一些C++的课件和实验源代码

				
				#ifndef HEADFILE_FIGURE
				#define HEADFILE_FIGURE
				
				class figure		// 图形类
				{
				public:
					virtual int GetPerimeter()	{return 0;}		// 计算周长
					virtual int	GetArea()		{return 0;}		// 计算面积
				};
				
				class circle: public figure	// 圆类
				{
				protected:
					int m_nRadius;		// 圆半径
				public:
					circle(int radius)	{m_nRadius = radius;}
					int GetPerimeter(){					// 计算周长
						return (int)(2 * 3.1416 * m_nRadius);
					}
					int	GetArea(){						// 计算面积
						return (int)(3.1416 * m_nRadius * m_nRadius);
					}
				};
				
				class square: public figure	// 矩形类
				{
				protected:
					int m_nLength;		// 边长
				public:
					square(int length)	{m_nLength = length;}
					int GetPerimeter(){					// 计算周长
						return 4 * m_nLength;
					}
					int GetArea(){						// 计算面积
						return m_nLength * m_nLength;
					}
				};
				
				#endif