## Java Program to Check whether a Number is Armstrong or Not

Write a java program to check Armstrong number. In this program, we are going to write a java code which checks whether an input number is Armstrong or not.

Let’s first understand what is Armstrong number?

## Java Program to Find Missing Number in Array

Write a java program to find missing number in array. Given an array of n-1 integers and these integers are in the range of 1 to n. One of the integer is missing from an array. We have to write an efficient java code to find missing number from an array. An array does not contains any duplicates.

## Binary Search in Java

Write a program to implement Binary Search in Java. In this tutorial, we are going to implement a binary search algorithm in Java. Before implementing this algorithm, let’s first understand what is binary search and how it works.

## Find Pair of Elements in an Array whose Sum is Equal to a given number

Find Pair of Elements in an Array whose Sum is Equal to given number.  Given an array of n integers and a number x, We have to write a code to find a pair of elements(a,b) in an array whose sum is equal to a given number x.

## C Program to Count Number of Words in a String

Write a C program to count number of words in a string. Given an input string, we have to write a code to count number of words in a string. The words in a string are separated by space(‘ ‘).