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Java program to check for a happy number

This is a java program for happy number but before that what is a happy number.

A number whose sum of the square of digits is ultimatly equal to 1 is a happy number. By ultimately we mean that starting with any positive number we continue the addition of square of digits till we get a single digit number (0 ~ 9). But the on whose sum is ultimately 1 is a happy number.

Example #1: 13 ; 12 + 32 = 1 + 9 =10 ; 12+ 02= 1 (Thus a happy number)
Example #2: 32; 3 2 + 2 2 = 9 + 4 = 13; and in Example#1 13 is already a happy number;
Some of the first happy numbers are: 1, 7, 10, 13, 19, 23, 28, 31, 32, 44, 49, 68, 70, 79, 82, 86, 91, 94, 97, 100, 103, 109, 129, 130.

Java program to check for a happy number

 OUTPUT: 

Program to check it is a happy number
Program to check a happy number

Incoming terms: Java program to check a happy number, program to check for a happy number.

Also See:   Harshad Number Program in Java (Niven Numbers)

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