I want to take input as "Integer" value only between 20 to 50.

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I want to take input as "Integer" value only between 20 to 50. It should give error if any string value is taken or any value which is out side the range of 20 to 50.

C#

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

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

            Console.WriteLine("Enter the integer value only");
            int number = Convert.ToInt32(Console.ReadLine());

            if (number <= 20 && number >= 50)
            {
                Console.WriteLine("Please enter the number between 20 to 50");
            }

           // Program should not close and it should display again from start unless user enter the value between 20 to 50.


          
        }

        
    }
}

Posted 16-Dec-15 4:22am

Aditakumar2311

Updated 16-Dec-15 4:26am

v3

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2 solutions

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Richard Deeming · Accepted Answer · 2015-12-16T04:36:00

Use int.TryParse[^] to attempt to convert the user's input to a number.

Use the OR operator (||) to test whether the number is outside of the range. It can't be both "less than or equal to 20" and "greater than or equal to 50" at the same time!

Add a loop to re-prompt the user until you get a valid number.

C#

int number;
bool isValid = false;
while (!isValid)
{
    Console.WriteLine("Enter the integer value only");
    string input = Console.ReadLine();
    
    if (!int.TryParse(input, out number))
    {
        Console.WriteLine("The string '{0}' is not an integer.", input);
    }
    else if (number <= 20 || number >= 50)
    {
        Console.WriteLine("Please enter the number between 20 to 50");
    }
    else
    {
        isValid = true;
    }
}

Console.WriteLine("You entered {0}.", number);

phil.o · Accepted Answer · 2015-12-16T04:37:00

Solution 2

A do..while loop could do it:

C#

int number;
bool ok;
do {
   Console.WriteLine("Enter an integer value between 20 and 50, exclusive");
   ok = Int.TryParse(Console.ReadLine(), out number);
   if (!ok) {
      number = 0;
   }
} while ((number <= 20) || (number >= 50))

This will keep asking for a valid value until in right range.

Hope this helps.

Posted 16-Dec-15 4:37am

phil.o

Comments

Richard Deeming 16-Dec-15 10:43am

Snap! :)

phil.o 16-Dec-15 10:47am

:)

Sergey Alexandrovich Kryukov 16-Dec-15 11:07am

Sure, a 5.
—SA

phil.o 16-Dec-15 11:25am

Thank you Sergey :)