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  1. // Marvyn De La Torre    CS1A    Chapter 4, P.225, #21
  2.  
  3. /**************************************************************
  4. * Calculate Geometric Area
  5. *
  6. * This program calculates the area of a circle, rectangle, or
  7. * triangle based on the selected geometric shape.
  8. *
  9. * Input:
  10. * Menu selection = choice
  11. * Radius = radius
  12. * Length = length
  13. * Width = width
  14. * Base = base
  15. * Height = height
  16. *
  17. * Output:
  18. * Area = area
  19. **************************************************************/
  20.  
  21. #include <iostream>
  22. #include <iomanip>
  23. using namespace std;
  24.  
  25. int main()
  26. {
  27.     int choice;
  28.     double area, radius, length, width, base, height;
  29.  
  30.     cout << "Geometry Calculator" << endl;
  31.     cout << "1. Calculate the Area of a Circle" << endl;
  32.     cout << "2. Calculate the Area of a Rectangle" << endl;
  33.     cout << "3. Calculate the Area of a Triangle" << endl;
  34.     cout << "4. Quit" << endl;
  35.     cout << "Enter your choice: ";
  36.     cin >> choice;
  37.  
  38.     cout << fixed << showpoint << setprecision(2);
  39.  
  40.     switch (choice)
  41.     {
  42.         case 1:
  43.             cout << "Enter the radius: ";
  44.             cin >> radius;
  45.  
  46.             if (radius < 0)
  47.                 cout << "Radius cannot be negative." << endl;
  48.             else
  49.             {
  50.                 area = 3.14159 * radius * radius;
  51.                 cout << "Area: " << area << endl;
  52.             }
  53.             break;
  54.  
  55.         case 2:
  56.             cout << "Enter the length: ";
  57.             cin >> length;
  58.  
  59.             cout << "Enter the width: ";
  60.             cin >> width;
  61.  
  62.             if (length < 0 || width < 0)
  63.                 cout << "Length and width cannot be negative." << endl;
  64.             else
  65.             {
  66.                 area = length * width;
  67.                 cout << "Area: " << area << endl;
  68.             }
  69.             break;
  70.  
  71.         case 3:
  72.             cout << "Enter the base: ";
  73.             cin >> base;
  74.  
  75.             cout << "Enter the height: ";
  76.             cin >> height;
  77.  
  78.             if (base < 0 || height < 0)
  79.                 cout << "Base and height cannot be negative." << endl;
  80.             else
  81.             {
  82.                 area = base * height * 0.5;
  83.                 cout << "Area: " << area << endl;
  84.             }
  85.             break;
  86.  
  87.         case 4:
  88.             cout << "Program ended." << endl;
  89.             break;
  90.  
  91.         default:
  92.             cout << "Invalid choice." << endl;
  93.     }
  94.  
  95.     return 0;
  96. }
Success #stdin #stdout 0s 5296KB
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stdout
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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: Enter the length: Enter the width: Area: 200.00
https://ideone.com/nubHff
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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