C#: Check whether a given positive number is a multiple of 3 or a multiple of 7

Last update on June 25 2025 13:04:10 (UTC/GMT +8 hours)

Multiple of 3 or 7

Write a C# Sharp program to check if a given positive number is a multiple of 3 or 7.

Visual Presentation:

Sample Solution:

C# Sharp Code:

using System;

// Namespace declaration
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 displaying the returned boolean values
            Console.WriteLine(test(3));   // Output: True
            Console.WriteLine(test(14));  // Output: True
            Console.WriteLine(test(12));  // Output: True
            Console.WriteLine(test(37));  // Output: False
            Console.ReadLine();            // Keeping the console window open
        }

        // Method to check if an integer is divisible by 3 or 7
        public static bool test(int n)
        {
            // Returns true if the input integer is divisible by 3 or 7
            return n % 3 == 0 || n % 7 == 0;
        }
    }
}

Sample Output:

True
True
True
False

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C# program to return true if a number is divisible by both 3 and 7, but not by 2.
• Write a C# program to check if a number is a multiple of 3, 5, or 7 and print a different word for each.
• Write a C# program to test whether a number is a power of 3 or a multiple of 7.
• Write a C# program to return true only if a number is divisible by 3 or 7 but not both.

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C# Sharp Code Editor:

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