C#: Check whether a given number is within 2 of a multiple of 10

Last update on June 25 2025 13:03:00 (UTC/GMT +8 hours)

Within 2 of Multiple of 10

Write a C# Sharp program to check whether a given number is within 2 of a multiple of 10.

Sample Solution:-

C# Sharp Code:

using System;
using System.Linq;

namespace exercises
{
    // Class declaration
    class Program
    {
        // Main method - entry point of the program
        static void Main(string[] args)
        {
            // Calling the 'test' method with different integers and printing the results
            Console.WriteLine(test(3));   // Output: True
            Console.WriteLine(test(7));   // Output: True
            Console.WriteLine(test(8));   // Output: True
            Console.WriteLine(test(21));  // Output: False
            Console.ReadLine(); // Keeping the console window open
        }

        // Method to check if the last digit of a number is less than or equal to 2 or greater than or equal to 8
        public static bool test(int n)
        {
            // Returns true if the last digit of 'n' is less than or equal to 2 OR greater than or equal to 8
            return n % 10 <= 2 || n % 10 >= 8;
        }
    }
}

Sample Output:

False
False
True
True

Flowchart:

For more Practice: Solve these Related Problems:

Write a C# program to return true if a number is within 1 of a multiple of 5.
Write a C# program to return true if a number is within 3 of a multiple of 20.
Write a C# program to determine if a number is either a multiple of 10 or within 2 of one.
Write a C# program to check whether a number is within 2 of both a multiple of 5 and 10.

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