山东理工大学，C++1

4-1 复数类的运算符重载

#include <iostream>#include <algorithm>using namespace std;class Complex{private:    double real;    double imag;public:    Complex()    {        real = 0;        imag = 0;    }    Complex(double r, double i)    {        real = r;        imag = i;    }    Complex complex_add(Complex &c2);    Complex complex_cut(Complex &c3);    void display1();    void display2();};Complex Complex::complex_add(Complex &c2){    Complex c;    c.real = real+c2.real;    c.imag = imag+c2.imag;    return c;}Complex Complex::complex_cut(Complex &c3){    Complex d;    d.real = real-c3.real;    d.imag = imag-c3.imag;    return d;}void Complex::display1(){    cout<<real<<"+"<<imag<<"i"<<endl;}void Complex::display2(){    cout<<real<<imag<<"i"<<endl;}int main(){    Complex c1(3.2, 4.5),c2(8.9, 5.6), c3, c4;    c3 = c1.complex_add(c2);    c4 = c1.complex_cut(c2);    cout<<"a=";c1.display1();    cout<<"b=";c2.display1();    cout<<"a+b=";c3.display1();    cout<<"a-b=";c4.display2();    return 0;}

4-2 电子时钟中的运算符重载

#include <iostream>#include <cstdio>using namespace std;class Time{private:    int hour;    int minute;    int second;public:    Time(int h,int m,int s)    {        hour=h;        minute=m;        second=s;    }    Time operator ++ ();    void display();    int cmp(Time &t);};Time Time::operator ++ ( ){    if(++second>= 60)    {        second-= 60;        if(++minute>= 60)        {            minute-=60;            ++hour;        }    }}void Time::display(){    printf ( "%.2d:%.2d:%.2d\n", hour, minute, second );}int Time::cmp(Time & t){    if(hour>t.hour)        return 0;    else if(hour== t.hour&& minute > t.minute)        return 0;    else if(hour == t.hour && minute == t.minute && second > t.second)        return 0;    else        return 1;}int main(){    int h1,h2,m1,m2,s1,s2;    cin>>h1>>m1>>s1;    cin>>h2>>m2>>s2;    Time t1(h1,m1,s1);    Time t2(h2,m2,s2);    if(!t1.cmp(t2) )    {    cout<<"The begin time is not earlier than the end time!"<<endl;    }    else    {        while(t1.cmp(t2))        {            t1.display();            ++t1;        }    }    return 0;}

面向对象程序设计上机练习十（运算符重载）

#include <iostream>using namespace std;class Complex{public:    Complex(double a=0,double b=0)    {real=a,imag=b;}    Complex operator +(Complex &a)    {        return Complex(a.real+real,a.imag+imag);    }    Complex operator +(int a)    {        return Complex(a+real,imag);    }    friend ostream &operator<<(ostream &o,Complex a)    {        o<<a.real;        if(a.imag>0)  o<<"+";        if(a.imag)  o<<a.imag<<"i";        o<<endl;        return o;    }    friend Complex operator + (int a,Complex &b);private:    double real,imag;};Complex operator + (int a,Complex &b){    return Complex(a+b.real,b.imag);}int main(){    int a,b;    cin>>a>>b;    Complex c1(a,b);    cin>>a>>b;    Complex c2(a,b);    cin>>a;    cout<<c1+c2<<c1+a<<a+c1<<endl;    return 0;}

面向对象程序设计上机练习十一（运算符重载）

#include <iostream>using namespace std;class position{private:    int x1,x2,x3;    int y1,y2,y3;public:    position(int a=0,int b=0,int c=0,int d=0,int e=0,int f=0)    {        x1=a;        x2=b;        x3=c;        y1=d;        y2=e;        y3=f;    }    position operator +(position & r);    friend ostream&operator <<(ostream&, position&);};position position :: operator +(position & r){    position p;    p.x1=x1+r.x1;    p.x2=x2+r.x2;    p.x3=x3+r.x3;    p.y1=y1+r.y1;    p.y2=y2+r.y2;    p.y3=y3+r.y3;    return p;}ostream & operator << (ostream & output, position &r){    output<<r.x1<<" "<<r.x2<<" "<<r.x3<<endl;    output<<r.y1<<" "<<r.y2<<" "<<r.y3;    return output;}int main(){    int a,b,c,d,e,f;    cin>>a>>b>>c>>d>>e>>f;    position r1(a,b,c,d,e,f);        cin>>a>>b>>c>>d>>e>>f;    position r2(a,b,c,d,e,f);        position r3;    r3=r1+r2;    cout<<r3<<endl;    return 0;}

面向对象程序设计上机练习十二（运算符重载）

#include <iostream>#include <bits/stdc++.h>using namespace std;class Complex{    double real,imag;public:    operator double()    {        return real;    }    Complex (double a=0,double b=0)    {        real=a;        imag=b;    }};int main(){    double a,b,c;    cin>>a>>b>>c;    Complex c1(a,b);    double d=c1+c;    cout<<fixed<<setprecision(1)<<d<<endl;    return 0;}

3-1 Point类的构造函数

#include <algorithm>#include <iostream>using namespace std;class point{private:    int x, y;public:    point()    {        x = 0;        y = 0;    }    void showpoint()    {        cout<<"("<<x<<","<<y<<")"<<endl;    }    void show(int a,int b)    {        x = a;        y = b;    }};int main(){    point p;    int a, b;    cin>>a>>b;    p.showpoint();    point p1;    p1.show(a, b);    p1.showpoint();    return 0;}

