1,P28
#include <iostream.h>
class Student
{
private :
char Name[120];
float TotalMarks;
float NoOfExams;
float Average;
float CalcAverage();
public:
void GetStats();
void ShowStats();
};
float Student::CalcAverage()
{
return(TotalMarks/NoOfExams);
}
void Student::ShowStats()
{
cout<<"學生姓名:"<<Name<<endl;
cout<<"總成績: "<<TotalMarks<<endl;
cout<<"參加考試的數目:"<<NoOfExams<<endl;
cout<<"每門考試的平均成績:"<<Average<<endl;
cout<<endl;
}
void Student::GetStats()
{
cout<<"姓名: ";
cin>>Name;
cout<<"總成績:";
cin>>TotalMarks;
cout<<"考試數目: ";
cin>>NoOfExams;
Average=CalcAverage();
}
int main(void)
{
Student Kerry,Packer;
Kerry.GetStats();
Kerry.ShowStats();
Packer.GetStats();
Packer.ShowStats();
return 0;
}
2,P31
#include <iostream.h>
#include <string.h>
class String
{
private:
char *str;
public:
String()
{
cout<<"調用了默認構造函數。";
}
String(char *s) //構造函數
{
int length=strlen(s);
str=new char[length+1];
strcpy(str,s);
cout<<"第二個構造函數";
}
~String() //析構函數
{
cout<<"調用了默認析構函數";
}
};
int main()
{
String obj;
String obj1("您好");
return 0;
}
3,p33
#include <iostream.h>
class alpha
{
private:
static int count; //靜態數據成員
public:
alpha() //析構函數增加count
{
count++;
}
static void display_count() //靜態成員函數
{
cout<<count;
cout<<endl;
}
};
int alpha::count=0;
int main()
{
alpha::display_count(); //創建任何對象之前
alpha obj1,obj2,obj3;
alpha::display_count(); //創建三個對象之後
return 0;
}
4,P34
#include <iostream.h>
class Person
{
private:
int age;
public:
void display();
};
void Person::display()
{
this->age=25; //與age=25一樣
cout<<this->age; //與cout<<age一樣
cout<<endl;
};
int main()
{
Person Jack;
Jack.display();
return 0;
}
5,P37
#include <Stdio.h>
#include <conio.h>
#include <string.h>
#include <iostream.h>
class Student
{
private:
int RollNum;
char Name[26];
float Marks[7];
float Percent;
public:
float GetDetails();
float PrintDetails();
};
float Student::GetDetails()
{
int ctr=1;
float total=0;
cout<<"充號:";
cin>>RollNum;
cout<<"姓名:";
cin>>Name;
cout<<"成績:";
while(ctr<7)
{
cout<<"請輸入科目"<<ctr<<"獲得的成績:";
cin>>Marks[ctr];
total=total+Marks[ctr];
ctr=ctr+1;
}
Percent=total/6;
return(0);
}
float Student::PrintDetails()
{
cout<<"序號:"<<RollNum;
cout<<endl;
cout<<"姓名:"<<Name;
cout<<endl;
cout<<"平均分:"<<Percent;
cout<<endl;
return(0);
}
int main()
{
Student records[3];
int x=0;
int y=0;
while (x<3)
{
records[x].GetDetails();
x=x+1;
}
while(y<3)
{
records[y].PrintDetails();
y=y+1;
}
return 0;
}
6,P38
#include <iostream.h>
#include <string.h>
class Employee
{
private:
char Name[40];
int Age;
double Salary;
public:
Employee(char *n,int a,double s); //構造函數
void Display();
};
Employee::Employee(char *n,int a,double s)
{
strcpy(Name,n);
Age=a;
Salary=s;
};
void Employee::Display()
{
cout<<Name;
cout<<endl;
cout<<Age;
cout<<endl;
cout<<Salary;
cout<<endl;
}
int main()
{
Employee ManyEmps[3]=
{
Employee("Slaycke xulmbeng",33,96000),
Employee("Peorje Posteau",45,350000),
Employee("Teoberque Jailbird",50,110000)
};
int x=0;
while(x<3)
{
ManyEmps[x].Display();
x=x+1;
}
return 0;
}