barcode vb.net source code illustrates using the params keyword. in Visual C#

Creator Code 128C in Visual C# illustrates using the params keyword.

Example 10-4 illustrates using the params keyword.
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10: Arrays
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using using using using System; System.Collections.Generic; System.Linq; System.Text;
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namespace Example_10_4_ _ _ _params_keyword { public class Tester { static void Main( ) { Tester t = new Tester( ); t.DisplayVals(5, 6, 7, 8); int[] explicitArray = new int[] { 1, 2, 3, 4, 5 }; t.DisplayVals(explicitArray); } public void DisplayVals(params int[] intVals) { foreach (int i in intVals) { Console.WriteLine("DisplayVals {0}", i); } } } }
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The output looks like this:
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DisplayVals DisplayVals DisplayVals DisplayVals DisplayVals DisplayVals DisplayVals DisplayVals DisplayVals 5 6 7 8 1 2 3 4 5
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Multidimensional Arrays
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If we simplify the mailbox analogy from earlier in the chapter, you can think of an array as a long row of slots into which you can place values. This single row of slots is called a one-dimensional array. Now imagine 10 rows of slots, stacked on top of each other. What you re picturing is a classic two-dimensional array of rows and columns. The rows run across the array and the columns run up and down the array, as shown in Figure 10-2.
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Multidimensional Arrays |
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Col 0 Row 1 Row 2 Row 3 Row 4 Row 5
Col 5
Col 10
Two-dimensional arrays aren t too hard to picture, but a third dimension is a bit harder to imagine, but still not too hard, if you remember your high school geometry. OK, now imagine four dimensions. Now imagine 10. Those of you who are not string-theory physicists have probably given up, as have we. Maybe we can t picture what 10-dimensional arrays look like, but that doesn t matter to C#. Multidimensional arrays can be useful, even if you can t quite picture them. C# supports two types of multidimensional arrays: rectangular and jagged. In a rectangular array, every row is the same length. A jagged array, however, is an array of arrays, each of which can be a different length.
Rectangular Arrays
A rectangular array is an array of two (or more) dimensions. In the classic twodimensional array, the first dimension is the number of rows and the second dimension is the number of columns. To declare a two-dimensional array, use the following syntax:
type [,] array name
For example, to declare and instantiate a two-dimensional rectangular array named myRectangularArray that contains two rows and three columns of integers, you would write:
int [,] myRectangularArray = new int[2,3];
To retrieve the value of the element in the second row and the first column, you d do something like this:
int myInt = myRectangularArray[1,0];
Remember that the indexes start at 0 for multidimensional arrays, too.
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10: Arrays
Two-dimensional arrays also work well with for loops, but to iterate over both dimensions, you need two for loops, one nested inside the other. For example, if you have a 4 3 array, you might populate it like this:
const int rows = 4; const int columns = 3; for ( int i = 0; i < rows; i++ ) { for ( int j = 0; j < columns; j++ ) { rectangularArray[i, j] = i + j; } }
Each time through the outer for loop, the inner loop iterates completely from j = 0 to j < columns, which fills one row of the two-dimensional array. Then i is incremented, j is reset to 0, and it starts over again. Example 10-5 declares, instantiates, initializes, and prints the contents of a twodimensional array. In this example, a for loop is used to initialize the elements of the array.
using using using using System; System.Collections.Generic; System.Linq; System.Text;
namespace Example_10_5_ _ _ _Rectangular_array { public class Tester { static void Main( ) { const int rows = 4; const int columns = 3; // declare a 4x3 integer array int[,] rectangularArray = new int[rows, columns]; // populate the array for (int i = 0; i < rows; i++) { for (int j = 0; j < columns; j++) { rectangularArray[i, j] = i + j; } } // report the contents of the array
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