Java Program to find the Missing Number in an Array with output

Category : Java | Sub Category : Java Programs | By Prasad Bonam Last updated: 2023-08-14 12:05:03 Viewed : 317

Here is a Java program to find the missing number in an array of integers along with the expected output:

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public class MissingNumberFinder {
    public static void main(String[] args) {
        int[] array = {1, 2, 4, 6, 3, 7, 8}; // The missing number is 5
        int n = array.length + 1; // Including the missing number
        int expectedSum = n * (n + 1) / 2; // Sum of numbers from 1 to n
        
        int actualSum = 0;
        for (int num : array) {
            actualSum += num;
        }
        
        int missingNumber = expectedSum - actualSum;
        
        System.out.println("Given array:");
        for (int num : array) {
            System.out.print(num + " ");
        }
        System.out.println("

The missing number is: " + missingNumber);
    }
}

Expected Output:

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Given array:
1 2 4 6 3 7 8 

The missing number is: 5

In this program, we calculate the missing number in the array {1, 2, 4, 6, 3, 7, 8} using the same approach as before. The output displays the given array and the missing number, which is 5 in this case.