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  1. //Henry Hill CSC5 Chapter 4, P. 226, #25
  2. //
  3. /**************************************************************
  4.  * CALCULATE AREA OF CIRCLE, TRIANGLE, OR RECTANGLE
  5.  * ____________________________________________________________
  6.  * This program will ask the user to choose either a circle
  7.  * rectangle, or triangle, and will then ask for the components
  8.  * necessary to calculate and display the area of either 
  9.  * requested shape.
  10.  * ____________________________________________________________
  11.  * INPUT
  12.  *  radius		    : Radius of a cirlce
  13.  *  length		    : Length of a rectangle
  14.  *  width   		: Width of a rectangle
  15.  *  base    		: Base of a triangle
  16.  *  height  		: Height of a triangle
  17.  *  shapeChoice 	: User's menu choice
  18.  * 
  19.  * OUTPUT
  20.  * areaCircle   	: Area of the circle
  21.  * areaRectangle    : Area of the rectangle
  22.  * areaTriangle 	: Area of the triangle
  23.  ****************************************************************/
  24.  
  25. #include <iostream>
  26. #include <iomanip>
  27. #include <cmath>
  28. using namespace std;
  29.  
  30. int main() 
  31. {
  32. 	const float PI = 3.14159;
  33. 	const int shapeChoice1 = 1;
  34. 	const int shapeChoice2 = 2;
  35. 	const int shapeChoice3 = 3;
  36. 	const int shapeChoice4 = 4;
  37. 	float radius;				  // 
  38. 	float length;   		  	  //
  39. 	float width;    			  //
  40. 	float base;     			  //
  41. 	float height;   			  //
  42. 	int shapeChoice;    		  //
  43. 	float areaCircle;   		  //
  44. 	float areaRectangle;          //
  45. 	float areaTriangle;           //
  46.  
  47.  // Menu bit
  48. 	cout << "Geometry Calculator\n";
  49. 	cout << "1. Calculate the Area of a Circle\n";
  50. 	cout << "2. Calculate the Area of a Rectangle\n";
  51. 	cout << "3. Calculate the Area of a Triangle\n";
  52. 	cout << "4. Quit\n";
  53.  
  54. 	cin >> shapeChoice;
  55.  
  56. 	cout << fixed;
  57. 	cout << showpoint; 
  58. 	cout << setprecision(2);
  59.  
  60. 	if (shapeChoice == shapeChoice1)
  61. 	{
  62. 		cout <<  "\nWhat is the radius? ";
  63. 		cin >> radius;
  64. 		areaCircle = PI * pow(radius, 2);
  65. 		cout << "\nThe area of the circle is " << areaCircle;
  66. 	}
  67. 	else if (shapeChoice == shapeChoice2)
  68. 	{
  69. 		cout  << "\nWhat is the length and width of the rectangle?";
  70. 		cin >> length;
  71. 		cin >> width;
  72. 		areaRectangle = length * width;
  73. 		cout  << "\nThe area of the Rectangle is " << areaRectangle;
  74. 	}
  75. 	else if (shapeChoice == shapeChoice3)
  76. 	{
  77. 		cout  << "\nWhat is the length and width of the triangle?";
  78. 		cin >> base;
  79. 		cin >> height;
  80. 		areaTriangle = base * height * 0.5;
  81. 		cout << "\nThe area of the triangle is " << areaTriangle;
  82. 	}
  83. 	else if (shapeChoice == shapeChoice4)
  84. 	{
  85. 		cout << "\nDone";
  86. 	}
  87. 	else
  88. 		cout  << "Invalid ";
  89.  
  90. 	return 0;
  91. }
  92.  
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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

What is the radius? 
The area of the circle is 314.16
https://ideone.com/ZM0n2b
language:
C++ (gcc 8.3)
created:
1 year ago
visibility:
secret

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