CODEWITHSUNDEEP
c#arraysstringdoubleoutput
Peat
Peat

Reputation: 25

C# convert string array output to double

I am trying to take output from an array and convert to a double for use in a calculation.

This is what I am trying to do: 

Console.WriteLine(product[1]);
double units = Convert.ToDouble(Console.ReadLine());

Have been trying few other thing but getting no where; any easy solution?

Upvotes: 0

Views: 741

Answers (5)

Yogster
Yogster

Reputation: 914

If you need to convert the whole array to doubles, you could do this:

using System.Linq;

var doubleProduct = product.Select(p => double.Parse(p)).ToArray();

Edit

You can also use Array.ConvertAll() which is apparently more efficient (Thanks @PetSerAl for the tip). It also means you don't need Linq:

var doubleProduct = Array.ConvertAll(product, p => double.Parse(p));

Upvotes: 2

SHEKHAR SHETE
SHEKHAR SHETE

Reputation: 6066

Please try folllowing:

using System;

public class Program
{
    public static void Main()
    {
        string[] products= { "10.5","20.5","50.5"};
        foreach (var product in products)
        {
             Console.WriteLine(Convert.ToDouble(product));
        }           
    }
}

Live Demo

Upvotes: 0

faby
faby

Reputation: 7556

your line could be throw exception if the user type some invalid double

double units = Convert.ToDouble(Console.ReadLine());

you should do this

double units ;
if (!double.TryParse(Console.ReadLine(), out units )) {
    //units is not a double
}
else{
  //units is a double
}

Upvotes: 2

Taras Kovalenko
Taras Kovalenko

Reputation: 2393

using System;

public class Example
{
   public static void Main()
   {
      string[] values= { "-1,035.77219", "1AFF", "1e-35", 
                         "1,635,592,999,999,999,999,999,999", "-17.455", 
                         "190.34001", "1.29e325"};
      double result;

      foreach (string value in values)
      {
         try {
            result = Convert.ToDouble(value);
            Console.WriteLine("Converted '{0}' to {1}.", value, result);
         }   
         catch (FormatException) {
            Console.WriteLine("Unable to convert '{0}' to a Double.", value);
         }               
         catch (OverflowException) {
            Console.WriteLine("'{0}' is outside the range of a Double.", value);
         }
      }       
   }   
}
// The example displays the following output:
//       Converted '-1,035.77219' to -1035.77219.
//       Unable to convert '1AFF' to a Double.
//       Converted '1e-35' to 1E-35.
//       Converted '1,635,592,999,999,999,999,999,999' to 1.635593E+24.
//       Converted '-17.455' to -17.455.
//       Converted '190.34001' to 190.34001.
//       '1.29e325' is outside the range of a Double.

Read MSDN

Console.WriteLine Method (String, Object)

Console.ReadLine Method

Upvotes: 1

Dan
Dan

Reputation: 543

There's no need to write it to console and read it back.. simply:

var units = Convert.ToDouble(product[1]);

You might also consider using Double.TryParse() to check whether the value can be converted into a double and isn't a string of letters.

Upvotes: 2

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