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Chapter 8: Problem 35

In a program you need to store the names and populations of 12 countries. Create an appropriate array to store this information and then write the code needed to read the information into the array from a file named pop.dat.

Short Answer

Expert verified
Answer: The information of 12 countries, including their names and populations, is being stored in an array containing 12 dictionaries. Each dictionary stores the name and population of one country. This data is then read from a file named 'pop.dat', and stored in the `country_data` array using the provided code snippet.

Step by step solution

01

Choose an appropriate data structure

In this exercise, we must store information about the name and population of each country. A suitable data structure to store this information is an array of dictionaries. Each dictionary will store the name and population of one country. There will be 12 dictionaries, one for each country.
02

Initialize the array

To store the information about 12 countries, we will create an empty array and then add 12 dictionaries to it. ```python country_data = [{} for i in range(12)] ```
03

Read data from the file

We will read data from a file named 'pop.dat' where each line will have the name of the country, followed by its population separated by a comma. The following code snippet will read the data from the file and store it in our `country_data` array. ```python with open("pop.dat", "r") as file: for i in range(12): line = file.readline() name, population = line.strip().split(",") # Store the data in the array country_data[i]["name"] = name country_data[i]["population"] = int(population) ``` Now the `country_data` array contains the information about 12 countries, with their names and populations read from the 'pop.dat' file.

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Most popular questions from this chapter

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

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.

To allow an array of structures or an array of objects to be initialized, the struct or class declaration should include a(n) ________.

Given the following array definition: \\[\text { Int values }[5]=(4,7,6,8,2)\\] What does the following statement display? $$\begin{array}{l} \text { cout }\langle\langle\text { values }[4] \ll x \quad \text { " }\langle\langle\quad \text { (values }[2]+\text { values }[3]) \\ \quad\langle\langle\quad \text { " } \quad \text { " } \quad\langle\langle\text { ++values }[1] \quad\langle\langle\text { end } 1 \end{array}$$

The ________ indicates the number of elements, or values, an array can hold.
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