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Concept explainers
Two-dimensional array:
A two dimensional array is also called as a multi-dimensional array; a multidimensional array is that all the identical arrays are put together into a single array.
- This is useful for storing same type of multiple sets of data in same place.
- The main advantage is that one-dimensional array can hold only one set of value, whereas, two-dimensional array can hold multiple sets of data in the form of rows and columns.
- The structure of a multi-dimensional array is lookalike a table (that is combination of rows and columns); it contains same type of columns.
- The first size declarator in the two-dimensional array represents row and the second size declarator represents column.
- The two dimensional array can have multiple length fields, which holds the number of rows.
- Each row in the two dimensional array has a length field which holds the number of columns.
Syntax:
The syntax of two dimensional arrays is as follows:
datatype array_name [number_of_rows][number_of_columns];
From the given syntax, a two-dimensional array named “grades” of type “int” has been created with 30 rows and 10 columns.
Explanation of Solution
b. Code to sum all the elements in a column of 2D array and store it in a variable:
//Class definition
public class Sample {
// define main function
public static void main(String[] args) {
// Creation of 2D array with size declarator
int[][] days = new int[29][5];
// Declaration of accumulator variable
int total;
// Loop to read through the values in the column
for (int col = 0; col < 5; col++) {
// Initialize the accumulator variable
total = 0;
// Loop to read through each row
for (
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Chapter 7 Solutions
Starting Out with Java: Early Objects (6th Edition)
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