Happy Number

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Write a Java program to check if the given number is happy or not is a commonly asked coding interview question. To solve this problem, first we need to know what is a happy number? Take any positive integer, find the sum of the squares of its digits, repeat this process until you get 1 or if the sum equals 4(i.e repeats the cycle again). If the sum equals 1 (in the process) then the given number is happy otherwise it is an unhappy number (or sad number).

 Program to test whether given number is a happy number or not
Developer: Abhishek Nandakumar
Licence: OpenSource
Platform/Language: java
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