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#include <iostream>#include <cmath>
using namespace std
const double dPI=3.1415926
typedef enum
{
Exit=0,
Round=1,
Rect=2,
Tri=3,
Trap=4,
}shape
class CGraphicArea
{
public:
CGraphicArea()
~CGraphicArea()
double Area(double)
double Area(double width,double length)
double Area(double a,double b,double c)
double Area(double up,double down,double left,double right)
void Input( )
int Handle( )
int Output( )
private:
double *a
double area
int type
}
CGraphicArea::CGraphicArea(){
a = new double[5]
area = 0.0
type = -1
}
CGraphicArea::~CGraphicArea(){
delete a
}
double CGraphicArea::Area(double r)
{
area = dPI*r*r
}
double CGraphicArea::Area(double width,double length)
{
area = width*length
}
double CGraphicArea::Area(double a,double b,double c)
{
double p=(a+b+c)/2
area = sqrt(p*(p-a)*(p-b)*(p-c))
}
double CGraphicArea::Area(double up,double down,double left,double right)
{
double td=down-up
double area1=Area(td,left,right)
double h=area1*2/td
cout<<"------ h = "<<h<<endl
area = (up+down)*h/2
}
void CGraphicArea::Input()
{
cout<<endl<<"请依次输入要计算的图形:"<<endl
cout<<"圆代号1 矩形代号2 三角形代号3 梯形代号4"<<endl
cout<<"无效边长设定为-1,终止输入请输0"<<endl
cout<<"输入格式为："<<endl
cout<<"图形:"<<endl<<"边1 边2 边3 边4"<<endl
cin>>type
cout<<"-------"<<type<<endl
if(type<0||type>4)
{
return
}
switch(type){
case Round:
cin>>a[0]
break
case Rect:
cin>>a[0]>>a[1]
break
case Tri:
cin>>a[0]>>a[1]>>a[2]
break
case Trap:
cin>>a[0]>>a[1]>>a[2]>>a[3]
break
}
}
//return count
int CGraphicArea::Handle()
{
switch(type)
{
case Round:
{
if(a[0]<0)
{
area=-1
break
}
area=Area(a[0])
break
}
case Rect:
{
if(a[0]<=0||a[1]<=0)
{
area=-1
break
}
area=Area(a[0],a[1])
break
}
case Tri:
{
if(a[0]<=0||a[1]<=0||a[2]<=0)
{
area=-1
break
}
if(a[0]+a[1]<a[2] || a[0]+a[2]<a[1] || a[1]+a[2]<a[0])
{
area=-1
break
}
area=Area(a[0],a[1],a[2])
break
}
case Trap:
{
if(a[0]<=0 || a[1]<=0 || a[2]<=0 || a[3]<=0)
{
area=-1
break
}
if( a[1]-a[0]+a[2]<a[3]
|| a[1]-a[0]+a[3]<a[2]
|| a[2]+a[3]<a[1]-a[0])
{
area=-1
break
}
area=Area(a[0],a[1],a[2],a[3])
break
}
case Exit:
return 0
default:
return 0
}
return 0
}
int CGraphicArea::Output() //注意这里
{
cout<<"图形\t"<<"面积"<<endl
switch(type)
{
case Round:
{cout<<"圆\t"break}
case Rect:
{cout<<"矩形\t"break}
case Tri:
{cout<<"三角形\t"break}
case Trap:
{cout<<"梯形\t"break}
case Exit:
exit(1)
default:{
break
}
}
if(area==-1)
cout<<"输入数据错误"<<endl
else
cout<<area<<endl
cout<<"------"<<endl
return 0
}
int main()
{
CGraphicArea *graphic
while(1){
graphic = new CGraphicArea
graphic->Input()
graphic->Handle()
graphic->Output()
graphic->~CGraphicArea()
}
}
这个是圆类package areapublic class Round {private double radius//半径
public Round(){}
public Round(double radius){
this.radius=radius
}
public double getArea(){
return 3.141592653*radius*radius
}
public double getRadius() {
return radius
}
public void setRadius(double radius) {
this.radius = radius
}
public Round compareArea(Round round){
if(this.getArea()>=round.getArea()){
return this
}else
return round
}
}
这个是长方形类package areapublic class Oblang {
private double chang//长方形的长
private double kuan//长方形的宽
public Oblang(){}
public Oblang(double chang,double kuan){
this.chang=chang
this.kuan=kuan
}
/*
* 得到长方形的面积
*/
public double getArea(){
return chang*kuan
}
public double getChang() {
return chang
}
public void setChang(double chang) {
this.chang = chang
}
public double getKuan() {
return kuan
}
public void setKuan(double kuan) {
this.kuan = kuan
}
public Oblang compareArea(Oblang oblang){
if(this.getArea()>=oblang.getArea())
return this
else return oblang
}
}
这个是测试比较package area
public class CompareArea {
public static Object compareArea(Round round,Oblang oblang){
if(round.getArea()>=oblang.getArea())
return round//返回两个面积相比较大的一个的对象
else return oblang
} public static void main(String[] args) {
Oblang oblang1=new Oblang(3,5)
Oblang oblang2=new Oblang(3,8)
Round round1=new Round(3)
Round round2=new Round(5)
oblang1=oblang1.compareArea(oblang2)//得到最大的一个长方形面积对象
round1=round1.compareArea(round2)//得到最大的一个圆面积对象
Object o=compareArea(round1,oblang1)//得到最大的一个面积
Oblang ob
Round r
if(o instanceof Oblang){
ob=(Oblang)o
System.out.println("最大面积是长方形，长方形的长是="+ob.getChang()+"宽="+ob.getKuan()+"面积="+ob.getArea())
}
else if(o instanceof Round) {
r=(Round)o
System.out.println("最大面积是圆，圆的半径是="+r.getRadius()+"面积是="+r.getArea())
}
}}
以上全是我现在做的，可能不是很完善，希望对你有帮助！
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