大題：二級C++回顧(一)

從今天開始複習C++了，要把之前的知識都回想起來。

做題庫裏的大題找找感覺

1.基本操作題目

#include<iostream>
using namespace std;

class StudentInfo
{
protected:
  // ERROR **********found**********
  char *Name; 
  int Age; 
  int ID;
  int CourseNum;
  float Record;
public:
  StudentInfo(char *name, int Age, int ID, int courseNum, float record);	
  // ERROR **********found**********
   ~StudentInfo() {}
  float AverageRecord(){
    return Record/CourseNum;
  }
  void show()const{
    cout<<"Name: "<<Name<<"   Age: "<<Age<<"   ID: "<<ID
        <<"   CourseNum: "<<CourseNum<<"   Record: "<<Record<<endl;
  }
};

// ERROR **********found**********
StudentInfo::StudentInfo(char *Name, int Age, int ID, int CourseNum, float Record)
{
  Name = name;
  Age = age;
  this->ID = ID;
  CourseNum = courseNum;
  Record = record;
}

int main()
{
  StudentInfo st("Smith",21,99999,12,970);
  st.show();
  return 0;
}

 

2.簡單應用題

 

#include <iostream>
using namespace std;

class vehicle
{
private:
  int MaxSpeed;
  int Weight;
public:
  //**********found**********
    vehicle(int maxspeed, int weight) :MaxSpeed(maxspeed), Weight(weight) {};
  ~vehicle(){}; 
  int getMaxSpeed() { return MaxSpeed; }
  int getWeight() { return  Weight; }
};

//**********found**********
class bicycle : virtual  public vehicle
{ 
private:
  int Height;
public:
  bicycle(int maxspeed, int weight, int height):vehicle(maxspeed, weight),Height(height){}
  int getHeight(){ return Height; };
};
 
//**********found**********
class motorcar : virtual public vehicle
{ 
private:
  int SeatNum;
public:
  motorcar(int maxspeed, int weight, int seatnum):vehicle(maxspeed, weight),SeatNum(seatnum){}
  int getSeatNum(){ return SeatNum; };
};

//**********found**********
class motorcycle :  public bicycle,public motorcar
{ 
public:
  motorcycle(int maxspeed, int weight, int height):
	  vehicle(maxspeed, weight),bicycle(maxspeed, weight,height),motorcar(maxspeed, weight, 1){}
};

void main()
{
  motorcycle a(80,150,100);
  cout<<a.getMaxSpeed()<<endl;
  cout<<a.getWeight()<<endl;  
  cout<<a.getHeight()<<endl;  
  cout<<a.getSeatNum()<<endl;  
}

3.綜合應用題目

 

#include "CDeepCopy.h"
#include<fstream>
CDeepCopy::~CDeepCopy(){ delete [] p; }
CDeepCopy::CDeepCopy(int k) { n=k; p=new int[n]; } //構造函數實現
CDeepCopy& CDeepCopy::operator=(const CDeepCopy& r)  //賦值運算符函數實現
{
//********333********
    n = r.n;
    delete[]p;
    p = new int[n];
    for (int i = 0;i < n;i++)
        p[i] = r.p[i];
    return *this;

//********666********
}

int main()
{
  CDeepCopy a(2),d(3);
  a.p[0]=1;  d.p[0]=666;            //對象a,d數組元素的賦值
  {  	
    CDeepCopy b(3);
    a.p[0]=88;     b=a;             //調用賦值運算符函數
    cout<<b.p[0];                   //顯示內層局部對象的數組元素  
  }
  cout<<d.p[0];                     //顯示d數組元素a.p[0]的值
  cout<<" d fade away;\n";  cout<<a.p[0];  //顯示a數組元素a.p[0]的值
  writeToFile("");
  return 0;
}

void writeToFile(char *path)
{
	char filename[30];
	strcpy(filename,path);
	strcat(filename,"out.dat");
	ofstream fout(filename);
	 CDeepCopy a(2),b(3),d(3);
	 a.p[0]=1;b.p[0]=66;d.p[0]=222;
	 a=b;
	 fout<<a.p[0];
	 fout<<d.p[0]<<" d fade away;\n"<<b.p[0];



}