Chapter 13: Problem 74

include using namespace std; Class Moon; { Private; double earthWeight; double moonWeight; Public; moonWeight(double ew); { earthWeight = ew; moonWeight = ea… # #include using namespace std; Class Moon; { Private; double earthWeight; double moonWeight; Public; moonWeight(double ew); { earthWeight = ew; moonWeight = earthWeight / 6; } double getMoonWeight(); { return moonWeight; } } int main() { double earth; cout >> "What is your weight? "; cin << earth; Moon lunar(earth); cout << "On the moon you would weigh " <

Short Answer

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**Answer:** The purpose of the class Moon in this C++ program is to store a person's earth weight, calculate their weight on the moon, and provide a method to retrieve the calculated moon weight. An object of class Moon is created with the person's earth weight as an input, and the constructor calculates their moon weight. The getMoonWeight() function is then called to retrieve and display the person's calculated weight on the moon.

Step by step solution

Understand the Program Structure

The given code is a C++ program that calculates a person's weight on the moon. It uses a class named 'Moon' declaring private variables for Earth and Moon weights and functions to set the weights and fetch the moon weight.

Check for Syntax Issues

There are several syntax issues in the code that need to be fixed. We will correct those issues in the subsequent steps.

Fix Class Declaration

The class declaration should start with the keyword 'class', and the class name should be followed by the opening and closing brackets '{' and '}'. Here is the corrected class declaration: ```cpp class Moon { ```

Define Class Attributes

Define 'private' attributes, followed by their datatype and the attribute name. Here is the corrected class attribute definition: ```cpp private: double earthWeight; double moonWeight; ```

Create the Constructor

Declare the constructor and its functions inside the 'public' scope of the class. The corrected constructor declaration should look like: ```cpp public: Moon(double ew) { earthWeight = ew; moonWeight = earthWeight / 6.0; } ```

Define Getter Function

In the class, define a getter function to return the moon weight. The corrected function should look like: ```cpp double getMoonWeight() { return moonWeight; } ```

Implement the 'main' Function

Implement the 'main' function to get user input for the earth weight, create an object of the 'Moon' class and use the getter function to display the moon weight. The modified 'main' function should look like: ```cpp int main() { double earth; cout << "What is your weight? "; cin >> earth; Moon lunar(earth); cout << "On the moon you would weigh " << lunar.getMoonWeight() << endl; return 0; } ```

Final Program Code

After fixing the errors and explaining the steps, the final corrected code should look like: ```cpp #include using namespace std; class Moon { private: double earthWeight; double moonWeight; public: Moon(double ew) { earthWeight = ew; moonWeight = earthWeight / 6.0; } double getMoonWeight() { return moonWeight; } }; int main() { double earth; cout << "What is your weight? "; cin >> earth; Moon lunar(earth); cout << "On the moon you would weigh " << lunar.getMoonWeight() << endl; return 0; } ``` Now, the student should be able to understand the problem and the solution in a systematic way.

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Short Answer

Step by step solution

Understand the Program Structure

Check for Syntax Issues

Fix Class Declaration

Define Class Attributes

Create the Constructor

Define Getter Function

Implement the 'main' Function

Final Program Code

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