Log out Go to App
Go to App

Learning Materials

Features

Discover

Chapter 7: Problem 8

Write Java statements to accomplish each of the following tasks: a) Display the value of element 6 of array \(f\) b) Initialize each of the five elements of one-dimensional integer array g to 8 c) Total the 100 elements of floating-point array \(c\) d) Copy 11 -element array a into the first portion of array \(b\), which contains 34 elements. e) Determine and display the smallest and largest values contained in 99 -element floating point array w.

Short Answer

Expert verified
System.out.println(f[5]); | for(int i = 0; i < g.length; i++) { g[i] = 8; } | float sum = 0; for(int i = 0; i < c.length; i++) { sum += c[i]; } | System.arraycopy(a, 0, b, 0, 11); | float min = w[0], max = w[0]; for (int i = 1; i < w.length; i++) { if(w[i] < min) min = w[i]; if(w[i] > max) max = w[i]; } System.out.println('Smallest: ' + min + ', Largest: ' + max);

Step by step solution

01

Display Value of Array Element

To display the value of the 6th element in an array called 'f', you would use the following Java statement, remembering that Java array indices start at 0: System.out.println(f[5]);
02

Initialize Array Elements

To initialize each element of a one-dimensional integer array 'g' with five elements to 8, use a for loop: for(int i = 0; i < g.length; i++) { g[i] = 8; }
03

Total Elements of an Array

To total the elements of a floating-point array 'c' with 100 elements, you would use a loop to iterate and sum them: float sum = 0; for(int i = 0; i < c.length; i++) { sum += c[i]; }
04

Copy Array Elements

To copy 11 elements from array 'a' to array 'b', ensure 'b' has at least 11 elements. Use System.arraycopy: System.arraycopy(a, 0, b, 0, 11);
05

Find Smallest and Largest Array Values

To find the smallest and largest values in a 99-element float array 'w', perform a loop to compare each element: float min = w[0], max = w[0]; for (int i = 1; i < w.length; i++) { if(w[i] < min) min = w[i]; if(w[i] > max) max = w[i]; } System.out.println('Smallest: ' + min + ', Largest: ' + max);

Unlock Step-by-Step Solutions & Ace Your Exams!

  • Full Textbook Solutions

    Get detailed explanations and key concepts

  • Unlimited Al creation

    Al flashcards, explanations, exams and more...

  • Ads-free access

    To over 500 millions flashcards

  • Money-back guarantee

    We refund you if you fail your exam.

Start your free trial

Over 30 million students worldwide already upgrade their learning with Vaia!

Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Java for loop
In Java, a for loop is a control flow statement that allows repeated execution of a block of code. For loops are essential for iterating over arrays and collections to perform operations on each element. The syntax is for (initialization; termination; increment) { statement(s) }. When it comes to array manipulation, a for loop is often used to initialize array elements, sum values, or perform searches, as seen in the example where each element of array g is initialized to 8:
for(int i = 0; i < g.length; i++) {
g[i] = 8;
}
This effectively sets all elements of the array to a specific value. The use of g.length here ensures that the loop runs exactly as many times as there are elements in the array, preventing any IndexOutOfBoundsExceptions.
System.arraycopy in Java
The System.arraycopy method in Java is a built-in way to efficiently copy elements from one array to another. It is much faster than manually copying using a loop because it uses native system code. The method requires five parameters: System.arraycopy(src, srcPos, dest, destPos, length). Here, src is the source array, srcPos is the starting position in the source array, dest is the destination array, destPos is the starting position in the destination data, and length is the number of array elements to copy. For example, to copy the first 11 elements of array a into array b, the method call would look like:
System.arraycopy(a, 0, b, 0, 11);
This method is a handy way to copy arrays or subarrays within Java programs efficiently.
Finding minimum and maximum in an array
Finding the minimum and maximum values in an array involves iterating through the array elements and comparing them. In Java, this can typically be done with a for loop, checking each element against the current minimum and maximum and updating these values accordingly. The initial values of min and max are set to the first element of the array, as this ensures that the values are correctly updated even if all elements are negative or if there's a tie:
float min = w[0], max = w[0];
for (int i = 1; i < w.length; i++) {
if(w[i] < min) min = w[i];
if(w[i] > max) max = w[i];
}
After the loop completes, min and max hold the smallest and largest values, respectively. This method of finding minimum and maximum values is known as a linear search because it requires a scan through all elements in the array.

