2:
#include <iostream>
using namespace std;
class Date
{public:
Date(int,int,int);
Date(int,int);
Date(int);
Date();
void display();
private:
int month;
int day;
int year;
};
Date::Date(int m,int d,int y):month(m),day(d),year(y)
{ }
Date::Date(int m,int d):month(m),day(d)
{year=2005;}
Date::Date(int m):month(m)
{day=1;
year=2005;
}
Date::Date()
{month=1;
day=1;
year=2005;
}
void Date::display()
{cout<<month<<"/"<<day<<"/"<<year<<endl;}
int main()
{
Date d1(10,13,2005);
Date d2(12,30);
Date d3(10);
Date d4;
d1.display();
d2.display();
d3.display();
d4.display();
return 0;
}
3:
#include <iostream>
using namespace std;
class Date
{public:
Date(int=1,int=1,int=2005);
void display();
private:
int month;
int day;
int year;
};
Date::Date(int m,int d,int y):month(m),day(d),year(y)
{ }
void Date::display()
{cout<<month<<"/"<<day<<"/"<<year<<endl;}
int main()
{
Date d1(10,13,2005);
Date d2(12,30);
Date d3(10);
Date d4;
d1.display();
d2.display();
d3.display();
d4.display();
return 0;
}
4:
#include <iostream>
using namespace std;
class Student
{public:
Student(int n,float s):num(n),score(s){}
void display();
private:
int num;
float score;
};
void Student::display()
{cout<<num<<" "<<score<<endl;}
int main()
{Student stud[5]={
Student(101,78.5),Student(102,85.5),Student(103,98.5),
Student(104,100.0),Student(105,95.5)};
Student *p=stud;
for(int i=0;i<=2;p=p+2,i++)
p->display();
return 0;
}
5:
#include <iostream>
using namespace std;
class Student
{public:
Student(int n,float s):num(n),score(s){}
int num;
float score;
};
void main()
{Student stud[5]={
Student(101,78.5),Student(102,85.5),Student(103,98.5),
Student(104,100.0),Student(105,95.5)};
void max(Student* );
Student *p=&stud[0];
max(p);
}
void max(Student *arr)
{float max_score=arr[0].score;
int k=0;
for(int i=1;i<5;i++)
if(arr[i].score>max_score) {max_score=arr[i].score;k=i;}
cout<<arr[k].num<<" "<<max_score<<endl;
}
c++面向对象程序设计
6:
#include <iostream>
using namespace std;
class Student
{public:
Student(int n,float s):num(n),score(s){}
void change(int n,float s) {num=n;score=s;}
void display(){cout<<num<<" "<<score<<endl;}
private:
int num;
float score;
};
int main()
{Student stud(101,78.5);
stud.display();
stud.change(101,80.5);
stud.display();
return 0;
}
c++面向对象程序设计 谭浩强 答案
7: 解法一
#include <iostream>
using namespace std;
class Student
{public:
Student(int n,float s):num(n),score(s){}
void change(int n,float s) {num=n;score=s;}
void display() {cout<<num<<" "<<score<<endl;}
//可改为:void display() const {cout<<num<<" "<<score<<endl;}
private:
int num;
float score;
};
int main()
{const Student
stud(101,78.5);
stud.display();
//stud.change(101,80.5);
stud.display();
return 0;
}
c++面向对象程序设计 谭浩强 答案
解法二：
#include <iostream>
using namespace std;
class Student
{public:
Student(int n,float s):num(n),score(s){}
void change(int n,float s) const {num=n;score=s;}
void display() const {cout<<num<<" "<<score<<endl;}
private:
mutable int num;
mutable float score;
};
int main()
{const Student stud(101,78.5);
stud.display();
stud.change(101,80.5);
stud.display();
return 0;
}
解法三：
#include <iostream>
using namespace std;
class Student
{public:
Student(int n,float s):num(n),score(s){}
void change(int n,float s) {num=n;score=s;}
void display() {cout<<num<<" "<<score<<endl;}
private:
int num;
float score;
};
c++面向对象程序设计 谭浩强 答案
int main()
{Student stud(101,78.5);
Student *p=&stud;
p->display();
