Homework help 1.Declare a two-dimensional array of ints named grades. It should

Question

Homework help

1.Declare a two-dimensional array of ints named grades.  It should have 30 rows and 10 columns.

int grades [30][10]

2.Home many total elements are in the following array? double sales[6][4];

Ten total elements?

3.Write a statement that assigns the value 56893.12 to the first column of the first row of the array declared in (2).

double sales[i][j]=56893.12;

4.Write a statement that displays the contents of the last column of the last row of the array declared in (2).

double sales[6][4];

5.Declare a 2-dimensional array named settings large enough to hold the table of information below. Initialize the array with the values below:

1st row:  12,24,32,21,42

2nd row: 14,67,87,65,90

3rd row:  19,1, 24,12,8

int settings [3][1]={12,24,32,21,42

14,67,87,65,90

19,1,24,12,8}

6.Write a function called displayArray. The function should accept a 2-dimensional array as an argument and display its contents on the screen. The function should work with any of the following arrays:

int hours[5][7];

int stamps[8][7];

int autos[12][7];

int cats[50][7];

Explanation / Answer

This is the solution

a) int grades[][]=new int[30][10];

b)in the array doule sales[6][4] no of rows=6 and no. of columns=4 so total elements =6*4=24

c)sales[0][0]=56893.12

d)System.out.println("The last element is"+sales[5][3]);

e)The array must have 3 rows and 5 columns to hold the table data so the array must be

int data[][]={{12,24,32,21,42},{14,67,87,65,90},{19,1, 24,12,8}}; is the solution

f)Here is the function with comments

public void displayArray(int[][] array) {
       // the length property gives the number of rows in the array and the
       // number of columns are equal to 7 as known to us
       for (int i = 0; i < array.length; i++) {
           for (int j = 0; j < 7; j++) {
               System.out.println(array[i][j]);
           }
           System.out.println();
       }
   }

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