2-D Arrays Worksheet Java
1. Write the statements needed to declare and load the following arrays.
2 4 1 5 2 7
A = 6 9 7 8 B = 3 7 9 C = 6 3
0 3 2 8 1 4 8 0 4
2. Use the arrays of question number 1 to answer the following question. What is the value of
(a) A[1,2] (b) C[2,1] (c) B[0,2] (d) C[1, 2]
Trace each of the following program segments showing a neat iteration table and the output window.
3.
int[][] Q = new int[2][4];
for (int i = 0; i < 2; i++)
for (int j = 0; j < 4; j++)
Q[i][j] = i*j;
for (int i = 0; i < 2; i++) {
for (int j = 0; j < 4; j++)
System.out.print(Q[i][j] + "^^");
System.out.println();
}
4.
int [][] nums = new int[2][2];
int r, c;
for (r = 1; r >= 0; r--)
for (c = 0; c < 2; c++)
nums[r][c] =Console.in.readInt();
for (r = 0; r < 3; r++)
System.out.println(nums[r][1]);
data
6 9 0 –4 5 -2
5. Write a method FlipArray that imports array M on the left and converts it to, and returns, array N on the
right. Array M must remain unchanged.
2 5 4 7
M = 3 1 2 9
4 6 3 0
2 3 4
N = 5 1 6
4 2 3
7 9 0
6. Write a method SumOfRows that will will import array M above and print the following output.
Row^^^^^^Sum of Row
1 18
2 15
3 13
7. Write a method SumOfCols that will import array M from #5 and print the following output.
Column^^^^Sum of Column Entries
1 9
2 12
3 9
4 16
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Copyright 2003, Louis Trentini. All rights reserved.
