C++第三章
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- #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;
- }
第四题
- #include <iostream>
- using namespace std;
- class Student
- {
- public:
- Student(int n,int s):num(n),score(s){}
- void display();
- private:
- int num;
- int score;
- };
- void Student::display()
- {
- cout<<num<<" "<<score<<endl;
- }
- int main()
- {
- Student stud[5]={Student(1,88),Student(2,86),Student(3,90),Student(4,78),Student(5,88)};
- Student *p=stud;
- for(int i=0;i<3;p+=2,i++)
- p->display();
- return 0;
- }
第五题
- #include<iostream>
- using namespace std;
- class Student {
- public:
- Student(int n,int s):num(n),score(s){};
- int num;
- int score;
- };
- void stu_max(Student *p){
- int i=0,k=0,max=p[0].score;
- for(i;i<5;i++){
- if(p[i].score>max)
- {
- max=p[i].score
- ;k++;}
- }
- cout<<"最高分数是"<<p[k].score<<"学号是"<<p[k].num;
- }
- int main(){
- Student std[5]={Student(1,88),Student
- (2,86),Student
- (3,90),Student(4,78),Student(5,88)};
- Student *p=std;
- stu_max(p);
- return 0;
- }
第六题
- #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;
- }
第七题
- #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()
- void display()const
- {
- cout<<num<<" "<<score<<endl;
- }
- private:
- int num;
- float score;
- };
- int main()
- {
- const Student stud(101,78.5);
- stud.display();
- return 0;
- }
- #include <iostream>
- using namespace std;
- class Student
- {
- public:
- Student(int n,float s):num(n),score(s){}
- //void change(int n,float s)
- void change(int n,float s)const
- {
- num=n;
- score=s;
- }
- //void display()
- void display()const
- {
- cout<<num<<" "<<score<<endl;
- }
- private:
- //int num;
- mutable int num;//将变量变为可改变的值
- //float score;
- mutable float score;
- };
- int main()
- {
- //Student stud(101,78.5);
- const Student stud(101,78.5);
- stud.display();
- stud.change(101,80.5);
- stud.display();
- return 0;
- }
- 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);
- Student *p=&stud;
- p->display();
- p->change(101,80.5);
- p->display();
- return 0;
- }
- #include <iostream>
- using namespace std;
- class Student
- {
- public:
- Student(int n,float s):num(n),score(s){}
- //void change(int n,float s)
- void change(int n,float s)const
- {
- num=n;
- score=s;
- }
- //void display()
- void display()const
- {
- cout<<num<<" "<<score<<endl;
- }
- private:
- //int num;
- mutable int num;
- //float score;
- mutable float score;
- };
- int main()
- {
- //Student stud(101,78.5);
- const Student stud(101,78.5);
- stud.display();
- const Student *p = &stud;
- //stud.change(101,80.5);
- p->change(101,80.5);
- //stud.display();
- p->display();
- return 0;
- }
- #include <iostream>
- using namespace std;
- class Student
- {
- public:
- Student(int n,float s):num(n),score(s){}
- //void change(int n,float s)
- void change(int n,float s)const
- {
- num=n;
- score=s;
- }
- //void display()
- void display()const
- {
- cout<<num<<" "<<score<<endl;
- }
- private:
- //int num;
- mutable int num;
- //float score;
- mutable float score;
- };
- int main()
- {
- //Student stud(101,78.5);
- const Student stud(101,78.5);
- stud.display();
- const Student *p = &stud;
- //stud.change(101,80.5);
- p->change(101,80.5);
- //stud.display();
- p->display();
- return 0;
- }
第八题
- #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();
- }
第九题
- #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=rate*0.98;
- 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=0.0;
- 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;
- }
第十题
- #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;
- };
- 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 day;
- int month;
- int year;
- };
- Date::Date(int d,int m,int y)
- {
- day=d;
- month=m;
- year=y;
- }
- void display(const Date &d,const Time &t)
- {
- cout<<d.day<<" "<<d.month<<" "<<d.year<<endl;
- cout<<t.hour<<" "<<t.minute<<" "<<t.sec<<endl;
- }
- int main()
- {
- Time t(10,13,56);
- Date d(10,25,2004);
- display(d,t);
- return 0;
- }
第十一题
- #include <iostream>
- using namespace std;
- class Time;
- class Date
- {
- public:
- Date(int ,int ,int);
- friend Time;
- private:
- int day;
- int month;
- int year;
- };
- Date::Date(int d,int m,int y)
- {
- int day=d;
- int month=m;
- int 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.day<<" "<<d.month<<" "<<d.year<<endl;
- cout<<hour<<" "<<minute<<" "<<sec<<endl;
- }
- int main()
- {
- Time t(10,13,56);
- Date d(12,25,2004);
- t.display(d);
- return 0;
- }
第十二题
- #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()<<"最大."<<endl;
- cout<<cmp1.min()<<"最小."<<endl;
- Compare<float> cmp2(45.78,93.6);
- cout<<cmp2.max()<<"最大."<<endl;
- cout<<cmp2.min()<<"最小."<<endl;
- Compare<char> cmp3('a','A');
- cout<<cmp3.max()<<"最大."<<endl;
- cout<<cmp3.min()<<"最小."<<endl;
- }
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