C#: Print even or odd numbers in a given range

Last update on December 20 2024 12:43:13 (UTC/GMT +8 hours)

Write a program in C# Sharp to print even or odd numbers in a given range using recursion.

Calculating a Even Numbers:

Even Numbers between 1 to 100:

Calculating a Odd Numbers:

Odd Numbers between 1 to 100:

Sample Solution:-

C# Sharp Code:

using System;

// Class definition named 'RecExercise6'
class RecExercise6
{
    // Main method, the entry point of the program
    public static void Main()
    {
        int n;

        // Display a description of the program
        Console.Write("\n\n Recursion : Print even or odd numbers in a given range :\n");
        Console.Write("-------------------------------------------------------------\n");

        // Prompt user to input a range
        Console.Write(" Input the range to print starting from 1 : ");
        n = Convert.ToInt32(Console.ReadLine());

        // Display even numbers from 1 to n
        Console.WriteLine("\n All even numbers from 1 to {0} are : ", n);
        EvenAndOdd(2, n); // Call the function EvenAndOdd for even numbers

        // Display odd numbers from 1 to n
        Console.WriteLine("\n\n All odd numbers from 1 to {0} are : ", n);
        EvenAndOdd(1, n); // Call the function EvenAndOdd for odd numbers
        Console.WriteLine("\n\n");

        return;
    }

    // Recursive function to print even or odd numbers in a given range
    static void EvenAndOdd(int stVal, int n)
    {
        // Base case: If starting value exceeds the range, return
        if (stVal > n)
            return;

        // Print the current value (even or odd)
        Console.Write(" {0}  ", stVal);

        // Recursive call: Increment stVal by 2 and call EvenAndOdd function
        EvenAndOdd(stVal + 2, n);
    }
}

Sample Output:

 Recursion : Print even or odd numbers in a given range :                                                     
-------------------------------------------------------------                                                 
 Input the range to print starting from 1 : 20                                                                
                                                                                                              
 All even numbers from 1 to 20 are :                                                                          
 2   4   6   8   10   12   14   16   18   20                                                                  
                                                                                                              
 All odd numbers from 1 to 20 are :                                                                           
 1   3   5   7   9   11   13   15   17   19

Flowchart :

C# Sharp Code Editor:

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