Chapter 7.4, Problem 7.13CP

Explanation of Solution

Passing arrays as an argument:

An array variable can be passed as argument to any method means passing the reference of array variable.

The method has direct access to actual array values because array always passed by reference, method which receives an array as an argument.

Use of ref or out keyword:

The ref or out keyword is used as parameter for method.

• • The receiving method not only has rights to access the array variable, but it also has rights to access the reference variable which was used to pass the array.

For example:

//Declare and initialize the array variable

int[] num = { 1, 2, 3 };

/*Call the displayNumber() method by passing the array variable as argument. */

displayNumber(num);

//Define the displayNumber() method

private void displayNumber(ref int[] a)

{

  //Make the "a" reference a different array size

a = new int[6];

        //The loop executes until the array value

        foreach (int i in a)

            //Display the array value in message box

            Messagebox...