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  1. // Cenyao Huang                             CS1A                         Homework 4, p. 225, #21
  2.  
  3. /******************************************************************************************************
  4. * CALCULATE GEOMETRY
  5. * 
  6. * This program calculates the area of a circle, rectangle, and triangle. 
  7. *
  8. * This program uses the following formulas :
  9. * Area of a circle : 2 * 3.14159 * radius
  10. * Area of a rectangle : length * width
  11. * Area of a triangle : 1/2 * base * height
  12. *
  13. * Input
  14. * radius : the value of the radius of the circle
  15. * length : the value of the length of the rectangle
  16. * width : the value of the width of the rectangle
  17. * base : the value of the base of the triangle
  18. * height : the vallue of the height of the triangle
  19. * area: the value of the area of either the circle, rectangle, or triangle
  20. *******************************************************************************************************/
  21.  
  22. #include <iostream>
  23. using namespace std;
  24.  
  25. int main() {
  26.     // assign variables
  27.     double area;
  28.     int num = 0;
  29.  
  30.     //display menu
  31. 	cout << "Geometry Calculator" << endl << "\t 1. Calculate the Area of a Circle" << endl << "\t 2. Calculate the Area of a Rectangle" << endl << "\t 3. Calculate the Area of a Triangle" << endl << "\t 4. Quit" << endl;
  32.  
  33.     // if the value entered in the menu is not 4, it will loop
  34. 	while (num != 4) 
  35. 	{
  36.     	cin >> num;
  37.         if (num > 4 || num < 1)
  38.            cout << "Number outside of range.";   
  39.  
  40.    // get values to calculate area, then display it
  41.    switch (num) {
  42. 		case 1: 
  43.             double radius; 
  44.             cout << "Please enter the radius of the circle" << endl;
  45. 		    cin >> radius;
  46.             area = 2 * 3.14159 * radius;
  47.             cout << "The area of the circle is: " << area << endl;
  48.             if (radius < 0)
  49.             cout << "Invalid input. Please enter positive numbers.";
  50. 			break;
  51.  
  52. 		case 2: 
  53.             double length, width;
  54.             cout << "Please enter the length and width of the rectangle" << endl;
  55.             cin >> length >> width; 
  56.             area = length * width;
  57.             cout << "The area of the rectangle is" << area << endl; 
  58.             if (length < 0 || width < 0)
  59.                cout << "Invalid input. Please enter positive numbers.";     
  60. 			break;
  61.  
  62. 		case 3:
  63.             double base, height;
  64.             cout << "Please enter the base and height for the triangle" << endl;
  65.             cin >> base >> height;
  66.             area = base * height;
  67.             cout << "The area of the base is: " << area << endl; 
  68.             if (base < 0 || height < 0)
  69.                cout << "Invalid input. Please enter positive numbers.";
  70. 			break;
  71.  
  72. 		case 4:
  73.             cout << "End of program";
  74. 			break;
  75. 	}
  76.  
  77. 	}
  78. 	return 0;
  79. }
Success #stdin #stdout 0.01s 5304KB
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stdin
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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
Please enter the radius of the circle
The area of the circle is: 25.1327
Please enter the length and width of the rectangle: 
The area of the rectangle is: 10
End of program
https://ideone.com/lExMKv
geometry calculator- ch4
language:
C++ (gcc 8.3)
created:
2 days ago
visibility:
public

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