C++ language. please provide detailed comments (for beginners) and use easy to understand/trace code.

Thank you

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1 Happy numbers A happy number is a natural number (non-negative integer) that eventually becomes 1 when iterated over the sum of squared digits function. For example, 28 is happy: 28 22 +82 = 68 +62 +82 = 100 11 + 0 + 0 = 1 But 4 is unhappy (omitting intermediate results), as the chain of numbers led to the original number. 4 +16 37 58 89 145 42 420 +4 ... In fact, every unhappy positive number eventually converges with 4. Write a function bool isHappy (unsigned int n) that receives as an argument a non- negative integer n and returns true if n is happy. Examples: isHappy (4) returns false. isHappy (13) returns true. isHappy (28) returns true