COP 3014 Triangle Calculator

Assignment purpose: simple i/o in C++, simple math in C++, simple loop, data types string, double, and int, formatting output in C++, predefined functions, programmer defined functions, call by reference and call by value.

Write a program that will calculate the area and perimeter of a triangle and the area and perimeter of a rectangle

• The user should be able to continue to the calculate either the area and perimeter of a triangle OR the area and perimeter of a rectangle until they enter a Q or q to QUIT
• You must use the main function provided
• YOU MAY NOT MAKE ANY MODIFICATIONS TO THE MAIN FUNCTION
• You will implement the following void functions:
  • MenuChoices
  • ProcessChoice
• You may add other programmer defined functions as needed
• You must use function prototypes (above the main function) and function definitions (below the main function)
• BE SURE TO ADD COMMENTS TO THE FUNCTION PROTOTYPES
  • pre and post conditions and a brief description
• BE SURE TO ADD COMMENTS TO THE FUNCTION DEFINITIONS
  • brief description

Here is the main function:

int main()
{
double area = 0.0;
double perimeter;
string quit;
string name;
cout << "Welcome to the area and perimeter calculator, what is your first name? ";
cin >> name;
cout.setf(ios::fixed);
cout.setf(ios::showpoint);
cout.precision(3); //display the area to 3 decimal places
MenuChoices(name, quit);
ProcessChoice(quit, area, perimeter);
while (quit != "Q" && quit != "q")
{
cout << "\nThe area (displayed in the main function) is " << area << endl;
cout << "\nThe perimeter (displayed in the main function) is " << perimeter << endl;
MenuChoices(name, quit);
ProcessChoice(quit, area, perimeter);
}
cout << "\nGoodbye " << name << ", Have a great day! ";
return 0;
}

Additional instructions:

Write the algorithm before implementing the program
Be sure to test throughout the code development

Follow all style rules and include all necessary documentation

• consistent indentation
• proper, meaningful function and variable names
• display the sides to one decimal place and the area and perimeter to 3 decimal places, see the sample output
• pre/post conditions and brief description on the function prototypes
• brief description comments on the function definitions, see the program 3 sample
• See the example provided for program 3 for proper commenting and style.
• Be sure to eliminate all warnings

The area of an arbitrary triangle can be computed using the following formula:

area =sqrt(s(s - a)(s - b)(s - c))

Where a, b, and c are the lengths of the sides and s is the semiperimeter.

s = (a + b + c) / 2

Note that not all combinations of a, b, and c produce a triangle.

• The sum of any two sides of a triangle must be greater than the third side.
• You must make sure that the lengths of the sides of the triangle entered by the user are valid
  • if not valid lengths, let the user know by printing a message stating that the lengths are invalid
  • produce correct results for legal data and reasonable results for illegal combinations.

NOTE: The perimeter is NOT the same as the semiperimeter

• Use a descriptive name for any additional functions and identifiers
• Get the users first name and interact with the user by displaying their name (see the sample output)
• Print the results (area and perimeter) in the main function
• The user should be able to continue to enter triangle sides until they enter a Q or q to QUIT or Y or y to continue
• There is a sqrt function in #include < cmath> (square root)

Here is sample output

Welcome to the area and perimeter calculator, what is your first name? Tami
----------------------------------------------
Tami, please enter a T, R, or Q.
To calculate:
The area and perimeter of a triangle, enter T
The area and perimeter of a rectangle, enter R
----------------------------------------------
Enter Q to quit: w
That input is not recognized
The area (displayed in the main function) is 0.000
The perimeter (displayed in the main function) is 0.000
----------------------------------------------
Tami, please enter a T, R, or Q.
To calculate:
The area and perimeter of a triangle, enter T
The area and perimeter of a rectangle, enter R
----------------------------------------------
Enter Q to quit: t
*********************************************
Enter the length of side one: 9.21
Enter the length of side two: 3.3
Enter the length of side three: 2.76
Not a valid triangle
The area (displayed in the main function) is 0.000
The perimeter (displayed in the main function) is 0.000
----------------------------------------------
Tami, please enter a T, R, or Q.
To calculate:
The area and perimeter of a triangle, enter T
The area and perimeter of a rectangle, enter R
----------------------------------------------
Enter Q to quit: t
*********************************************
Enter the length of side one: 3.78
Enter the length of side two: 2.43
Enter the length of side three: 4.12
------------------------------------
Side A Side B Side C
3.8 2.4 4.1
The area (displayed in the main function) is 4.522
The perimeter (displayed in the main function) is 10.330
----------------------------------------------
Tami, please enter a T, R, or Q.
To calculate:
The area and perimeter of a triangle, enter T
The area and perimeter of a rectangle, enter R
----------------------------------------------
Enter Q to quit: r
Enter the length of side one: 1.345
Enter the length of side two: 82.911
------------------------------------
Side X Side Y
1.3 82.9
The area (displayed in the main function) is 111.515
The perimeter (displayed in the main function) is 168.512
----------------------------------------------
Tami, please enter a T, R, or Q.
To calculate:
The area and perimeter of a triangle, enter T
The area and perimeter of a rectangle, enter R
----------------------------------------------
Enter Q to quit: q
Goodbye Tami, Have a great day!