Let's write code to check whether a number is IsHappy or not happy in C#. Now call this function from the main function in the Program class. Output :

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Happy Number

Steilla Mitchel 1160 12 Jun 2024

Write an algorithm to determine if a number n is happy.

A happy number is a number defined by the following process:

Starting with any positive integer, replace the number by the sum of the squares of its digits.
Repeat the process until the number equals 1 (where it will stay), or it loops endlessly in a cycle which does not include 1.
Those numbers for which this process ends in 1 are happy.

Return true if n is a happy number, and false if not.

1 Answers

Ravi Vishwakarma 12 Jun 2024

Let's write code to check whether a number is IsHappy or not happy in C#.

// Method to determine if a number is a happy number
public static bool IsHappy(int n)
{
    // Continue the process while n is greater than 10
    // If n becomes less than or equal to 10, we exit the loop to avoid infinite loops for unhappy numbers
    while (n > 10)
    {
        // Initialize the result with the initial number
        // Reset result to 0 to calculate the sum of the squares of the digits
        int result = 0;

        // Continue extracting and squaring digits until n becomes 0
        while (n != 0)
        {
            // Get the last digit of n
            int LastDigit = n % 10;

            // Add the square of the last digit to result
            result += (LastDigit * LastDigit);

            // Remove the last digit from n
            n /= 10;
        }

        // Update n to the result to repeat the process with the new number
        n = result;
    }

    // If the final value of n is 1, return true (indicating the number is happy)
    // Otherwise, return false (indicating the number is not happy)
    return n == 1;
}

Now call this function from the main function in the Program class.

public static void Main()
{
    IList<int> list = new List<int>
    {
        19, 1, 6, 100, 45
    };

    foreach (var item in list)
    {
        Console.WriteLine(item + " " + Program.IsHappy(item));
    }

    Console.ReadLine();
}

Output :

19 True
1 True
6 False
100 True
45 False

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Happy Number

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