Write a program that displays the following menu. The symbols show where newline characters (

" "

) should be displayed:

Geometry Calculator

1. Calculate the Area of a Circle

2. Calculate the Area of a Rectangle

3. Calculate the Area of a Triangle

4. Quit

Enter your choice (1-4):

If the user enters 1:

The program should print the following string as a prompt:

" Enter the circle's radius: "

The program should then read the radius of the circle as input and then calculate the circle's area using the following formula:

Area = r2 = r2

In your calculation, use

3.14159

for and the radius of the circle for

r

.

The program should then print the string

" The area is "

, followed by the area, followed by a newline.

If the user enters 2:

The program should print the following string as a prompt:

" Enter the rectangle's length: "

The program should read the length as input and then print the following string as a prompt:

"Enter the rectangle's width: "

The program should read the width as input and then calculate the rectangle's area using the following formula:

Area = length width =

The program should then print the string

" The area is "

, followed by the area, followed by a newline.

If the user enters 3:

The program should print the following string as a prompt:

"Enter the length of the base: "

The program should read the base as input and then print the following string as a prompt:

"Enter the triangle's height: "

The program should read the height as input and then calculate the triangle's area using the following formula:

Area = base height 0.5 = 0.5

The program should then print the string

" The area is "

, followed by the area, followed by a newline.

If the user enters 4:

The program should print the string

"Program ending. "

, and then end.

Input Validation:

The only valid menu choices the user can make are 1, 2, 3, or 4. If the user makes a menu choice other than one of these numbers, the program should print the following strings and then end:

"The valid choices are 1 through 4. Run the "

"program again and select one of those. "

If the user enters a negative number for the circle's radius, print the following string, and then end:

" The radius can not be less than zero. "

If the user enters a negative number for the rectangle's length OR width, print the following string, and then end:

" Only enter positive values for length and width. "

If the user enters a negative number for the triangle's base OR height, print the following string, and then end:

" Only enter positive values for base and height. "

Sample Run

Geometry Calculator

1. Calculate the area of a Circle

2. Calculate the area of a Rectangle

3. Calculate the area of a Triangle

4. Quit

Enter your choice (1-4):

1

Enter the circle's radius:

1

The area is 3.14159

Sample Run

Geometry Calculator

1. Calculate the area of a Circle

2. Calculate the area of a Rectangle

3. Calculate the area of a Triangle

4. Quit

Enter your choice (1-4):

2

Enter the rectangle's length:

10

Enter the rectangle's width:

20

The area is 200