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ConsoleWrite("Here is list: "); // now use Length to display list for(int i=0; i < listLength; i++) ConsoleWrite(list[i] + " "); ConsoleWriteLine(); } }
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This program displays the following output:
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length length length length length length length of of of of of of of list is 10 twoD is 12 nums is 3 table is 3 table[0] is 3 table[1] is 2 table[2] is 4
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Here is list: 0 1 4 9 16 25 36 49 64 81
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There are several points of interest in this program First, the length of list, which is a onedimensional array, is equal to its declared length of 10 Second, the length of twoD, a 3 by 4 two-dimensional array, is 12, which is the total number of elements that it contains In general, the length of a multidimensional array is equal to all of the elements that it can hold However, this situation is different for jagged arrays As you know, a jagged array is an array of arrays Therefore, in the program, table is a jagged array that has two dimensions Pay special attention to the way Length is used with it First, the expression
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tableLength
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obtains the number of arrays stored in table, which, in this case, is 3 To obtain the length of any individual array in table, use an expression such as this:
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table[0]Length
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which, in this case, obtains the length of the first array, which is 3 One other thing to notice in LengthDemo is the way that listLength is used by the for loops to govern the number of iterations that take place Since each array carries with it its own length, you can use this information rather than manually keeping track of an array s size Keep in mind that the value of Length has nothing to do with the number of elements that you are actually using It contains the number of elements that the array is capable of holding The inclusion of the Length property simplifies many algorithms by making certain types of array operations easier and safer to perform For example, the following program
5: More Data Types and Operators
uses Length to copy one array to another while preventing an array overrun and its attendant runtime exception:
// Use Length property to help copy an array using System; class ACopy { static void Main() { int i; int[] nums1 = new int[10]; int[] nums2 = new int[10]; for(i=0; i < nums1Length; i++) nums1[i] = i; // Copy nums1 to nums2 if(nums2Length >= nums1Length) for(i = 0; i < nums2Length; i++) nums2[i] = nums1[i]; for(i=0; i < nums2Length; i++) ConsoleWrite(nums2[i] + " "); } }
Confirm that the target array is large enough to hold all the elements from the source array
Here, Length helps perform two important functions First, it is used to confirm that the target array is large enough to hold the contents of the source array Second, it provides the termination condition of the for loop that performs the copy Of course, in this simple example, the size of the arrays is easily known, but this same approach can be applied to a wide range of more challenging situations
Create an Implicitly Typed Array
As explained in 2, C# 30 adds the ability to declare implicitly typed variables by the use of the var keyword These are variables whose type is determined by the compiler, based on the type of the initializing expression Thus, all implicitly typed variables must be initialized Using the same mechanism, it is also possible to create an implicitly typed array As a general rule, implicitly typed arrays are for use in certain types of queries involving LINQ, which is described later in this book In most other cases, you will use the normal array declaration approach Implicitly typed arrays are introduced here for completeness An implicitly typed array is declared using the keyword var, but you do not follow var with [ ] Furthermore, the array must be initialized It is the type of initializer that determines the element type of the array All of the initializers must be of the same or a compatible type Here is an example of an implicitly typed array:
var vals = new[] { 1, 2, 3, 4, 5 };
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