Frequently Asked Java Program 17: Find Missing Number in an Array

Topic : Find Missing Number in an Array

#########################
Udemy Courses:
#########################

Manual Testing+Agile with Jira Tool
************************************

Selenium with Java+Cucumber
********************************

Selenium with Python & PyTest
********************************

Selenium with python using Robot framework
****************************************

API Testing(Postman, RestAssured & SoapUI)
*****************************************

Web & API Automation using Cypress with Javascript
********************************************

Playwright with Javascript
**************************

Jmeter-Performance Testing
************************

SDET Essencials(Full Stack QA)
*************************

Appium-Mobile Automation Testing
************************************

Java Collections
*****************

Python Programming
*********************

Cucumber BDD Framework
***************************

Protractor with Javascript
***************************

####################################
Youtube Playlists:
####################################

Manual Testing & Agile
***********************

SQL
*************************

linux & Shell Scripting
**********************

Java
**********************

Selenium With Java+Cucumber
********************************

Python
********************************

Selenium With Python,Pytest&Behave
***************************************

Selenium With Python Using Robert Framework
(Web&API Testing)
*************************************************

API Testing (Postman,SoapUi,&Rest Assured)
**********************************************

Mobile App Testing Appium
****************************

Performance Testing Jmeter
*******************************

Maven,Jenkins,Git,Github,CI/CD
*******************************

SQL,DB Testing&ETL,Bigdata
*******************************

JavaScript Based Automation Tools
********************************

Selector Hub Tools
********************

GraphQL
******************

Cypress API Testing
********************

Cypress Web Testing
**********************

Playwright with Javascipt
**************************

#MissingNumberPython
#ArrayMissingElement
#PythonArrayPuzzle
#ArrayManipulation
#NumberSearchChallenge
#CodingPuzzle
#PythonPuzzleSolving
#AlgorithmsInPython
#ArrayManipulation
#PythonProgramming
#TechInterviewPrep
#DataStructures
#PythonArrays
#AlgorithmicPuzzle
#CodingInPython
#MissingNumberChallenge
#ArrayProblemSolving
#LogicPuzzle
#CodingPractice
#TechInterviews
#ProblemSolvingPython
#ArrayAlgorithm
#PythonCodeChallenge
#LogicalThinking
#ProgrammingPuzzle
#ArrayManipulation
#CodingProblems
#PythonAlgorithms
#ArraySearch
#CodeLogic
#PythonPuzzles
#MissingNumberArray
#AlgorithmExploration
#PythonCodingChallenge
#ArrayLogic
#TechPuzzles
#ProblemSolvingInPython
#AlgorithmicThinking
#PythonArrayChallenge
#PuzzleSolving
#CodingMindTeasers
#LogicChallenge
#PythonAlgorithmExploration
#ArrayPuzzle
#CodeOptimization
#ProgrammingLogic
#BrainTeasers
#PythonTechInterview
#ArrayCode
#CodeBreaker

[nileshpardeshi]

How can we calculate if two numbers are missing?

[mayurahire]

if you don`t no how elements are given you will follow this code also --->
public static void main(String[] args) {
int a[]= {10, 11, 13, 14, 15, 16, 17};
int sum1=0, sum2=0;
for(int i=0;i<a.length;i++)
{
sum1=sum1+a[i];
}
of Array "+sum1);
for(int i=a[0];i<=a[a.length-1];i++)
{
sum2=sum2+i;
}
total of Array "+sum2);
System.out.println("Missing values is --> "+(sum2-sum1));
}

[Mustaq]

what if multiple numbers are missing ? in line like (1, 4, 5, 6, 7)

[vlncxgg]

Sum of numbers you can do this way .... n*n+1/2

[mathiyalagan.p]

line 27
for(int i=1;i<=a.length+1;i++);
we can use like this,
i thing

[AmanRaj-kcuu]

appreciation for ur efforts that u put in this series

[archismansural]

This is very hard-coded. A program should be as flexible as possible.

[fedbizdynamicsllc]

For the missing Element of Array, I have the following code which does not give me the missing number. I think there is something wrong with the condition you stated: public static void main(String[] args) {

int arr[]= {1, 2, 3, 4, 5, 7, 8, 9};

// steps - sum1 is based on the Index

int sum1=0;
for (int i=0; i<arr.length;i++)
{
sum1=sum1+arr[i];
}
System.out.println("Sum of Array Elements:-> " + sum1);

// steps - sum2 is based on the first element(1) and last element(5)

int sum2=0;
for (int i=1; i<=5; i++)
{
sum2=sum2+i;
}
System.out.println("Sum of range of Array Elements 2 : " + sum2 );
System.out.println("Missing Number is : " + (sum2-sum1));
}

}

[nikhil]

What to do if multiplie numbers are missing

[tru]

n = a.length + 1
sum2 = n(n+1)/2;
return sum2 % sum1;

[rightatfirst]

Sir why so complicated, use int c=arr[0] and compare using for loop for arr[i] with c++ values, if mismatch then missing.. please Let me know on this

[ruhishabnam]

Sir this program is for 1 missing number..if 2 numbers are missing does it show 2 missing numbers??

[teluguoptionbuyers]

this need to be sorted or use smallest to find the starting number. you made it to start from 1 always.

[omkarpatil]

How to find missing num if numbers are not in sequence (we dont knw range values)and array length is very large?

[lakshmiprasanna]

The above solution is only for any one value is missing in an array what if multiple values are missing in an array, If any one has the solution for my quiry please respond

[ALdracoyt]

what if multiple numbers are missing ?

[praveenkumar-drde]

This is only for one missing number in an array.

Am I right?

[deepakdubey]

Thanks Sir ..for this simple approach ..🕺

[softwaretestingbasics]

Really it's veryful...but I have qsn..if suppose if the number in odd or even sequence will it work ?

[shaikhirfan]

hello sir if it is depends on user if they type some other numbers. then how can we find the missing numbers? Your logic is only when input is given in the program. please clarify