How do I convert split string (string array) to double in C#?

Question

The question:

8 children's height is being checked, and inserted.
Insert 8 double values into the console, and make an algorithm to find out the lowest height & the maximum height.

So this is what I've done:

class work1 {
    public static void Main(String[] args) {
        string[] height = Console.ReadLine().Split(' ');
        double[] heightInDouble = new Double[height.Length];
        for (int i = 0; i <= height.Length; i++) {
            heightInDouble[i] = (double) height[i]; // line 20
        }

        Console.WriteLine("Highest: " + heightInDouble.Max() + " Lowest: " + heightInDouble.Min());
    }
}

The results:

Error: Cannot convert type 'string' to 'double' (20)

How can I convert a string to a double value?

You need to parse each string, e.g. with double.Parse or double.TryParse. Look into those methods and see if that helps you. Note that if they're meant to be integers (ints) it's odd to create a double array. I suggest you either change the name or the type. (Actually, I'd change the name anyway to show what they're meant to be: heights.) — Jon Skeet
– Jon Skeet, Commented Oct 20, 2013 at 17:30
The whole this is quite simpler with Linq, Console.ReadLine().Split(' ').Select(double.Parse); That's if you can trust your inputs. — nawfal
– nawfal, Commented Oct 20, 2013 at 17:35
@nawfal Good idea, but I must do it from my own knowledge, It was a simple problem in the Computer Science class — Jony Kale
– Jony Kale, Commented Oct 20, 2013 at 17:47

McGarnagle · Accepted Answer · 2013-10-20 17:36:03Z

3

You can't directly cast from string to double. Use double.Parse:

realInts[i] = double.Parse( ints[i] );

You may also want to use TryParse, as it's not certain here that the string is actually a number:

double parsedValue;
realInts[i] = double.TryParse(ints[i], out parsedValue) ? parsedValue : 0;

One more note: you could simplify the syntax by using a Linq expression chain:

double parsedVal;
double[] realInts = Console.ReadLine().Split(' ')
    .Select(str => double.TryParse(str, out parsedVal) ? parsedVal : 0)
    .ToArray();

edited Oct 20, 2013 at 17:36

answered Oct 20, 2013 at 17:31

McGarnagle

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1 Comment

Jony Kale Over a year ago

double.Parse() is an awesome solution, thanks. I always wondered with is the parse(), going to read more about it now.

Muhammad Umar · Accepted Answer · 2013-10-20 17:33:50Z

1

Try this.

static void Main(string[] args)
    {
        string[] ints = Console.ReadLine().Split(' ');
        double[] realInts = new Double[ints.Length];
        for (int i = 0; i <= ints.Length; i++)
        {
            double val;
            if (Double.TryParse(ints[i], out val))
            {
                realInts[i] = val; // line 20
            }
            else
            {
                // Unable to parse
                realInts[i] = 0;
            }

        }
    }

answered Oct 20, 2013 at 17:33

Muhammad Umar

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Comments

Mahmoud Hashim · Accepted Answer · 2013-10-22 07:47:03Z

0

use this code

class work1
{
    public static void Main(String[] args)
    {
        string[] height = Console.ReadLine().Split(' ');
        double[] heightInDouble = new Double[height.Length];
        for (int i = 0; i < height.Length; i++)
        {
            heightInDouble[i] = Convert.ToDouble(height[i]); // line 20
        }

        Console.WriteLine("Highest: " + heightInDouble.Max() + " Lowest: " + heightInDouble.Min());
        Console.ReadLine();
    }
}

answered Oct 22, 2013 at 7:47

Mahmoud Hashim

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