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  1. //Charlotte Davies-Kiernan          CS1A                   Chapter 4 P.225 #21
  2. //
  3. /******************************************************************************
  4.  * 
  5.  * Display a Geometry Calculator
  6.  * ____________________________________________________________________________
  7.  * This program will display a men with 4 options: calculate one of three 
  8.  * area calculations, circle, rectangle, and triangle or to quit. 
  9.  * 
  10.  * The formuals that will be used:
  11.  * area of circle = PI * radius * radius
  12.  * area of rectangle = length * width
  13.  * area of triangle = 0.5 * base * height
  14.  * ____________________________________________________________________________
  15.  * INPUT
  16.  *   choice      //choice the user picks which decides what the program will output
  17.  *   radius      //radius of circle the user will enter if they pick 1
  18.  *   length      //length of rectangle the user will enter if they pick 2
  19.  *   width       //width of rectangle the user will enter if they pick 2
  20.  *   base        //base of triangle the user will enter if they pick 3
  21.  *   height      //height of triangle the user will enter if they pick 3
  22.  *   
  23.  * OUTPUT
  24.  *   circleArea     //Area of circle if the user chooses 1
  25.  *   recArea        //Area of rectangle if the user chooses 2
  26.  *   triArea        //Area of triangle if the user chooses 3
  27.  *****************************************************************************/
  28. #include <iostream>
  29. #include <iomanip>
  30. #include <cmath>
  31. using namespace std;
  32. int main() 
  33. {
  34. //Variables
  35. double base;         //INPUT - base that will need to be entered if user chooses 3
  36. double circleArea;   //OUTPUT - area of circle if user chooses 1
  37. double height;       //INPUT - height that will need to be entered if user chooses 3
  38. double length;       //INPUT - length that will need to be entered if user chooses 2
  39. double radius;       //INPUT - radius that will need to be entered if user chooses 1
  40. double recArea;      //OUTPUT - area of rectangle if user chooses 2
  41. double triArea;      //OUTPUT - area of triangle if user chooses 3
  42. double width;        //INPUT - width that will need to be entered if user chooses 2
  43. int choice;          //INPUT - the users choice of what the program will output
  44. //
  45. //Display the menu
  46. cout << "Geometry Calculator" << endl;
  47. cout << "1. Calculate the Area of a Circle" << endl;
  48. cout << "2. Calculate the Area of a Rectangle" << endl;
  49. cout << "3. Calcualte the Area of a Triangle" << endl;
  50. cout << "4. Quit" << endl;
  51. cout << "Enter your choice (1-4): "<< endl << endl;
  52. cin >> choice;
  53. //
  54. //Validate input
  55. if (choice < 1 || choice > 4){
  56.      cout << "Error: Invalid choice. Please enter a number from 1 to 4" << endl;
  57.      return 1;
  58. }
  59. cout << fixed << setprecision(2);
  60. switch (choice) {
  61.      case 1: //Circle
  62.          cout << "Enter the radius of the circle: ";
  63.          cin >> radius;
  64.          if (radius < 0)
  65.               cout << "Error: Radius cannot be negative" << endl;
  66.          else {
  67.          	circleArea = M_PI * radius * radius;
  68.          	cout << "The area of the circle is: " << circleArea << endl;
  69.          }
  70.          	break;
  71.      case 2: //Rectangle
  72.          cout << "Enter the length of the rectangle: " << endl;
  73.          cin >> length;
  74.          cout << "Enter the width of the rectangle: " << endl;
  75.          cin >> width;
  76.          if (length < 0 || width < 0)
  77.               cout << "Error: length and width cannot be negative." << endl;
  78.          else {
  79.          	recArea = length * width;
  80.          	cout << "The area of the rectangle is: " << recArea << endl;
  81.          }
  82.          break;
  83.      case 3: //Triangle
  84.          cout << "Enter the base of the triangle: " << endl;
  85.          cin>> base;
  86.          cout << "Enter the height of the triangle: " << endl;
  87.          cin >> height;
  88.          if (base < 0 || height < 0)
  89.               cout << "Error: Base and height cannot be negative." << endl;
  90.          else {
  91.             triArea = 0.5 * base * height;
  92.             cout << "The area of the triangle is: " << triArea << endl;
  93.          }
  94.          break;
  95.      case 4: //Quit
  96.          cout << "Exiting the program. Goodbye!" << endl;
  97.          break;
  98. }
  99. return 0;
  100. }
Success #stdin #stdout 0.01s 5280KB
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Geometry Calculator
1. Calculate the Area of a Circle
2. Calculate the Area of a Rectangle
3. Calcualte the Area of a Triangle
4. Quit
Enter your choice (1-4): 

Enter the length of the rectangle: 
Enter the width of the rectangle: 
The area of the rectangle is: 170.36
https://ideone.com/mFkRpZ
language:
C++ (gcc 8.3)
created:
9 days ago
visibility:
public

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