JavaScript

Square and Circle

The material that you are only allowed to use on this subject are:

$1.$ Data types

$2.$ Variables, expressions, and assignment statements

$3.$ Functions

$4.$ If statements

$5.$ The alert, prompt, and confirm window functions.

The program requirements are:

Type in JavaScript statements between the tags in the body that will do the following list of functions with the descriptions that are below the list:

main, calcAreaOfSquare, calcAreaOfCircle, displayResultsOfSquare, displayResultsOfCircle

The description of the main function:

Prompt the user to make a selection of $1$ if they want to find the area of a square or $2$ if they want to find the area of a circle.

Convert the string entered to an integer.

If they entered $1,$ do the following:

Ask them to enter a positive number $(>0)$ that represents the length of a side of the square.

Convert the string entered to a floating$-$point number.

If they entered a positive number, do the following:

Call a method named calcAreaOfSquare that will calculate and return the area of a square. This method takes the side as a parameter.

Call a method named displayResultsOfSquare that will display the results. This method takes the side and the area as parameters.

else, do the following:

Write a message to the browser wrapped in HTML paragraph tags

that state that the number entered by the user is not positive. else if they entered $2,$ do the following:

Ask them to enter a positive number $(>0)$ that represents the radius of the circle.

Convert the string entered to a floating$-$point number.

If they entered a positive number, do the following:

Call a method named calcAreaOfCircle that will calculate and return the area of a circle. This method takes the radius as a parameter. Call a method named displayResultsOfCircle that will display the results. This method takes the radius and the area as parameters.

else, do the following:

Write a message to the browser wrapped in HTML paragraph tags that state that the number entered by the user is not positive.

else do the following:

Write a message to the browser wrapped in HTML paragraph tags that state that the choice was invalid.

The description of the calcAreaOfSquare function:

This function takes one parameter that represents the side of a square and returns a value representing the area of the square. The area of a square is determined by the following formula:

area $=$ side $*$ side

The function returns the area calculated.

The description of the calcAreaOfCircle function:

This function takes one parameter that represents the radius of a circle and returns a value representing the area of the circle. The area of a circle is determined by the following formula:

area $=$ radius $*$ radius $*3\mathrm{.}14259$ The function returns the area calculated.

The description of the displayResultsOfSquare function:

This function takes the side and area of the square as parameters and writes the results to the browser in the following format:

Length of side: whatever the length is

Area of square: whatever the area is Display the numbers with only one decimal place.

The description of the displayResultsOfCircle function:

This function takes the radius and area of the circle as parameters and writes the results to the browser in the following format:

Radius of circle: whatever the radius is

Area of circle: whatever the area is Display the numbers with only one decimal place.