Arrays' initial value - how do you set it?!

Question

Assume an array: double[] array = new double[xy]; I know that the elements will be initialised to zero but I want to set every one of the array to a 'double.NaN'. I did initially try a foreach loop but the compiler complained. The only other way is two nested 'for' loops acting with x and y. Is there an easier way?

Simon · Answer

Nope doesn't work for me... I cannot find anything on the 'net or in msdn/help/microsoft/books that allows you to set a multi dimensioned array to one value in one line of code...I'll just have to write two 'for' loops :(

Simon · Answer

Stefan - that is so simple why didn't I think of that...! Thank you for your time and efforts - very appreciated :)

Stefan · Answer

Hello I figured out how to do this in a foreach loop. Here's how: int[] array = new int[2 3]; foreach (int index in array) { array[index index] = 10; } When I tested this I added each array object to a list box. When I ran the app the list box displayed the each object in the array all set to 10. Hope this helps!

Simon · Answer

This compiles and runs properly... #include stdafx.h #include int _tmain( int argc _TCHAR* argv[]) { float b[2][2] = {4.5}; for ( int i = 0; i for ( int j = 0; j std::cout 	 return 0; } I appreciate your help Stefan - thank you!

Stefan · Answer

You can't do this since you are using a multi-dimensional array. The example of a C++ array that you gave is a one-dimensional array.

Simon · Answer

No not quite. What I was after is that in C++ you can do this: float SomeArray[1000] = {9.5f}; And this sets all 1000 elements to the value of 9.5. What I would like to find out is if I can set a C# array in an equally easy manner - as the alternatives are either clumsy or not allowed by the compiler e.g. double [] SomeArray = new double[xy]; for( int i = 0; i for( int j = 0; j SomeArray[ij] = double.NaN; This is just clumsy in comparison to C++ whereas the code below isn't allowed: foreach (var a in double) { a = double.NaN; } What am I missing...?!

Stefan · Answer

Are you asking how to initialize a multi-dimensional array? If so you would do something like this: int [] rectangularArray = { {0 1 2} {3 4 5} {6 7 8} {9 10 11} }; This creates an array implies the size of the rows and columns and initializes the values. To read the values however you still need the nested for loops. I hope this is what you were looking for. If not please post back.