Question

Design and implement a function with no input parameter which reads a number from input (like 123). Only non-decimal numbers are valid (floating points are not valid). The number entered by the user should not be divisible by 10 and if the user enters a number that is divisible by 10 (like 560), it is considered invalid and the application should keep asking until the user enters a valid input. Once the user enters a valid input, the program calculates the reverse of the input number (for 153, the reverse is 351) and prints the result and returns the results.

Answer 1

Hi,

This has been implemented in C# Console Llibrary. Please find the screenshot of the running program and later find the code snippets.

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

namespace General
{
    class Program
    {
        static void Main(string[] args)
        {          

            ProcessLogic(true);
            
        }

        /// <summary>
        /// Get Input from user and Process the logic
        /// </summary>
        /// <param name="flag"></param>
        static void ProcessLogic(bool flag) {
            
            int nInputNumber = 0;

            if(flag)
                Console.WriteLine("Enter Number");
            else
                Console.WriteLine("Enter the valid Number");

            //Read number and check that its valid or not
            bool bFlag = Int32.TryParse(Console.ReadLine(), out nInputNumber);

            //Check Validation of number entered by user
            if ((nInputNumber <= 0) || ((nInputNumber % 10) == 0))
            {
                //Case of Invalid number, show error message
                Console.WriteLine("Enter the valid Number");
                Console.ReadLine();
                
                //Recursive call
                ProcessLogic(false);
            }
            else
            {
                //Case when user entered the valid number then reverse the number
                ReverseNumberLogic(nInputNumber);
            }              
        }

        /// <summary>
        /// Revers the Input Number
        /// </summary>
        /// <param name="nInputNumber"></param>
        static void ReverseNumberLogic(int nInputNumber) {
            int  reverse = 0, rem;          
            
            //Loop until inputnumber !=0
            while (nInputNumber != 0)
            {
                rem = nInputNumber % 10;
                reverse = reverse * 10 + rem;
                nInputNumber /= 10;
            }

            //Print the result
            Console.Write("Reverse of the input number is: " + reverse);
            Console.ReadLine();
        }
    }
}

Thanks