p->change(101,80.5);
p->display();
return 0;
}
8：
#include <iostream>
using namespace std;
class Student
{public:
Student(int n,float s):num(n),score(s){}
void change(int n,float s) {num=n;score=s;}
void display() {cout<<num<<" "<<score<<endl;}
private:
int num;
float score;
};
int main()
{Student stud(101,78.5);
void fun(Student&);
fun(stud);
return 0;
}
void fun(Student &stu)
{stu.display();
stu.change(101,80.5);
stu.display();
}
谭浩强
9：
#include <iostream>
using namespace std;
class Product
{public:
Product(int n,int q,float p):num(n),quantity(q),price(p){};
void total();
static float average();
static void display();
private:
int num;
int quantity;
float price;
static float discount;
static float sum;
static int n;
};
void Product::total()
{float rate=1.0;
if(quantity>10) rate=0.98*rate;
sum=sum+quantity*price*rate*(1-discount);
n=n+quantity;
}
void Product::display()
{cout<<sum<<endl;
cout<<average()<<endl;
}
float Product::average()
{return(sum/n);}
float Product::discount=0.05;
float Product::sum=0;
int Product::n=0;
int main()
{
Product Prod[3]={
Product(101,5,23.5),Product(102,12,24.56),Product(103,100,21.5)
};
for(int i=0;i<3;i++)
Prod[i].total();
Product::display();
return 0;
}
c++面向对象程序设计 谭浩强
10：
#include <iostream>
using namespace std;
class Date;
class Time
{public:
Time(int,int,int);
friend void display(const Date &,const Time &);
private:
int hour;
int minute;
int sec;
};
c++面向对象程序设计
Time::Time(int h,int m,int s)
{hour=h;
minute=m;
sec=s;
}
class Date
{public:
Date(int,int,int);
friend void display(const Date &,const Time &);
private:
int month;
int day;
int year;
};
Date::Date(int m,int d,int y)
{month=m;
day=d;
year=y;
}
void display(const Date &d,const Time &t)
{
cout<<d.month<<"/"<<d.day<<"/"<<d.year<<endl;
cout<<t.hour<<":"<<t.minute<<":"<<t.sec<<endl;
}
int main()
{
Time t1(10,13,56);
Date d1(12,25,2004);
display(d1,t1);
return 0;
}
11：
#include <iostream>
using namespace std;
class Time;
class Date
{public:
Date(int,int,int);
friend Time;
private:
int month;
int day;
int year;
};
Date::Date(int m,int d,int y):month(m),day(d),year(y){ }
class Time
{public:
Time(int,int,int);
void display(const Date &);
private:
int hour;
int minute;
int sec;
};
Time::Time(int h,int m,int s):hour(h),minute(m),sec(s){ }
void Time::display(const Date &d)
{
cout<<d.month<<"/"<<d.day<<"/"<<d.year<<endl;
cout<<hour<<":"<<minute<<":"<<sec<<endl;
}
int main()
{
Time t1(10,13,56);
Date d1(12,25,2004);
t1.display(d1);
return 0;
}
12：
#include <iostream>
using namespace std;
template<class numtype>
class Compare
{public:
Compare(numtype a,numtype b);
numtype max();
numtype min();
private:
numtype x,y;
};
template <class numtype>
Compare<numtype>::Compare(numtype a,numtype b)
{x=a;y=b;}
template <class numtype>
numtype Compare<numtype>::max()
{return (x>y)?x:y;}
template <class numtype>
numtype Compare<numtype>::min()
{return (x<y)?x:y;}
int main()
{Compare<int> cmp1(3,7);
cout<<cmp1.max()<<" is the Maximum of two integer numbers."<<endl;
cout<<cmp1.min()<<" is the Minimum of two integer numbers."<<endl<<endl;
Compare<float> cmp2(45.78,93.6);
cout<<cmp2.max()<<" is the Maximum of two float numbers."<<endl;
cout<<cmp2.min()<<" is the Minimum of two float numbers."<<endl<<endl;
Compare<char> cmp3('a','A');
cout<<cmp3.max()<<" is the Maximum of two characters."<<endl;
cout<<cmp3.min()<<" is the Minimum of two characters."<<endl;
return 0;
}