C#: Check whether a given array of integers contains no 3 or a 5

Last update on June 28 2025 12:53:13 (UTC/GMT +8 hours)

Check If Array Contains No 3 or 5

Write a C# Sharp program to check if a given array of integers contains no 3 or 5.

Visual Presentation:

C# Sharp: Basic Algorithm Exercises - Check whether a given array of integers contains no 3 or a 5.

Sample Solution:

C# Sharp Code:

using System; // Importing the System namespace

namespace exercises // Defining a namespace called 'exercises'
{
    class Program // Defining a class named 'Program'
    {
        static void Main(string[] args) // The entry point of the program
        {               
            // Outputting the result of the 'test' method with different integer arrays as arguments
            Console.WriteLine(test(new[] { 5, 5, 5, 5, 5 })); // Testing the method with an array containing all 5s
            Console.WriteLine(test(new[] { 3, 3, 3, 3 })); // Testing the method with an array containing all 3s
            Console.WriteLine(test(new[] { 3, 3, 3, 5, 5, 5 })); // Testing the method with an array containing both 3s and 5s
            Console.WriteLine(test(new[] { 1, 6, 8, 10 })); // Testing the method with an array containing values other than 3 or 5
        }           

        // Method to check if an array contains both 3 and 5 but not both
        static bool test(int[] nums)
        {
            var three = false; // Variable to track if number 3 is present
            var five = false; // Variable to track if number 5 is present

            for (int i = 0; i < nums.Length; i++)
            {
                if (nums[i] == 3) {three = true;} // Setting 'three' to true if 3 is found
                if (nums[i] == 5) {five  = true;} // Setting 'five' to true if 5 is found
                if (three && five) return false; // If both 3 and 5 are present, return false
            }
            return true; // Return true if either 3 or 5 (but not both) is present in the array
         }  
    }     
}

Sample Output:

True
True
False
True

Flowchart:

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C# Sharp Code Editor:

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