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  1. #include <iostream>
  2. #include <cmath> //sqrt
  3. #include <vector> //std::vector
  4.  
  5. //You can use double instead of float if you want it to be more accurate
  6. //but for these I don't think they really need to be more than a few
  7. //digits
  8. struct Point //this will be a basic point without operators
  9. {
  10.     float x , y;
  11. };
  12.  
  13. struct BoundingBox
  14. {
  15.     float top , left , width , height;
  16. };
  17.  
  18. class Shape
  19. {
  20.     public:
  21.     	virtual ~Shape(){}
  22.         virtual float area( void ) const = 0;
  23.         virtual float perimeter( void ) const = 0; //circumference for circles but oh well
  24.     protected:
  25.     	Point _origin;
  26. 	 	BoundingBox bounds;
  27. };
  28.  
  29. //if you have a square derive from rectangle
  30. //you might want to use virtual publics or consider
  31. //composition instead of inheritance hierarchy 
  32.  
  33. class Square : public Shape
  34. {
  35.     public:
  36.         Square( const float width , const Point origin );
  37.         float area( void ) const;
  38.         float perimeter( void ) const;
  39.     private:
  40.         float width;
  41. };
  42.  
  43. Square::Square( const float width , const Point origin ) : width( width )
  44. {
  45. 	_origin = origin;
  46. 	bounds.left = origin.x - width / 2.0f;
  47. 	bounds.top = origin.y - width / 2.0f;
  48. 	bounds.width = width;
  49. 	bounds.height = width;
  50. }
  51.  
  52. float Square::area( void ) const
  53. {
  54. 	return width * width;
  55. }
  56.  
  57. float Square::perimeter( void ) const
  58. {
  59. 	const int sides = 4;
  60. 	return sides * width; 
  61. }
  62.  
  63.  
  64. class Circle : public Shape
  65. {
  66.     public:
  67.         Circle( const float radius , const Point origin );
  68.         float area( void ) const;
  69.         float perimeter( void ) const; //yeah its circum but in my example its perim
  70.     private:
  71.         float radius;
  72. };
  73.  
  74. Circle::Circle( const float radius , const Point origin ) : radius( radius )
  75. {
  76. 	_origin = origin;
  77. 	bounds.left = origin.x - radius;
  78. 	bounds.top = origin.y + radius;
  79. 	bounds.width = radius * 2; //radius * 2 = diameter
  80. 	bounds.height = bounds.width; //height and width are same in a circle
  81. }
  82.  
  83. float Circle::area( void ) const
  84. {
  85. 	const float pi = 3.14159f;
  86. 	return pi * radius * radius;
  87. }
  88.  
  89. float Circle::perimeter( void ) const
  90. {
  91. 	const float pi = 3.14159;
  92. 	return 2 * pi * radius;
  93. }
  94.  
  95. //mine is a Equilateral Triangle
  96. class Triangle : public Shape
  97. {
  98. 	public:
  99. 		Triangle( const float length , const Point origin );
  100. 		float area( void ) const;
  101. 		float perimeter( void ) const;
  102. 	private:
  103. 		float length;	
  104. };
  105.  
  106. Triangle::Triangle( const float length , const Point origin ) : length( length )
  107. {
  108. 	_origin = origin;
  109. 	bounds.left = origin.x - length / 2.0f;
  110. 	bounds.top = origin.y - length / 2.0f;
  111. 	bounds.width = length;
  112. 	bounds.height = sqrt( length * length - length / 2.0f * length / 2.0f );
  113. }
  114.  
  115. float Triangle::area( void ) const
  116. {
  117. 	return length * bounds.height / 2.0f;
  118. }
  119.  
  120. float Triangle::perimeter( void ) const
  121. {
  122. 	const int sides = 3;
  123. 	return sides * length;
  124. }
  125.  
  126. int main()
  127. {
  128. 	Point origin{ 10 , 5 }; //center of shape is at 10 , 5
  129.  
  130. 	std::vector<Shape *> shapes; //smart pointer would be better
  131.  
  132. 	shapes.push_back( new Triangle(10,origin) );
  133. 	shapes.push_back( new Circle(5,origin) );
  134. 	shapes.push_back( new Square(10,origin) );
  135.  
  136. 	for( const auto &it : shapes )
  137. 	{
  138. 		//triangle , circle , square
  139. 		std::cout << "Area: " << it->area() << " Perimeter: " << it->perimeter() << std::endl;
  140. 		delete it;
  141. 	}
  142.  
  143. 	return 0;
  144. }
  145.  
Success #stdin #stdout 0s 3432KB
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Area: 43.3013 Perimeter: 30
Area: 78.5397 Perimeter: 31.4159
Area: 100 Perimeter: 40
https://ideone.com/rQ7Uj7
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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