Numbers in range c#

[Daniboi]

Hi, i have wrote a piece of code however i cant remember how you get some data validation in. i want my numbers to stay within -10 and +10 and it should the display "invalid answer" and then ignore that user input however it just says in valid answer.

 

      bool bUserInput;
            sbyte sbNumber;

   
   if (sbNumber < -11 || sbNumber > 11)
                {
                    //the error message
                    Console.WriteLine("Your are out of range please stay between -10 and +10");

                    bUserInput = false;
                }

 

[Ecchi]

Errm.... Your question doesn't really make sense. But I believe the answer your looking for it the method int.TryParse(). Make sbNumber into an int not a sbyte.

 

 

This documentation should help you with it. If you have any more questions feel free to ask!

https://docs.microsoft.com/en-us/dotnet/api/system.int32.tryparse?view=netframework-4.8

 

[minibois]

if(number > 11)

Means number 11 will be the maximum allowed number. Same for the -11 if-statement you're running.

You're probably looking for >= / <= or simply if(number > 10).

 

I can't remember if sbyte can be compared to an int too, so be sure to double check that part too.

[Daniboi]

1 hour ago, Ecchi said:

Errm.... Your question doesn't really make sense. But I believe the answer your looking for it the method int.TryParse(). Make sbNumber into an int not a sbyte.

 

 

This documentation should help you with it. If you have any more questions feel free to ask!

https://docs.microsoft.com/en-us/dotnet/api/system.int32.tryparse?view=netframework-4.8

 

hi,

 

yeah so i am trying to make sure that it stays within range of those numbers like the flowchart seen bellow

[Ecchi]

5 minutes ago, Daniboi said:

 

Hi,

 

This piece of code should work.

 

using System;

public class Program
{
	public static void Main()
	{
		Console.WriteLine("Number: ");
		string number = Console.ReadLine();
		bool UserInput;
		int realNum;
		
		if (int.TryParse(number, out realNum))
		{
			if (realNum <= -10 || realNum >= 10)
			{
				//the error message
				Console.WriteLine("Your are out of range please stay between -10 and +10");
				UserInput = false;
			}
		}
	}
}

 

Hope this makes sense.

[Daniboi]

Just now, Ecchi said:

Hi,

 

This piece of code should work.

 

using System;

public class Program
{
	public static void Main()
	{
		Console.WriteLine("Number: ");
		string number = Console.ReadLine();
        //hate to ask but the use of string? why?
        
		bool UserInput;
		int realNum;
		
		if (int.TryParse(number, out realNum))
		{
			if (realNum <= -10 || realNum >= 10)
			{
				//the error message
				Console.WriteLine("Your are out of range please stay between -10 and +10");
				UserInput = false;
			}
		}
	}
}

 

Hope this makes sense.

it sorta does

[straight_stewie]

26 minutes ago, Daniboi said:

it sorta does

 

public class Program
{
  static void Main()
  { 
    Console.WriteLine("Please enter a number in the range [-10, 10]");
    int userNum;
    
    while (true)
    {
      string userInput = Console.ReadLine();
      
      if (Int32.TryParse(userInput, out userNum))
      {
        if (InputIsInRange(userNum, -10, 10))
          break;
        
        else
          Console.WriteLine("Invalid Number");
      }
      
      else
        Console.WriteLine("Input is not a number. Please input a number between -10 and 10.");
    }
    
    // If we're here, we're clear to do stuff with userNum.
  }
  
  bool InputIsInRange(int num, int lowerInclusive, int upperInclusive) => ((num >= lowerInclusive) && (num <= upperInclusive));
}

This appears to be homework. I would not recommend copying my use of expression bodied members (the "=>" syntax on the InputIsRange declaration) because it may raise a red flag to your teacher.

[fringie]

On 1/3/2020 at 5:31 PM, straight_stewie said:

 

public class Program
{
  static void Main()
  { 
    Console.WriteLine("Please enter a number in the range [-10, 10]");
    int userNum;
    
    while (true)
    {
      string userInput = Console.ReadLine();
      
      if (Int32.TryParse(userInput, out userNum))
      {
        if (InputIsInRange(userNum, -10, 10))
          break;
        
        else
          Console.WriteLine("Invalid Number");
      }
      
      else
        Console.WriteLine("Input is not a number. Please input a number between -10 and 10.");
    }
    
    // If we're here, we're clear to do stuff with userNum.
  }
  
  bool InputIsInRange(int num, int lowerInclusive, int upperInclusive) => ((num >= lowerInclusive) && (num <= upperInclusive));
}

This appears to be homework. I would not recommend copying my use of expression bodied members (the "=>" syntax on the InputIsRange declaration) because it may raise a red flag to your teacher.

And they usually have software to check if it's plaguerised, plus it's not really learning if copy/paste without understanding it

[Daniboi]

10 hours ago, fringie said:

And they usually have software to check if it's plaguerised, plus it's not really learning if copy/paste without understanding it

ah no so they actually told me to it this way

[Daniboi]

10 hours ago, Erik Sieghart said:

There's some fundamental understanding issues with your code. I would read @straight_stewie's code to reference the individual parts that are different from yours. These misunderstandings are:

• The use of sbyte instead of int.
• Not obtaining the input from the user.
• Believing that the input can be stored as an integer.

so i was told sbyte and this is only a very small bit of my code

[fringie]

On 1/5/2020 at 5:35 AM, Erik Sieghart said:

There's some fundamental understanding issues with your code. I would read @straight_stewie's code to reference the individual parts that are different from yours. These misunderstandings are:

• The use of sbyte instead of int.
• Not obtaining the input from the user.
• Believing that the input can be stored as an integer.

Don't associate me without that code