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  1. //Amari Mosley CSC5 Chapter 4, P.224 #21
  2. //
  3. /**************************************************************
  4. * 
  5. * Geometry Calculator
  6. * ____________________________________________________________
  7. * This program displays calculates the area of a circle, 
  8. * rectangle, or triangle, or quit.
  9. * 
  10. * Computation is based on standard geometric formulas:
  11. *     Circle Area    = 3.14159 * r^2
  12. *     Rectangle Area = length * width
  13. *     Triangle Area  = base * height * 0.5
  14. * ____________________________________________________________
  15. * INPUT 
  16. *   choice   : Menu selection (1-4)
  17. *   radius   : Radius of the circle
  18. *   length   : Length of the rectangle
  19. *   width    : Width of the rectangle
  20. *   base     : Base of the triangle
  21. *   height   : Height of the triangle
  22. * 
  23. * OUTPUT 
  24. *   area     : Calculated geometric area
  25. * 
  26. **************************************************************/
  27.  
  28. #include <iostream>
  29. #include <iomanip>
  30. using namespace std;
  31.  
  32. // Defining Main Function
  33. int main ( )
  34. {
  35.     // Defining Constants and Variables
  36.     const double PI = 3.14159;
  37.     int choice;
  38.     double radius; 
  39. 	double length; 
  40. 	double width;
  41.  	double base;
  42.     double height;
  43. 	double area;
  44.  
  45.     // Displaying Menu
  46.     cout << "Geometry Calculator\n";
  47.     cout << "1. Calculate the Area of a Circle\n";
  48.     cout << "2. Calculate the Area of a Rectangle\n";
  49.     cout << "3. Calculate the Area of a Triangle\n";
  50.     cout << "4. Quit\n";
  51.     cout << "Enter your choice (1-4): ";
  52.     cin >> choice;
  53.  
  54.     // Processing User Choice
  55.     switch (choice)
  56.     {
  57.         case 1:
  58.             // Area of Circle
  59.             cout << "Enter the radius of the circle: ";
  60.             cin >> radius;
  61.             if (radius < 0)
  62.             {
  63.                 cout << "Error: Radius cannot be negative." << endl;
  64.             }
  65.             else
  66.             {
  67.                 area = PI * radius * radius;
  68.                 cout << "The area of the circle is " << area << endl;
  69.             }
  70.             break;
  71.  
  72.         case 2:
  73.             // Area of Rectangle
  74.             cout << "Enter the length of the rectangle: ";
  75.             cin >> length;
  76.             cout << "Enter the width of the rectangle: ";
  77.             cin >> width;
  78.             if (length < 0 || width < 0)
  79.             {
  80.                 cout << "Error: Length and width cannot be negative." << endl;
  81.             }
  82.             else
  83.             {
  84.                 area = length * width;
  85.                 cout << "The area of the rectangle is " << area << endl;
  86.             }
  87.             break;
  88.  
  89.         case 3:
  90.             // Area of Triangle
  91.             cout << "Enter the length of the triangle's base: ";
  92.             cin >> base;
  93.             cout << "Enter the height of the triangle: ";
  94.             cin >> height;
  95.             if (base < 0 || height < 0)
  96.             {
  97.                 cout << "Error: Base and height cannot be negative." << endl;
  98.             }
  99.             else
  100.             {
  101.                 area = base * height * 0.5;
  102.                 cout << "The area of the triangle is " << area << endl;
  103.             }
  104.             break;
  105.  
  106.         case 4:
  107.             // Quit
  108.             cout << "Program ending." << endl;
  109.             break;
  110.  
  111.         default:
  112.             // Input Validation for Menu Choice
  113.             cout << "Error: Valid choices are 1 through 4." << endl;
  114.     }
  115.  
  116.     return 0;
  117. }
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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): Enter the length of the triangle's base: Enter the height of the triangle: The area of the triangle is 17.5
https://ideone.com/rbr8Wg
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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