Java Program to Identify Missing Numbers in a Given Array

This is a Java Program to Identify Missing Numbers in a Given Array.

We made a method as getMissingNo in which we pass the array and length of the array as arguments and using this method we calculate the missing number and hence we get the desired output.

Here is the source code of the Java Program to Identify Missing Numbers in a Given Array. The Java program is successfully compiled and run on a Windows system. The program output is also shown below.

  1. public class Missing
  2. {
  3.     static int getMissingNo (int a[], int n)
  4.     {
  5.         int i, total;
  6.      	total  = (n + 1) * (n + 2) / 2;
  7.      	for ( i = 0; i < n; i++)
  8.      	total -= a[i];
  9.      	return total;
  10.     }
  11.     public static void main(String... s)
  12.     {
  13.       	int a[ ] = {1, 2, 4, 5, 6};
  14.       	int miss = getMissingNo(a, 5);
  15.       	System.out.println("The number missing is :"+miss);
  16.     }
  17. }


$ javac
$ java Missing
The number missing is :3

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He is Linux Kernel Developer & SAN Architect and is passionate about competency developments in these areas. He lives in Bangalore and delivers focused training sessions to IT professionals in Linux Kernel, Linux Debugging, Linux Device Drivers, Linux Networking, Linux Storage, Advanced C Programming, SAN Storage Technologies, SCSI Internals & Storage Protocols such as iSCSI & Fiber Channel. Stay connected with him @ LinkedIn