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  1. //Jacob Silvestre	CSC5 	Chapter 4, P. 225, #21
  2. //
  3. /************************************************************************************
  4. *
  5. * GEOMETRY CALCULATOR
  6. *____________________________________________________________________________________
  7. * This program displays a geometry calculator menu and allows the user to calculate 
  8. * the area of a circle, rectangle, or triangle. 
  9. *
  10. * Circle Area Formula: 
  11. * Area = 3.14159 x Radius x Radius 
  12. * 
  13. * Rectangle Area Formula: 
  14. * Area = Length x Width 
  15. * 
  16. * Triangle Area Formula: 
  17. * Area = Base x Height x 0.5
  18. * ____________________________________________________________________________________
  19. * INPUT 
  20. * choice : Menu choice chosen by user 
  21. * radius : Radius of circle
  22. * length : Length of rectangle 
  23. * width  : Width of rectangle 
  24. * base	 : Base of triangle
  25. * height : height of triangle 
  26. * 
  27. * OUTPUT 
  28. * area	 : Calculated area of selected shape 
  29. * 
  30. **************************************************************************************/
  31.  
  32. #include <iostream>
  33. using namespace std;
  34.  
  35. int main() {
  36.  
  37. const double PI = 3.14159;	// Constant value of pi 
  38.  
  39. int choice;	// INPUT - Menu selection 
  40. double radius; // INPUT - Radius of circle
  41. double length; // INPUT - Length of rectangle 
  42. double width;  // INPUT - Width of rectangle 
  43. double base;   // INPUT - Base of triangle
  44. double height; // INPUT - Height of triangle 
  45. double area;   // OUTPUT - Area of chosen shape 
  46.  
  47. // 
  48. // Display Geometry calculator Menu 
  49. //
  50.  
  51. 	cout << "Geometry Calculator" << endl; 
  52. 	cout << "1. Calculate the Area of a Circle" << endl; 
  53. 	cout << "2. Calculate the Area of a Rectangle" << endl; 
  54. 	cout << "3. Calculate the Area of a Triangle" << endl; 
  55. 	cout << "4. Quit" << endl; 
  56. 	cout << "Enter your choice (1-4): "; 
  57. 	cin >> choice; 
  58.  
  59. //
  60. // Process User Selection 
  61. // 
  62.    switch(choice)
  63.    {
  64. 		case 1: 
  65.  
  66. // 
  67. //          Input Circle Radius 
  68. //
  69. 			cout << "Enter the radius of the circle: "; 
  70. 			cin >> radius; 
  71.  
  72. //
  73. //	Validate Radius 
  74. //
  75. 	    	if (radius < 0)
  76. 	    	{
  77. 	    		cout  << "ERROR: Radius cannot be negative." << endl;
  78.             }
  79.             else
  80.             {
  81.  
  82. //
  83. //              Compute Circle Area
  84. //
  85.                 area = PI * radius * radius;
  86.  
  87. //
  88. //              Output Result
  89. //
  90.                 cout << "The area of the circle is "
  91.                      << area << endl;
  92.             }
  93.  
  94.             break;
  95.  
  96.         case 2:
  97.  
  98. //
  99. //          Input Rectangle Dimensions
  100. //
  101.             cout << "Enter the length of the rectangle: ";
  102.             cin >> length;
  103.  
  104.             cout << "Enter the width of the rectangle: ";
  105.             cin >> width;
  106.  
  107. //
  108. //          Validate Rectangle Dimensions
  109. //
  110.             if (length < 0 || width < 0)
  111.             {
  112.                 cout << "ERROR: Length and width cannot be negative."
  113.                      << endl;
  114.             }
  115.             else
  116.             {
  117.  
  118. //
  119. //              Compute Rectangle Area
  120. //
  121.                 area = length * width;
  122.  
  123. //
  124. //              Output Result
  125. //
  126.                 cout << "The area of the rectangle is "
  127.                      << area << endl;
  128.             }
  129.  
  130.             break;
  131.  
  132.         case 3:
  133.  
  134. //
  135. //          Input Triangle Dimensions
  136. //
  137.             cout << "Enter the base of the triangle: ";
  138.             cin >> base;
  139.  
  140.             cout << "Enter the height of the triangle: ";
  141.             cin >> height;
  142.  
  143. //
  144. //          Validate Triangle Dimensions
  145. //
  146.             if (base < 0 || height < 0)
  147.             {
  148.                 cout << "ERROR: Base and height cannot be negative."
  149.                      << endl;
  150.             }
  151.             else
  152.             {
  153.  
  154. //
  155. //              Compute Triangle Area
  156. //
  157.                 area = base * height * 0.5;
  158.  
  159. //
  160. //              Output Result
  161. //
  162.                 cout << "The area of the triangle is "
  163.                      << area << endl;
  164.             }
  165.  
  166.             break;
  167.  
  168.         case 4:
  169.  
  170. //
  171. //          End Program
  172. //
  173.             cout << "Program ending." << endl;
  174.             break;
  175.  
  176.         default:
  177.  
  178. //
  179. //          Output Error Message
  180. //
  181.             cout << "ERROR: Enter a number from 1 through 4." << endl;
  182.  
  183. 	    }
  184.  
  185. 		return 0;
  186. }
Success #stdin #stdout 0s 5316KB
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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 radius of the circle: The area of the circle is 78.5397
https://ideone.com/O1Hgme
Chapter 4 Problem 21
language:
C++ (gcc 8.3)
created:
3 days ago
visibility:
public

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