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chap08

README.md

Answers To Non-programming Exercises

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Exercise 8.1

Write a function that takes and returns an istream&. The function should read the stream until it hits end-of-file. The function should print what it reads to the standard output. Reset the stream so that it is valid before returning the stream.

Exer08_01.cpp

Exercise 8.2

Test your function by calling it, passing cin as an argument.

Exercise 8.3

What causes the following while to terminate?

while (cin >> i) /* ... */

Exercise 8.4

Write a function to open a file for input and read its contents into a vector of strings, storing each line as a separate element in the vector.

Exer08_04.cpp

Exercise 8.5

Rewrite the previous program to store each word in a separate element.

Exer08_05.cpp

Exercise 8.6

Rewrite the bookstore program from § 7.1.1 (p. 256) to read its transactions from a file. Pass the name of the file as an argument to main (§ 6.2.5, p. 218).

Exer08_06.cpp

Exercise 8.4

Write a function to open a file for input and read its contents into a vector of strings, storing each line as a separate element in the vector.

Exer08_07.cpp

Exercise 8.5

Rewrite the previous program to store each word in a separate element.

Exer08_08.cpp

Exercise 8.6

Rewrite the bookstore program from § 7.1.1 (p. 256) to read its transactions from a file. Pass the name of the file as an argument to main (§ 6.2.5, p. 218).

Exer08_09.cpp

Exercise 8.9

Use the function you wrote for the first exercise in § 8.1.2 (p.

  1. to print the contents of an istringstream object.

Exer08_10.cpp

Exercise 8.10

Write a program to store each line from a file in a vector. Now use an istringstream to read each element from the vector a word at a time.

Exer08_11.cpp

Exercise 8.11

The program in this section defined its istringstream object inside the outer while loop. What changes would you need to make if record were defined outside that loop? Rewrite the program, moving the definition of record outside the while, and see whether you thought of all the changes that are needed.

Exercise 8.12

Why didn’t we use in-class initializers in PersonInfo?

Exer08_13.cpp

Exercise 8.13

Rewrite the phone number program from this section to read from a named file rather than from cin.

Exercise 8.14

Why did we declare entry and nums as const auto &?