Starting Out with C++: Early Objects
8th Edition
ISBN: 9780133360929
Author: Tony Gaddis, Judy Walters, Godfrey Muganda
Publisher: Addison-Wesley
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Textbook Question
Chapter 7, Problem 5PC
Population
In a population, the birth rate and death rate are calculated as follows:
Birth Rate = Number of Births ÷ Population
Death Rate = Number of Deaths ÷ Population
For example, in a population of 100,000 that has 8,000 births and 6,000 deaths per year,
Birth Rate = 8,000 ÷ 100,000 = 0.08
Death Rate = 6,000 ÷100,000 = 0.06
Design a Population class that stores a current population, annual number of births, and annual number of deaths for some geographic area. The class should allow these three values to be set in either of two ways: by passing arguments to a three-parameter constructor when a new Population object is created or by calling the setPopulation, setBirths, and setDeaths class member functions. In either case, if a population figure less than 2 is passed to the class, use a default value of 2. If a birth or death figure less than 0 is passed in, use a default value of 0. The class should also have getBirthRate and getDeathRate functions that compute and return the birth and death rates. Write a short program that uses the Population class and illustrates its capabilities.
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Chapter 7 Solutions
Starting Out with C++: Early Objects
Ch. 7.5 - Which of the following shows the correct use of...Ch. 7.5 - An objects private member variables can be...Ch. 7.5 - Assuming that soap is an instance of the Inventory...Ch. 7.5 - Complete the following code skeleton to declare a...Ch. 7.7 - Briefly describe the purpose of a constructor.Ch. 7.7 - Constructor functions have the same name as the A)...Ch. 7.7 - A constructor that requires no arguments is called...Ch. 7.7 - Assume the following is a constructor: ClassAct: :...Ch. 7.7 - Prob. 7.9CPCh. 7.7 - True or false: A class may have a constructor with...
Ch. 7.7 - A destructor function name always starts with A) a...Ch. 7.7 - True or false: Just as a class can have multiple...Ch. 7.7 - What will the following program code display on...Ch. 7.7 - What will the following program code display on...Ch. 7.9 - 7.15 private class member function can be called...Ch. 7.9 - When an object is passed to a function, a copy of...Ch. 7.9 - If a function receives an object as an argument...Ch. 7.9 - Prob. 7.18CPCh. 7.9 - Prob. 7.19CPCh. 7.10 - Prob. 7.20CPCh. 7.10 - Write a class declaration for a class named...Ch. 7.10 - Write a class declaration for a class named Pizza...Ch. 7.10 - Write four lines of code that might appear in a...Ch. 7.11 - Assume the following class components exist in a...Ch. 7.11 - What header files should be included in the client...Ch. 7.12 - Write a structure declaration for a structure...Ch. 7.12 - Prob. 7.27CPCh. 7.12 - Prob. 7.28CPCh. 7.12 - Write a declaration for a structure named...Ch. 7.12 - Write a declaration for a structure named City,...Ch. 7.12 - Write assignment statements that store the...Ch. 7.12 - Prob. 7.32CPCh. 7.12 - Write a function that uses a Rectangle structure...Ch. 7.12 - Prob. 7.34CPCh. 7.15 - Prob. 7.35CPCh. 7.15 - When designing an object -oriented application,...Ch. 7.15 - How do you identify the potential classes in a...Ch. 7.15 - What two questions should you ask to determine a...Ch. 7.15 - Look at the following description of a problem...Ch. 7 - Prob. 1RQECh. 7 - Which of the following must a programmer know...Ch. 7 - Prob. 3RQECh. 7 - ______programming is centered around functions, or...Ch. 7 - An object is a software entity that combines both...Ch. 7 - An object is a(n) ______ of a class.Ch. 7 - Prob. 7RQECh. 7 - Once a class is declared, how many objects can be...Ch. 7 - An objects data items are stored in its...Ch. 7 - The procedures, or functions, an object performs...Ch. 7 - Bundling together an objects data and procedures...Ch. 7 - An objects members can be declared public or...Ch. 7 - Normally a classs _________ are declared to be...Ch. 7 - A class member function that uses, but does not...Ch. 7 - A class member function that changes the value of...Ch. 7 - When a member functions body is written inside a...Ch. 7 - A class constructor is a member function with the...Ch. 7 - A constructor is automatically called when an...Ch. 7 - Constructors cannot have a(n) ______ type.Ch. 7 - A(n) ______ constructor is one that requires no...Ch. 7 - A destructor is a member function that is...Ch. 7 - A destructor has the same name as the class but is...Ch. 7 - A constructor whose parameters all have default...Ch. 7 - A class may have more than one constructor, as...Ch. 7 - Prob. 25RQECh. 7 - In general, it is considered good practice to have...Ch. 7 - When a member (unction forms part of the interface...Ch. 7 - When a member function performs a task internal to...Ch. 7 - True or false: A class object can be passed to a...Ch. 7 - Prob. 30RQECh. 7 - It is considered good programming practice to...Ch. 7 - If you were writing a class declaration for a...Ch. 7 - If you were writing the definitions for the Canine...Ch. 7 - A structure is like a class but normally only...Ch. 7 - By default, are the members of a structure public...Ch. 7 - Prob. 36RQECh. 7 - When a structure variable is created its members...Ch. 7 - Prob. 38RQECh. 7 - Prob. 39RQECh. 7 - Prob. 40RQECh. 7 - Prob. 41RQECh. 7 - Write a function called showReading. It should...Ch. 7 - Write a function called input Reading that has a...Ch. 7 - Write a function called getReading, which returns...Ch. 7 - Prob. 45RQECh. 7 - Prob. 46RQECh. 7 - Assume a class named Inventory keeps track of...Ch. 7 - Write a remove member function that accepts an...Ch. 7 - Prob. 49RQECh. 7 - A) struct TwoVals { int a, b; } ; int main() { }...Ch. 7 - A) struct Names { string first; string last; } ;...Ch. 7 - A) class Circle: { private double centerX; double...Ch. 7 - A) class DumbBell; { int weight; public: void set...Ch. 7 - If the items on the following list appeared in a...Ch. 7 - Look at the following description of a problem...Ch. 7 - Soft Skills Working in a team can often help...Ch. 7 - Date Design a class called Date that has integer...Ch. 7 - Report Heading Design a class called Heading that...Ch. 7 - Widget Factory Design a class for a widget...Ch. 7 - Car Class Write a class named Car that has the...Ch. 7 - Population In a population, the birth rate and...Ch. 7 - Gratuity Calculator Design a Tips class that...Ch. 7 - Inventory Class Design an Inventory class that can...Ch. 7 - Movie Data Write a program that uses a structure...Ch. 7 - Movie Profit Modify the Movie Data program written...Ch. 7 - Prob. 10PCCh. 7 - Prob. 11PCCh. 7 - Ups and Downs Write a program that displays the...Ch. 7 - Wrapping Ups and Downs Modify the program you...Ch. 7 - Left and Right Modify the program you wrote for...Ch. 7 - Moving Inchworm Write a program that displays an...Ch. 7 - Group Project 19. 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