Happy Number Program in C++1 min read

In this tutorial, we will write a C++ program to check happy number. Let us start by defining a happy number.

Happy Number

A number is said to be a happy number if it yields 1 after a few steps and each step is the sum of the squares of the digits of its results. The sum of the squares starts with the given number and till it reaches one.

Follow the diagram below:

happy number
Happy Number

Explanation: In the above diagram input is 19. Then the digits 1 and 9 are squared which gives the result 82. After that, the digits 8 and 2 are squared and yield the results 68 and this continues till the final result is 1. And then we can say that 19 is a happy number, if not then it is not a happy number.


Happy Number Program in C++

Question: C++ program to check whether a number is happy or not using function

Output:

Enter the number: 15
15 is not a happy number

//Another Execution
Enter the number: 32
32 is a happy number


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