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MissingNumber.java

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/**

* @author Kanahaiya Gupta

*

*/

public class MissingNumber {

public static int getMissingNumber(int numbers[], int n) {

int expectedSum = n * (n + 1) / 2;

int actualSum = 0;

for (int number : numbers) {

actualSum = actualSum + number;

}

int missingNo = expectedSum - actualSum;

return missingNo;

}

public static void main(String[] args) {

int numbers1[] = { 6, 3, 2, 4, 1, 7, 5, 10, 8 };

int n1 = 10;

int missingNumber1 = getMissingNumber(numbers1, n1);

System.out.println("Output 1: "+missingNumber1);

int numbers2[] = { 2, 3, 1, 5 };

int n2 = 5;

int missingNumber2 = getMissingNumber(numbers2, n2);

System.out.println("Output 2: "+missingNumber2);

}

}