One App. One Place for Learning.

All the tools & learning materials you need for study success - in one app.

Get started for free

Most popular questions from this chapter

(Total Sales) Use a two-dimensional array to solve the following problem: A company has four salespeople \((1 \text { to } 4)\) who sell five different products \((1 \text { to } 5) .\) Once a day, each salesperson passes in a slip for each type of product sold. Each slip contains the following: a) The salesperson number b) The product number c) The total dollar value of that product sold that day Thus, each salesperson passes in between 0 and 5 sales slips per day. Assume that the information from all the slips for last month is available. Write an application that will read all this information for last month's sales and summarize the total sales by salesperson and by product. All totals should be stored in the two- dimensional array sales. After processing all the information for last month, display the results in tabular format, with each column representing a salesperson and each row representing a particular product. Cross-total each row to get the total sales of each product for last month. Cross-total each column to get the total sales by salesperson for last month. Your output should include these cross-totals to the right of the totaled rows and to the bottom of the totaled columns.

7.38 (Polling) The Internet and the web are enabling more people to network, join a cause, voice opinions, and so on. The presidential candidates in 2008 used the Internet intensively to get out their messages and raise money for their campaigns. In this exercise, you'll write a simple polling program that allows users to rate five social-consciousness issues from 1 (least important) to 10 (most important). Pick five causes that are important to you (e.g., political issues, global environmental issues \() .\) Use a one-dimensional array topics (of type String) to store the five causes. To summarize the survey responses, use a 5 -row, 10 -column two-dimensional array responses (of type int \(),\) each row corresponding to an element in the topics array. When the program runs, it should ask the user to rate each issue. Have your friends and family respond to the survey. Then have the program display a summary of the results, including: a) \(A\) tabular report with the five topics down the left side and the 10 ratings across the top, listing in each column the number of ratings received for each topic. b) To the right of each row, show the average of the ratings for that issue. c) Which issue received the highest point total? Display both the issue and the point total. d) Which issue received the lowest point total? Display both the issue and the point total.

(Airline Reservations System) A small airline has just purchased a computer for its new automated reservations system. You've been asked to develop the new system. You're to write an application to assign seats on each flight of the airline's only plane (capacity: 10 seats). Your application should display the following alternatives: Please type 1 for First Class and Please type 2 for Economy. If the user types 1 , your application should assign a seat in the firstclass section (seats \(1-5\) ). If the user types 2 , your application should assign a seat in the economy section (seats \(6-10\) ). Your application should then display a boarding pass indicating the person's seat number and whether it's in the first-class or economy section of the plane. Use a one- dimensional array of primitive type boolean to represent the seating chart of the plane. Initialize all the elements of the array to false to indicate that all the seats are empty. As each seat is assigned, set the corresponding element of the array to true to indicate that the seat is no longer available. Your application should never assign a seat that has already been assigned. When the economy section is full, your application should ask the person if it's acceptable to be placed in the first-class section (and vice versa). If yes, make the appropriate seat assignment. If no, display the message "Next flight Teaves in 3 hours." Use a one-dimensional array of primitive type boolean to represent the seating chart of the plane. Initialize all the elements of the array to false to indicate that all the seats are empty. As each seat is assigned, set the corresponding element of the array to true to indicate that the seat is no longer available.

Write statements that perform the following one-dimensional-array operations: a) Set the 10 elements of integer array counts to zero. b) Add one to each of the 15 elements of integer array bonus. c) Display the five values of integer array bestscores in column format.

a) False. An array can store only values of the same type. b) False. An array index must be an integer or an integer expression. c) For individual primitive-type elements of an array: False. A called method receives and manipulates a copy of the value of such an element, so modifications do not affect the original value. If the reference of an array is passed to a method, however, modifications to the array elements made in the called method are indeed reflected in the original. For individual elements of a reference type: True. A called method receives a copy of the reference of such an element, and changes to the referenced object will be reflected in the original array element. d) False. Command-line arguments are separated by white space.
See all solutions

Recommended explanations on Computer Science Textbooks

Computer Network

Read Explanation

Issues in Computer Science

Read Explanation

Theory of Computation

Read Explanation

Algorithms in Computer Science

Read Explanation

Big Data

Read Explanation

Data Structures

Read Explanation
View all explanations

What do you think about this solution?

We value your feedback to improve our textbook solutions.

Study anywhere. Anytime. Across all devices.

Sign-up for free