Programming Quiz 13.2: Question 1: 00000-11075

Chapter 13 Programming Quiz 13.2: Question 1: (00000-11075) Given a bool variable isReadable, write some statements that assign true to isReadable if the file "topsecret" exists and can be read by the program and assigns false to isReadable otherwise.ifstream infile; infile.open("topsecret"); isReadable = !infile.fail(); Programming Quiz 13.2: Question 2: (00000-11076) Given an int variable x, write some statements that attempt to open a file named "table20" and read a value into x; if that turns out not to be possible, your code should then read a value from console input into x.ifstream infile; infile.open("table20"); if (infile.fail()) cin >> x; else infile >> x; Programming Quiz 13.2: Question 3: (00000-11125) Given the availability of an ofstream object named output and a string variable name tweet, write the statements to open a file named "mytweet", display the prompt tweet: and then read an entire line into tweet and then write it out to the file mytweet.output.open("mytweet");

cout << "tweet:";

getline(cin, tweet); output << tweet << endl; output.close(); Programming Quiz 13.2: Question 4: (00000- 11126) Given the availability of a file named numbers, write the statements to read an int from standard input and then read in that many values from numbers and display their total.ifstream infile; infile.open("numbers"); int total = 0; int n, x; cin >> n; for (int i = 0; i < n; i++) { infile >> x; total += x; } cout << total << endl;

Solutions Manual Part 1:

Chapter 13-27 Solu tions Manual for Introduction to C++ Programming and Data Structures 5th Edition By Daniel Liang

Part 1: Chapter

13-27

Part 2: Ch

apter 1-12 1 / 4

Programming Quiz 13.4: Question 1: (00000-11032) A variable c of type char has been declared. Write the code to read in the next character from standard input and store it in c, regardless of whether it is a whitespace character.cin.get(c);

Programming Quiz 13.4: Question 2: (00000-11033) Declare a string named line and write a statement that reads in the next line of console input into this variable.

string line; getline(cin, line);

Chapter 13: Programming Project 1: (345021- 00054)

(Process scores in a text file)

Suppose that a text file Exercise13_3.txt contains an unspecified number of scores. Write a program that reads the scores from the file and displays their total and average. Scores are separated by blanks.

For a hint on this program, please see https://liangcpp.pearsoncmg.com/cpprevel2e.html. If you get a logic or runtime error, please refer to https://liangcpp.pearsoncmg.com/faq.html.

#include #include using namespace std;

int main() { ifstream input;

// Open a file input.open("Exercise13_3.txt");

if (input.fail()) { cout << "File does not exist" << endl; cout << "Exit program" << endl; return 0; }

double number = 0; double total = 0; int count = 0; while (!input.eof()) // Continue if not end of file { input >> number; total += number; count++; }

input.close();

cout << "Total is " << total << endl; 2 / 4

cout << "Average is " << total / count << endl; return 0; }

Chapter 13: Programming Project 2: (345021- 00055)

(Create a text file)

Write a program to create a file named Exercise13_1.txt if it does not exist. If it does exist, append new data to it. Write 100 integers 0 to 99 into the file using text I/O. Integers are separated by a space.

For a hint on this program, please see https://liangcpp.pearsoncmg.com/cpprevel2e.html. If you get a

logic or runtime error, please refer https://liangcpp.pearsoncmg.com/faq.html

.

#include #include using namespace std;

int main() { ofstream output;

// Create a file output.open("Exercise13_1.txt", ios::out | ios::app);

for (int i = 0; i < 100; i++) { output << i << " "; }

output.close();

cout << "Done" << endl;

return 0; }

Chapter 14 Programming Quiz 14.8: Question 1: (00000-11220)

Define and implement the following Window class:

• int data members, width and height.
• a constructor that accepts two int parameters (width followed by height) and uses them to

initialize the data members.

• a friend function, areSameSize, that accepts two Window objects and returns a bool indicating if

they are of the same size. Two Window objects are of the same size if their widths and heights match.

class Window {

public:

Window(int width, int height): width(width), height(height) {}

friend bool areSameSize(const Window& w1, const Window& w2) { return w1.width == w2.width && w1.height == w2.height;

} 3 / 4

private:

int width, height; };

Programming Quiz 14.9: Question 1: (00000-11226) Assume the existence of a Window class with int data members width and height.

Overload the << operator for the Window class-- i.e.,

write a nonmember ostream- returning function that accepts a reference to an ostream object and a

constant reference to a Window object and sends the following to the ostream:

'a (width x height) window' (without the quotes and with width and height replaced by the actual width and height of the window.

Thus for example, if the window had width=80 and height=20, << would send 'a (80 x 20) window' to the ostream.

Don't forget to have the function return the proper value as well.

Note: The Window class is already in place. Declare and implement a friend << operator function inside the Window class.

friend ostream& operator<<(ostream& os, const Window& window) { os << "a (" << window.width << " x " << window.height << ") window"; return os; }

Programming Quiz 14.9: Question 2: (00000-11227) Assume the existence of a Window class with int data members width and height.

Overload the >> operator for the Window class-- i.e., write a nonmember istream- returning function that accepts a reference to an istream object and a reference to a Window object and reads the next two values from the istream into the width and height members respectively.

Note: The Window class is already in place. Declare and implement a friend << operator function inside the Window class.

friend istream& operator>>(istream& is, Window& window) { is >> window.width >> window.height; return is; }

Chapter 14: Programming Project 1: (345021- 00168)

(Math: The Complex class)

The description of this project is given in Programming Exercise 14.7 in the Chapter 14 Programming Exercise from the Book section.

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