circle.cpp

FZU 大二 的数据结构与算法 老师出的题目的优秀作业 第2到第5章

#include<iostream.h>
#include<fstream.h>
#include <iomanip.h>
#include<math.h>
#define PI 3.1415926

class Geometry
{
public:
	Geometry(double);
	double GetRadius(){return r;}
	double Area1(double r); 
	double Girth1(double r);
    Geometry(double,double);
	double GetHeight(){return r1;}
	double GetWidth(){return r2;}
    double Area2(double r1,double r2); 
	double Diagonal(double r1,double r2);
	double Girth2(double r1,double r2);

private:
	double r,r1,r2;
};

double Geometry::Area1(double r)
{
	return (PI*r*r);
}

double Geometry::Girth1(double r)
{
	return (2*PI*r);
}

double Geometry::Area2(double r1,double r2)
{
	return (r1*r2);
}

double Geometry::Girth2(double r1,double r2)
{
	return (2*(r1+r2));
}

double Geometry::Diagonal(double r1,double r2)
{
	return (sqrt(r1*r1+r2*r2));
}

Geometry::Geometry(double r)
{
}

Geometry::Geometry(double r1, double r2)
{
}



int main()
{
    double r,m1,m2=0.0;
    ifstream input("input.txt");
	input >> r;
    m2=m1=2*r;
    Geometry g1(r);
	Geometry g2(m1,m2);
	ofstream output("output.txt");
	output<<setiosflags(ios::fixed)<<setprecision(4)<<g1.Area1(r)<<' '
	      <<setiosflags(ios::fixed)<<setprecision(4)<<g1.Girth1(r)<<endl;
	output<<setiosflags(ios::fixed)<<setprecision(4)<<g2.Area2(m1,m2)<<' '
	      <<setiosflags(ios::fixed)<<setprecision(4)<<g2.Girth2(m1,m2)<<' '
	      <<setiosflags(ios::fixed)<<setprecision(4)<<g2.Diagonal(m1,m2)<<endl;		
    output<<setiosflags(ios::fixed)<<setprecision(4)<<g1.Area1(sqrt(2.0)*r)<<' '
	      <<setiosflags(ios::fixed)<<setprecision(4)<<g1.Girth1(sqrt(2.0)*r)<<endl;
	return 0;
}