convert a double array to integer one

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Hello,I want to conver the array with type double to int;shoud I use a loop over the elements or there is a better way?what about coping two arrays of one type?thanks in advance

Posted 10-Aug-11 19:49pm

ready to learn

Updated 10-Aug-11 19:50pm

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walterhevedeich 11-Aug-11 1:52am

I guess you have to loop over the elements. Just curious, why would you want to do that? By converting it to int, you have decreased the precision of the data type.

ready to learn 11-Aug-11 1:54am

you are right.but I want to use that array to make a bitmap

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johannesnestler · Answer 1 · 2011-08-11T05:29:00

Hi,

there are many possible solutions for this. Here is one:

C#

public static int[] ConvertDoubleArrayToIntArray(double[] adDoubleArray)
{
     return adDoubleArray.Select(d => (int)d).ToArray();
}

and use like this:

C#

double[] adDoubleArray = { 1.1d, 2.2d, 3.3d, 4.4d, 5.5d };
int[] aiIntArray = ConvertDoubleArrayToIntArray(adDoubleArray);

Mohammad A Rahman · Answer 2 · 2011-08-10T21:04:00

Solution 2

It might be helpful,

Convert.ToInt32 [^]

an example,

static void Main(string[] args)
 {
     double[] myDoubleArray = { 114.4, 225.0, 11.7 };
     IList<Int32> myInt32List = new List<Int32>();
     Array.ForEach(myDoubleArray, item =>
     {
           myInt32List.Add(Convert.ToInt32(item));

      });
      Int32[] myInt32Array = myInt32List.ToArray();
 }

:)

Posted 10-Aug-11 21:04pm

Mohammad A Rahman

Comments

C_Johnson 20-Sep-11 16:57pm

Converting an integer to a double using Convert.ToInt32 is not a time efficient method. Although it does work it is not recommended, using a cast will do suffice e.g

myInt32List.Add((int)item);

This will allow the value to be directly copied to a new memory position. The reason you need to use the cast is because converting from double to a integer will cause a loss of data the cast says you accept this loss. The Convert.ToInt32 requires the data to be a transferred and operated on externally to produce the same results. In this case it is superfluous to the outcome.

Christian Graus · Answer 3 · 2011-08-10T19:51:00

Solution 1

I think you have no choice but to write some LINQ or a foreach to iterate over your list and convert one at a time.

Posted 10-Aug-11 19:51pm

Christian Graus