Q:

Program to print the duplicate elements of an array

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robaa
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2022-11-12
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In this program, we need to print the duplicate elements present in the array. This can be done through two loops. The first loop will select an element and the second loop will iteration through the array by comparing the selected element with other elements. If a match is found, print the duplicate element.

In the above array, the first duplicate will be found at the index 4 which is the duplicate of the element (2) present at index 1. So, duplicate elements in the above array are 2, 3 and 8.

Algorithm

  • STEP 1: START
  • STEP 2: INITIALIZE arr[]= {1, 2, 3, 4, 2, 7, 8, 8, 3}.
  • STEP 3: PRINT "Duplicate elements in given array:"
  • STEP 4: REPEAT STEP 5 to STEP 7 for(i=0; i<arr.length; i++)
  • STEP 5: REPEAT STEP 6 and STEP 7 for(j=i+1; j<arr.length; j++)
  • STEP 6: if(arr[i] == arr[j])
  • STEP 7: PRINT arr[j]
  • STEP 8: END
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robaa
2022-11-12
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Program:

public class DuplicateElement {  
public static void main(String[] args) {  
        //Initialize array  
        int [] arr = new int [] {1, 2, 3, 4, 2, 7, 8, 8, 3};  
        System.out.println("Duplicate elements in given array: ");  
        //Searches for duplicate element  
        for(int i = 0; i < arr.length; i++) {  
            for(int j = i + 1; j < arr.length; j++) {  
                if(arr[i] == arr[j])  
                    System.out.println(arr[j]);  
            }  
        }  
    }  
}

Output:

 Duplicate elements in given array:
2
3
8

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