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/*
求三角形，圆。梯形周长及面积的代码
*/
class Trangle
{
	double sideA,sideB,sideC,area,length;
	boolean boo;
	public Trangle(double a,double b,double c)
	{
		sideA=a;
		sideB=b;
		sideC=c;
		if(a+b>c&&a+c>b&&b+c>a)
		{
			boo=true;
		}
		else
	    {
		    boo=false;
	    }
	}
	double getLength()
	{
		if(boo)
		{
			length=sideA+sideB+sideC;
			return length;
		}
		else
		{
			System.out.println("not a trangle");
			return 0;
		}
	}
	public double getArea()
	{
		if(boo)
		{
			double p=(sideA+sideB+sideC)/2.0;
			area=Math.sqrt(p*(p-sideA)*(p-sideB)*(p-sideC));
			return area;
		}
		else
		{
			System.out.println("not a trangle");
			return 0;
		}
	}
	public void setABC(double a,double b,double c)
	{
		sideA=a;sideB=b;sideC=c;
		if(a+b>c&&a+c>b&&b+c>a)
		{
			boo=true;
		}
		else
		{
			boo=false;
		}
	}
}
class Lader
{
	double above,bottom,height,area;
	Lader(double a,double b,double h)
	{
		above=a;
		bottom=b;
		height=h;
	}
	double getArea()
	{
		area=(above+bottom)/2*height;
		return area;
	}
}
class Circle
{
	double radius,area;
	Circle(double r)
	{
		radius=r;
	}
	double getArea()
	{
		return(3.14*radius*radius);
	}
	double getLength()
	{
		return(3.14*2*radius);
	}
	void setRadius(double newRadius)
	{
		radius=newRadius;
	}
	double getRadius()
	{
		return radius;
	}
}
public class AreaAndLength
{
	public static void main(String args[])
	{
		double length,area;
		Circle circle=null;
		Trangle trangle;
		Lader lader;
		circle=new Circle(10);
		trangle=new Trangle(3,4,5);
		lader=new Lader(3,4,10);
		length=trangle.getLength();
		System.out.println("圆的周长："+length);
		area=trangle.getArea();
		System.out.println("圆的面积"+area);
		length=trangle.getLength();
		System.out.println("三角形的周长："+length);
		area=trangle.getArea();
		System.out.println("三角形的面积："+area);
		area=lader.getArea();
		System.out.println("梯形的面积："+area);
		trangle.setABC(12,34,1);
		area=trangle.getArea();
		System.out.println("三角形的面积："+area);
		length=trangle.getLength();
		System.out.println("三角形的周长："+length);
	}
}