Computer Science 2 Lab Exercises – 2D Arrays
You can use the below code as a starter. Use a separate copy for each exercise! It will fill a “square” array of size ARR_SIZE with random values from 1 to MAX_VALUE or you can fill the array with hard coded values of your choice or you can fill it any other way of your choosing.
public class Arrays2D
{
static final int ARR_SIZE = 10;
static final int MAX_VALUE = 1000;
public static void main(String[] args)
{
int[][] arr2D = new int[ARR_SIZE][ARR_SIZE];
for (int row=0; row<arr2D.length; row++) //loop fills the array
{
for (int col=0; col<arr2D[row].length; col++)
{
arr2D[row][col] = (int)(Math.random()*MAX_VALUE+1);
}
}
// ADD ALL OF YOUR INCREDIBLE AMAZING CODE HERE
printArr(arr2D); // calls printArr method to print the “after”
}//end main
public static void printArr(int[][] arrToPrint) //method prints array
{
for (int r=0; r<arrToPrint.length; r++)
{
for (int c=0; c<arrToPrint[r].length; c++)
{
if (arrToPrint[r][c] < 10)
System.out.print(" ");
if (arrToPrint[r][c] < 100)
System.out.print(" ");
System.out.print(arrToPrint[r][c]+" ");
} // end of row
System.out.println(); //change lines
}
}
} // end class
Exercise 0 --- Sum and Average
Add code to your main method to calculate and print the sum of all the array elements and the average of all the elements. For extra fun print the sum of each row and column individually.