loop traverse the array and assign value into add variable : add=add+array[i];
• finally print value of an array sum-add;

Program : 

public class MissingElement

{

    public static void main(String[] args) {

        int array[]={1,2,3,5,6,7,8,9,10};

        int expected=array.length+1;

        int sum=expected*(expected+1)/2;

        int add=0;

        for (int i=0;i<array.length;i++){

            add=add+array[i];

            System.out.println("Missing Element is "+(sum-add));

        }

    }

}

Output : 

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