Print N numbers without using Loops

Note :This post is first published on Mar-2013 in my previous blog Techkindle. Moving the content here.

In some interviews we may get a question like print certain numbers without using any loops.There are many approaches to accomplish this task. Here i am giving two of the approaches

1. With recursion
2. With goto statement

With Recursion

void PrintWithRecursion(int fromNumber, int toNumber)
{
    if (fromNumber <= toNumber)
    {
        Console.Write(fromNumber + " ");
        fromNumber++;
        PrintWithRecursion(fromNumber, toNumber);
    }
}

With goto statement

void PrintWithGoto(int fromNumber, int toNumber)
{
  Repeat:
        if (fromNumber <= toNumber)
        {
            Console.Write(fromNumber + " ");
            fromNumber++;
            goto Repeat;
        }
  Console.Read();
}

Complete Source code:

	using System;
	namespace PrintValues
	{
	class PrintTest
	{
	static void Main(string[] args)
	{
	Console.WriteLine("Please enter from and to numbers\n");
	string[] numbers = Console.ReadLine().Split();
	int fromNumber = int.Parse(numbers[0]);
	int toNumber = int.Parse(numbers[1]);
	PrintTest objPrintTest = new PrintTest();
	Console.WriteLine("\nList of numbers with Recursion");
	Console.WriteLine("—————-");
	objPrintTest.PrintWithRecursion(fromNumber, toNumber);
	Console.WriteLine("\n\nList of numbers with goto");
	Console.WriteLine("—————-");
	objPrintTest.PrintWithGoto(fromNumber, toNumber);
	Console.Read();
	}
	//printing the numbers using recursion
	void PrintWithRecursion(int fromNumber, int toNumber)
	{
	if (fromNumber <= toNumber)
	{
	Console.Write(fromNumber + " ");
	fromNumber++;
	PrintWithRecursion(fromNumber, toNumber);
	}
	}
	//Printing the numbers using goto statement.
	void PrintWithGoto(int fromNumber, int toNumber)
	{
	Repeat:
	if (fromNumber <= toNumber)
	{
	Console.Write(fromNumber + " ");
	fromNumber++;
	goto Repeat;
	}
	Console.Read();
	}
	}
	}

view raw PrintNumbersWithoutLoop hosted with ❤ by GitHub

output:

Happy Learning 🙂