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

Last update on June 23 2025 12:59:36 (UTC/GMT +8 hours)

Check Multiple of 3 or 7

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

C# Sharp Exercises: Check if a given positive number is a multiple of 3 or a multiple of 7

C# Sharp Code:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

public class Exercise33 {
    static void Main(string[] args) {
        // Display a message asking the user to input the first integer
        Console.WriteLine("\nInput first integer:");

        // Read the input from the user and convert it to an integer 'x'
        int x = Convert.ToInt32(Console.ReadLine());

        // Check if the entered number 'x' is greater than 0
        if (x > 0) {
            // If 'x' is positive, check if it is divisible by 3 or 7 using the modulo operator
            // Print the result of the logical OR operation between the conditions (divisible by 3 or 7)
            Console.WriteLine(x % 3 == 0 || x % 7 == 0);
        }
    }
}

Sample Output:

Input first integer:                                                   
15                                                                     
True

Flowchart:

For more Practice: Solve these Related Problems:

Write a C# program to find all numbers between 1 and 1000 which are divisible by both 3 and 7.
Write a C# program to determine whether a given number is divisible by 3, 7, or both, and output a custom message.
Write a C# program to check if a number is divisible by 3 or 7 but not both.
Write a C# program to compute the sum of all numbers between 1 and n that are divisible by 3 or 7.

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