How can I make my program stop reading user input when no input is given?

Question

I am trying to make a program that calculates some specific data from numbers given by a user. In this example, my program counts amount of numbers in range (10,103) that are divisible by 2, and amount of numbers that are in range (15,50) divisible by 3 within numbers given by user. On this stage, my program gives the results, when 10 numbers are given (as I specified it in the loop). How can I make my program stop reading numbers and give the results when user imputs an empty line no matter if he, entered 5 or 100 numbers before?

Here is my code, as it looks for now:

using System;

namespace Program1
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            int input10_103_div_2 = 0;
            int input15_50_div_3 = 0;

            for (int i = 0; i < 10; i++)
            {
                string input = Console.ReadLine ();
                double xinput = double.Parse (input);

                if (xinput > 10 && xinput <= 103 && (xinput % 2) == 0)
                {
                    input10_103_div_2++;
                }
                if (xinput > 15 && xinput < 50 && (xinput % 3) == 0) 
                {
                    input15_50_div_3++;
                }
            }
            Console.WriteLine ("Amount of numbers in range (10,103) divisible by 2: " + input10_103_div_2);
            Console.WriteLine ("Amount of numbers in range (15,50) divisible by 3: " + input15_50_div_3);
        }
    }
}

Cyclonecode · Accepted Answer · 2013-07-26 05:39:25Z

5

instead of for, do:

string input = Console.ReadLine();
while(input != String.Empty)
{
     //do things
     input = Console.ReadLine();
}

if you're trying to allow any number of inputs. Or

if(input == "")
    break;

if you want the for loop

edited Jul 26, 2013 at 5:39

Cyclonecode

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answered Jul 15, 2013 at 17:18

Jonesopolis

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Comments

David Sherret · Accepted Answer · 2013-07-15 17:22:17Z

2

Change your loop to go forever and break out of the loop when the string is empty:

for (;;)
{
    string input = Console.ReadLine ();
    if (String.IsNullOrEmpty(input))
    {
        break;
    }

    // rest of code inside loop goes here
}

answered Jul 15, 2013 at 17:22

David Sherret

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Comments

Cyclonecode · Accepted Answer · 2013-07-26 05:39:05Z

0

If you want to restructure the loop, you can use a do while loop:

string input;
do{
    input = Console.ReadLine();
    //stuff
} while(!string.IsNullOrEmpty(input));

If you just want to be able to break early:

string input = Console.ReadLine ();
if(string.IsNullOrEmpty(str))
  break;
double xinput = double.Parse (input);

edited Jul 26, 2013 at 5:39

Cyclonecode

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answered Jul 15, 2013 at 17:19

Austin Henley

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12 Comments

Jonesopolis Over a year ago

in this scenario he will be doing //stuff against an empty string. He'll need another if for validation

Austin Henley Over a year ago

@Jonesy Right, that is fine. Do while conveys his logic the best and I was shooting for his requirement of "no matter if he entered 5 or 100".

Austin Henley Over a year ago

@Jonesy Which in my opinion is no worse than your answer using two Console.ReadLine.

Jonesopolis Over a year ago

Yeah I suppose its just personal choice

David Sherret Over a year ago

@AustinHenley Why would you think that?

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