C++第18章答案

Posted 2021-06-18 自动秃头化

1.

#include<iostream>
using namespace std;
class Complex 
{
public: 
  Complex(){real=imag=0.0;} 
  Complex(double r){real=r;imag=0.0;}
  Complex(double r,double i){real=r;imag=i;}
  Complex operator + (const Complex &c)
  {
     return Complex(real + c.real,imag + c.imag);
  }
  Complex operator - (const Complex &c)
  {
    return Complex(real-c.real,imag-c.imag);
  }
  Complex operator + (double x)
 {
  return Complex(real+x,imag);
 }
  friend Complex operator +(double x,const Complex &c)
  {
     return Complex(c.real + x,c.imag);
  }
 void print()
{
  if(imag<0)
   cout<<real<<imag<<"i"<<endl;
  else
   cout<<real<<"+i"<<imag<<endl;  
}
private: 
 double real; 
 double imag; 
}; 

2.

class RMB{
	public:
		unsigned int  yuan;
		unsigned int jf;
		RMB(){
			yuan=jf=0;
		}
		RMB(unsigned int d,unsigned int c)
		{
		yuan=d+c/100;
		jf=c%100;	
		}
	RMB operator + (const RMB &r)
		{
			unsigned int c=jf+r.jf;
			unsigned int d=yuan+r.yuan+c/100;
			c=c%100;
			return RMB(d,c);
		}
		RMB &operator ++ ();
		friend RMB operator*(const RMB &r,double m)
        {
        	return RMB(r.yuan*m,r.jf*m);
		}
        friend RMB operator*(double m,const RMB &r)
        {
        	return RMB(r.yuan*m,r.jf*m);
		}
		void display(){
			cout<<(yuan+jf/100.0)<<endl;
		}
};
RMB& RMB::operator ++(){
		   if(++jf==100)
		  {
		jf=0;
		   yuan++;
}
return *this;}

3.

#include<iostream>
using namespace std;
class RMB{
	public:
		unsigned int  yuan;
		unsigned int jf;
		double rmb;
		double p;
		double q;
		RMB(){
			yuan=jf=0;
		}
		RMB(double value){
			yuan=value;
			jf=(value-yuan)*100;
		}
		RMB(unsigned int d,unsigned int c)
		{
		yuan=d+c/100;
		jf=c%100;	
		}
         RMB operator+=(const RMB &r){
         	jf=jf+r.jf;
			yuan=yuan+r.yuan+jf/100;
			jf=jf%100;
			return RMB(yuan,jf);
		 }
         RMB operator+=(double x){
        unsigned int m=yuan;
       	   yuan=yuan+x;
           jf=jf+(m+x-yuan)*100; 
	    	return RMB(yuan,jf);
		 }
         RMB operator-=(const RMB &r){
		  yuan=yuan-r.yuan;
	    	q=jf-r.jf;
	    	jf=q;
		return RMB(yuan,jf);
		 }
         RMB operator-=(double x){
          int m=x*100;
         jf=yuan*100+jf-m;
		 yuan=yuan-x;
         return RMB(yuan,jf);
		 }
		void display(){
			p=jf;
			rmb=yuan+p/100;
			cout<<rmb<<endl;
		}
};

4.

#include<iostream>
#include<math.h> 
#include<iomanip>
using namespace std;
const double pi=3.14159;
class Shape{
	public:
	  virtual double Area()=0;
};
class Circle:public Shape{
	public:
		string P;
		double x;
		double y;
		double r;
		Circle(string p,double X,double Y,double R)
		{
			this->P=p;
			x=X;
			y=Y;
			r=R;
		}
		double Area()
		{
		return pi*r*r;	
		}
};
class Rectangle:public Shape{
	public:
		string P;
		double x1;
		double y1;
		double x2;
		double y2;
		double length;
		double width;
		Rectangle(string p,double X1,double Y1,double X2,double Y2)
		{
			this->P=p;
			x1=X1;
			y1=Y1;
			x2=X2;
			y2=Y2;	
		}
		double Area()
		{
         return (x1-x2)*(y1-y2);
		}
};
class Triangle:public Shape{
	public:
	Triangle(string p,double a,double b,double c,double d,double e,double f)
        {
            this->P = p;
            this->x = a;
            this->y = b;
            this->x1 = c;
            this->y1 = d;
            this->x2 = e;
            this->y2 = f;
        }
        double Area()
        {
            double d1,d2,d3;
            d1 = pow((pow(x-x1,2) + pow(y-y1,2)),0.5);
            d2 = pow((pow(x-x2,2) + pow(y-y2,2)),0.5);
            d3 = pow((pow(x1-x2,2) + pow(y1-x2,2)),0.5);
            double p;
            p = (d1 + d2 + d3)/2;
            double out;
            out = pow(p*(p-d1)*(p-d2)*(p-d3),0.5);
            return out;
        }
    private:
        string P;
        double x;
        double y;
        double x1;
        double x2;
        double y1;
        double y2;};
int  main()
{
	string P; 
	double a,b,c,d,e,f;
	int sum;
	cin>>sum;
	Shape *shape[sum];
    for(int i=0;i<sum;i++)
{
	cin>>P;
    if(P=="R")
    {
   	cin>>a>>b>>c>>d;
    shape[i]=new Rectangle(P,a,b,c,d);
}
    else if(P=="C")
	{
     cin>>a>>b>>c;
	shape[i]=new Circle(P,a,b,c);
}
     else if (P=="T")
     {
     cin>>a>>b>>c>>d>>e>>f;
     shape[i]=new Triangle(P,a,b,c,d,e,f);
	 }
     if(i==sum-1)
        {
            double TotleArea=0;
            for(int j = 0;j<sum; j++)
            {
                cout<<shape[j]->Area()<<endl;
                TotleArea += shape[j]->Area();
                delete shape[j];
            } 
            cout<<fixed<<setprecision(5)<<TotleArea<<endl;
        }
    }
}