How can I use switch-case in this way?

Question

1.00/5 (2 votes)

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C#

using System;
using System.Text.RegularExpressions;

namespace ConsoleApp18
{
    class Program
    {
        static void Main(string[] args)
        {
            int value1;

            Console.WriteLine("Please enter humidity(0-100)");

            value1 = Convert.ToInt32(Console.ReadLine());
            switch (value1)
            {
                case value1 <= 20 && value1 > 0:
                    Console.WriteLine("too dry!");
                    break;
            }
        }
    }
}

What I have tried:

I HAVE TO USE SWİTCH-CASE;
QUESTİON: PROGRAM FOR CONVERTS HUMIDITY VALUES TO A HUMAN READABLE FORMAT.

PROGRAM WILL WRITE TO OUTPUT THE FOLLOWING RESULTS DEPENDING INPUT RANGES BETWEEN 0 AND 100
%20 AND LOWER-> TOO DRY
%21-%40-> DRY
%41-&60-> LITTLE DRY
%61-%80-> LITTLE MOIST
%81 AND HIGHER -> MOİST

PLEASE HELP ME TO WRITE THIS CODE I CANT DO IT.

Posted 27-Oct-20 11:23am

Member 14976913

Updated 27-Oct-20 16:52pm

PIEBALDconsult

v2

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Comments

j snooze 27-Oct-20 17:50pm

A simple google search would do the trick. Just look for "c# switch statement greater than".
Google first, ask questions second on here. If we can find it within seconds on an internet search, you can too. Its a wonderful tool for figuring out how to do things.

PIEBALDconsult 27-Oct-20 17:50pm

That doesn't sound like a suitable situation for switch/case

Member 14976913 27-Oct-20 18:49pm

Such a upper-level brain person... (j snooze)I did all searching and I couldn't reach result succesfully so as I said I need some help.

BillWoodruff 28-Oct-20 4:39am

There are new ways in both C# 7 and 8, to do this, but why would I waste my time helping a lazy whiner like you who insults people trying to help ? Grow up !

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PIEBALDconsult · Answer 1 · 2020-10-27T16:52:00

Simples.

C#

public enum Humidity
{
  [System.ComponentModel.DescriptionAttribute("OUT OF RANGE")]
  Invalid  = 0
,
  [System.ComponentModel.DescriptionAttribute("TOO DRY")]
  VeryLow  = 1
,
  [System.ComponentModel.DescriptionAttribute("DRY")]
  Low      = 2
,
  [System.ComponentModel.DescriptionAttribute("LITTLE DRY")]
  Medium   = 3
,
  [System.ComponentModel.DescriptionAttribute("LITTLE MOIST")]
  High     = 4
,
  [System.ComponentModel.DescriptionAttribute("MOİST")]
  VeryHigh = 5
}

private static Humidity
GetHumidityLevel
(
  int Percent
)
{
  Humidity result = Humidity.Invalid ;

  if ( ( Percent >= 0 ) && ( Percent <= 100 ) )
  {
    result = (Humidity) ( ( Percent - 1 ) / 20 + 1 ) ;
  }

  return ( result ) ;
}

private static System.Collections.Generic.Dictionary<Humidity,string> hum =
  new System.Collections.Generic.Dictionary<Humidity,string>() ;

private static string
GetHumidityDescription
(
  Humidity Level
)
{
  string result ;

  if ( !hum.TryGetValue ( Level , out result ) )
  {
    System.Reflection.FieldInfo f = typeof(Humidity).GetField
    (
      Level.ToString ( "G" )
    ,
      System.Reflection.BindingFlags.Public
      |
      System.Reflection.BindingFlags.Static
    ) ;

    System.ComponentModel.DescriptionAttribute[] a = (System.ComponentModel.DescriptionAttribute[])
      f.GetCustomAttributes ( typeof(System.ComponentModel.DescriptionAttribute) , false ) ;

    hum [ Level ] = result = a [ 0 ].Description ;
  }

  return ( result ) ;
}

Testing:

C#

for ( int h = -5 ; h < 110 ; h += 5 )
{
  Humidity v = GetHumidityLevel ( h ) ;

  switch ( v )
  {
    default :
    {
      System.Console.WriteLine ( "{0} {1} {2}" , h , v , GetHumidityDescription ( v ) ) ;

      break ;
    }
  }
}

Submit it as your own work at your peril of course.

OriginalGriff · Answer 2 · 2020-10-27T12:54:00

The switch statement doesn't allow for multiple conditions, it only allows for case when the switch variable value exactly matches that specified in the case block.

You need to use if ... else if ... else instead:

C#

if (a <= 100 && a >= 80)
   {
   ...
   }
else if (a >= 50)
   {
   ...
   }
else
   {
   ...
   }

If your tutor has told you to use a switch and nothing else, then subtract one from the percentage (to bring all the values in to a range 20 to 39 instead of 21 to 40) then switch on that value divided by ten.
That will reduce it to 9 case statements and a default if you think about it for a minute or two.

Give it a try - it's not complicated!

Patrice T · Answer 3 · 2020-10-27T12:00:00

Solution 1

Rather than switch, think about if.
C# If ... Else[^]
[Update]

Quote:
As I said I have to use switch. It is just homework but I'm wondering how can I solve this way...

a case can handle only 1 value, so 1 case per value.

C#

switch (value1)
{
    case 1:
    case 2:
    case 3:
        Console.WriteLine("too dry!");
        break;
    ...
}

Posted 27-Oct-20 12:00pm

Patrice T

Updated 27-Oct-20 17:47pm

v3

Comments

PIEBALDconsult 27-Oct-20 18:13pm

Ummm... it's a class assignment?

Patrice T 27-Oct-20 18:26pm

probably :)

Member 14976913 27-Oct-20 18:47pm

As I said I have to use switch. It is just homework but I'm wondering how can I solve this way...

BillWoodruff 28-Oct-20 4:45am

Hi, Patrice, both C#7/8 offer ways to switch on ranges.

Patrice T 28-Oct-20 5:22am

I have not seen this syntax.

BillWoodruff 28-Oct-20 5:33am

Then you haven't looked :)

Patrice T 28-Oct-20 8:02am

I only loked there C# Switch[^]

BillWoodruff 28-Oct-20 10:27am

do not expand thy search criteria, and thou shalt not find ? :)

Richard MacCutchan 28-Oct-20 10:44am

I just found the reference on MSDN. I need to lie down in a dark room for a while.

BillWoodruff 28-Oct-20 11:17am

"oh brave new world:" https://stackoverflow.com/a/61503679/133321

List<int> oneToThree = new List<int>() { 1, 2, 3 };

int GetValue(int val) => val switch
{
_ when oneToThree.Contains(val) => DoSomeStuff(),
_ when val == 4 || val == 5 || val == 6 => DoSomeDifferentSwitch(),
_ => DefaultSwitch()
};

Richard MacCutchan 28-Oct-20 11:41am

Bleurgh!

How can I use switch-case in this way?

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