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Chapter 8: Problem 20

To print out all elements of a two-dimensional array you would normally use a ______ loop.

Short Answer

Expert verified
Answer: The most common type of loop to use for iterating through all the elements of a two-dimensional array is nested `for` loops. To set up the loop structure, first create an outer loop that iterates through the rows using a variable (usually named `i`). Then, inside the outer loop, create an inner loop that iterates through the columns using another variable (typically named `j`). Finally, access and print the array element at the current row and column indices (i, j) inside the inner loop.

Step by step solution

01

Introduction

In order to iterate through all the elements in a two-dimensional array, we can use nested loops. The most commonly used loops in this case are `for` loops.
02

Outer Loop

Begin by setting up the outer loop. This loop will iterate through the rows of the two-dimensional array. The loop variable, usually named `i`, will represent the index of the current row. The loop will start at the index 0 (the first row) and continue until the end of the array (number of rows) is reached. Here's the outer loop: ``` for (int i = 0; i < numberOfRows; i++) { // Inner loop will go here } ```
03

Inner Loop

Now, we will create the inner loop within the outer loop. This inner loop will iterate through the columns of the current row, from index 0 to the end of the row (number of columns). The loop variable for the inner loop is typically named `j`. Add this inner loop inside the outer loop: ``` for (int i = 0; i < numberOfRows; i++) { for (int j = 0; j < numberOfColumns; j++) { // Printing of array elements will go here } } ```
04

Print Array Elements

Finally, we will access and print the array element at the current row and column indices (i, j) inside the inner loop. Make sure to use the loop variables `i` and `j` to index the array. Here's the full code for printing all elements of a two-dimensional array using nested `for` loops: ``` for (int i = 0; i < numberOfRows; i++) { for (int j = 0; j < numberOfColumns; j++) { System.out.print(array[i][j] + " "); } System.out.println(); // New line for separation between rows } ``` In conclusion, nested `for` loops are commonly used for iterating through all elements of a two-dimensional array and printing them out.

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Most popular questions from this chapter

Diagrams are an important means of clarifying many programming concepts. You have seen them used throughout this book to illustrate such things as how the flow of control works for various programming constructs, how a program is broken into modules and those modules related, how data is stored in memory, and how data is organized. Here is a set of declarations that define how the data for a set of poker hands is organized. Create a neat diagram that illustrates this organization. The diagram in Section 7.4 of Chapter 7 on nested structures might give you an idea of how to begin. struct CardStruct Int face: char suit: \(\quad / /\) 's' \(,\) 'h', 'd', or 'c' struct Playerstruct int playerNum; CardStruct card [5] P1ayerStruct player [4]

To pass an array to a function, pass the _______ of the array.

Look at the following array definition. double sales \([8][10]:\) A) How many rows does the array have? B) How many columns does the array have? C) How many elements does the array have? D) Write a statement that stores 3.52 in the last column of the last row in the array.

Look at the following array definition. int numbers \([5]=11,2,31\) A) What value is stored in numbers [2]\(?\) B) What value is stored in numbers [4]\(?\)

If the size declarator of an array definition is omitted, \(C++\) counts the number of items in the ______ to determine how large the array should be.
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