In this tutorial, you will learn writing a program using Python to find the missing number in integer array of 1 to 100.
This Program is not generic, It has some limitations like
- It can find only one missing number in an array.
- Here we are just adding numbers from 0 to n, where n is number of elements array can have.
- User can give input only between 0 to n.
- To find missing number, subtract sum of numbers given by user from total sum of numbers from 0 to n.
Also Read This: Java Program to find missing number in array.
arr =  n = int(input("enter size of array : ")) for x in range(n-1): x=int(input("enter element of array : ")) arr.append(x) sum = (n*(n+1))/2; sumArr = 0 for i in range(n-1): sumArr = sumArr+arr[i]; print(int(sum-sumArr))