C#: Check whether a given non-negative given number is a multiple of 3 or 7, but not both

Last update on June 25 2025 13:03:56 (UTC/GMT +8 hours)

Multiple of 3 or 7 but Not Both

Write a C# Sharp program to check if a given number that is not negative is a multiple of 3 or 7, but not both.

Visual Presentation:

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(21));  // Output: False
            Console.ReadLine(); // Keeping the console window open
        }

        // Method to check if a number is divisible by either 3 or 7 exclusively
        public static bool test(int n)
        {
            // Return the result of the exclusive OR (^) operation between the conditions
            // Returns true if either n is divisible by 3 or n is divisible by 7, but not both
            return n % 3 == 0 ^ n % 7 == 0;
        }
    }
}

Sample Output:

True
True
False

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C# program to check if a number is a multiple of 2 or 4, but not both.
• Write a C# program to return true if a number is a multiple of either 5 or 10, but not both.
• Write a C# program to verify if a number is divisible by either 9 or 12 but not by 36.
• Write a C# program to return true if a number is a multiple of 3 and not a multiple of 6.

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