Two Dimensional Arrays
This chapter expands our discussion on one-dimensional arrays to two dimensional arrays. A two dimensional array is a data structure that contains a collection of cells laid out in a two dimensional grid, similar to a table with rows and columns although the values are still stored linearly in memory. Each cell in a two dimensional array can be accessed through two indexes that specify the row number and column number respectively. Like s one dimensional array, the range of each index is from zero to the size of the row or column minus one. A nested for loop is commonly used to initialize, manipulate, and access the values in a two dimensional array.
14. Printing a 2D Array
Answer:
- How many rows must be printed?
- 3
- How many cells in each row must be printed?
- 3 for row 0
- 2 for row 1
- 5 for row 3
Printing a 2D Array
Here is a program that creates a 2D array, then prints it out.
The nested loops are written to print out the correct number of cells for each row. The expression uneven[row].length evaluates to a different integer for each row of the array.
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Question 14:
For the print method to work, must every row of uneven
be non-null
?