3.8 How to read data from a file?

A. Introduction A function can take a 1-D or 2-D array as input and manipulate the data elements. Once the function finishes processing, how to return the new array back to the caller? B. How to reflect a 2-D array vertically as shown below? i.e. turn A into B by moving the top row to the bottom, 2nd row to the 2nd but last... etc? class Reflect2DArray { public static int[][] verticalReflect(int[][] arrayX){ // Swap rows up and down int[][] temp = new int[arrayX.length][arrayX[0].length]; for (int row = 0; row < arrayX.length; row++) for (int col = 0; col < arrayX[0].length; col++) temp[arrayX.length - row -1][col] = arrayX[row][col]; return temp; } public static void print2DArray(int[][] arrayX){ for(int[] s:arrayX){ for(int sp: s) System.out.print(sp + " "); System.out.println(); } } public static void main(String[] args) { int[][] speed = { {99, 42, 74, 83, 100}, {90, 91, 72, 88, 95},{88, 61, 74, 89, 96}, {61, 89, 82, 98, 93}, {93, 73, 75, 78, 99},{50, 65, 92, 87, 94}, {43, 98, 78, 56, 99} }; int[][] vReflect = verticalReflect(speed); print2DArray(speed); print2DArray(vReflect); } } C. Try: Create a function that rotates the elements of a 1-D array by one position, moving the initial element to the end of the array, as shown at right.

A. Introduction The output of a function is the "returned" value. When defining the function, we have to specify the type of values returned. A function can either return a single value or an array. B. What does a function return? The return type of a method indicates the type of value that the method sends back to the calling location A method that does not return a value has a void return type. The return statement specifies the value that will be returned. For example, C. Try: create a function to return the average values of an array

A. Introduction A function is essentially similar to a machine that turns input into output. So getting input is important. Parameters of a function are inputs. How are parameters passed to a function? B. Watch ( PPT ) C. Try: Create a function to return the maximum value of an int array