Population data Program plan: • Declare a function named “main()”. Inside the function, ○ Use the “try…except” block to read the population from the file. ○ Create a file object “fileObj” for the file “USPopulation.txt” ○ Now, read the populations from the file and store it in “populationList” and close the file. ○ Use a “for” loop to convert the populations into “float” type. ○ Create an empty list “populationChange” to hold the changes in the population. ○ Now, use the “for” loop to find the population change for the successive years and store it in “populationChange”. ○ Call the function “max()” to find the greatest population change. ○ Call the function “index()” to find the position of the greatest population change. ○ Call the function “min()” to find the lowest population change. ○ Call the function “index()” to find the position of the lowest population change. ○ Then, call the function “sum()” to find the sum of the population changes in the “populationChange”. ○ Find the average annual change. ○ Now, print the average annual change, greatest population change year, and lowest population change year using the “print()” function. ○ Handle the exceptions if any occurred using the “except” blocks. • In the last, call the function “main()” to execute the program.

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3. Problem Description: Define the Circle2D class that contains: Two double data fields named x and y that specify the center of the circle with get methods. • A data field radius with a get method. • A no-arg constructor that creates a default circle with (0, 0) for (x, y) and 1 for radius. • A constructor that creates a circle with the specified x, y, and radius. • A method getArea() that returns the area of the circle. • A method getPerimeter() that returns the perimeter of the circle. • • • A method contains(double x, double y) that returns true if the specified point (x, y) is inside this circle. See Figure (a). A method contains(Circle2D circle) that returns true if the specified circle is inside this circle. See Figure (b). A method overlaps (Circle2D circle) that returns true if the specified circle overlaps with this circle. See the figure below. р O со (a) (b) (c)< Figure (a) A point is inside the circle. (b) A circle is inside another circle. (c) A circle overlaps another…

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Chapter 7, Problem 9PE

Program Plan Intro

Population data

Program plan:

• Declare a function named “main()”. Inside the function,

○ Use the “try…except” block to read the population from the file.

○ Create a file object “fileObj” for the file “USPopulation.txt”

○ Now, read the populations from the file and store it in “populationList” and close the file.

○ Use a “for” loop to convert the populations into “float” type.

○ Create an empty list “populationChange” to hold the changes in the population.

○ Now, use the “for” loop to find the population change for the successive years and store it in “populationChange”.

○ Call the function “max()” to find the greatest population change.

○ Call the function “index()” to find the position of the greatest population change.

○ Call the function “min()” to find the lowest population change.

○ Call the function “index()” to find the position of the lowest population change.

○ Then, call the function “sum()” to find the sum of the population changes in the “populationChange”.

○ Find the average annual change.

○ Now, print the average annual change, greatest population change year, and lowest population change year using the “print()” function.

○ Handle the exceptions if any occurred using the “except” blocks.

• In the last, call the function “main()” to execute the program.

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