3-2 构造函数的调用

#include <algorithm>#include <iostream>using namespace std;class point{public:    void show()    {        cout<<"Constructing an object of A"<<endl;    }    ~point()    {        cout<<"Destructing an object of A"<<endl;    }};int main(){    point A, B;    A.show();    B.show();    return 0;}

3-3 构造函数的调用(高级)

#include <algorithm>#include <iostream>using namespace std;class point{public:    void show()    {        cout<<"constructing an object of A"<<endl;    }    ~point()    {        cout<<"Destructing an object of A"<<endl;    }};void display(){    point C;    C.show();}int main(){    cout << "----begin main---" << endl;    point A, B, D;    A.show();    display();    cout << "*******"<<endl;    B.show();    D.show();    cout << "----end main---" << endl;    return 0;}

3-4 计算长方形的周长和面积

#include <iostream>using namespace std;class Rect{    public:    Rect(double L=0,double W=0)    {        Length=L;        Width=W;    }    void f1()    {        cout<<"the length and width of r1 is:"<<Length<<","<<Width<<endl;        cout<<"the perimeter of r1 is:"<<2*(Length+Width)<<endl;        cout<<"the area of r1 is:"<<Length*Width<<endl;    }    void f2()    {        cout<<"the length and width of r2 is:"<<Length<<","<<Width<<endl;        cout<<"the perimeter of r2 is:"<<2*(Length+Width)<<endl;        cout<<"the area of r2 is:"<<Length*Width<<endl;    }    Rect(const Rect &b)    {        Length=b.Length;        Width=b.Width;    }    private:      double Length;      double Width;};int main(){    double a,b;    cin>>a>>b;    if(a<0||b<0)    {        a=0;        b=0;    }    Rect r1(a,b),r2(r1);    r1.f1();    r2.f2();    return 0;}

3-5 学生成绩统计

#include <cstdio>#include <algorithm>#include <iostream>using namespace std;class student{private:char name[50];int num;int math;int eng;int com;public:void set_stu(student p[], int n){int i;for ( i = 0;i < n; i++ )    cin>>p[i].num>>p[i].name>>p[i].math>>p[i].eng>>p[i].com;}int sum(student p){int Sum = 0;Sum = p.math+p.com+p.eng;return Sum;}double ave(int Sum){double Ave;Ave = (double)Sum/(double)3;return Ave;}void Printf(student p[]){cout<<"StuID"<<"\t"<<"Name"<<"\t"<<"Math"<<"\t"<<"Eng"<<"\t"<<"Com"<<"\t"<<"Total"<<"\t"<<"Average"<<endl;int i;for ( i = 0;i < 5; i++ ){int Sum;double Ave;Sum = sum(p[i]);Ave = ave(Sum);cout<<p[i].num<<"\t"<<p[i].name<<"\t"<<p[i].math<<"\t"<<p[i].eng<<"\t"<<p[i].com<<"\t"<<Sum<<"\t";            printf ( "%.1lf\n", Ave );}}};int main(){cout<<"Input the messages of five students(StudentID Name Math English Computer )"<<endl<<endl;student stu[5];stu[5].set_stu(stu, 5);stu[5].Printf(stu);return 0;}

3-6 静态数据成员与静态成员函数

#include <algorithm>#include <iostream>using namespace std;class point{private:    double x, y;    static int count;public:    static void showpoint();    void display()    {        cout<<"Deconstructor point x=" << x << endl;    }    point(double a = 0, double b = 0)    {        count++;        x=a;        y=b;    }};int point::count = 0;void point::showpoint(){    cout << "x=0,Y=0" << endl;    cout << "the number of points is " << count << endl;}int main(){    point a(5), b(3), c(0);    point::showpoint();    a.display();    b.display();    c.display();    return 0;}

3-7 类的友元函数的应用

#include <cstring>#include <cstdio>#include <algorithm>#include <cmath>#include <iostream>using namespace std;class point{private:double x;double y;public:void display2(point &q);void display1(){cout<<" point is the coordinate:X="<<x<<","<<"Y="<<y<<endl;}point(double a, double b){x = a;y = b;}};void point::display2(point &q){    cout<<"The distance between the two points is:"<<sqrt((x-q.x)*(x-q.x)+(y-q.y)*(y-q.y))<<endl;}int main(){double a, b, c, d;cin>>a>>b>>c>>d;point x(a, b);point y(c, d);cout<<"The first";x.display1();cout<<"The second";y.display1();x.display2(y);return 0;}

面向对象程序设计上机练习八（对象数组）

#include <iostream>#include <algorithm>using namespace std;class student{private:    int i;    int num[1000], n;    char name[1000][20];public:    void setint();    void setput();};void student::setint(){    cin>>n;    for ( i = 0; i < n; i++ )    {        cin>>name[i]>>num[i];    }}void student::setput(){    for ( i = 0; i < n; i++ )    {        cout << name[i]<<" "<<num[i]<<endl;    }}int main(){    student t;    t.setint();    t.setput();}

面向对象程序设计上机练习九（对象指针）

#include <iostream>#include <algorithm>using namespace std;class student{private:    int i;    int k;    int num[1000], n;    char name[1000][20];public:    void setint();    void setput();};void student::setint(){    for ( i = 0; i < 5; i++ )    {        cin>>name[i]>>num[i];    }}void student::setput(){    int max = 0;    for ( i = 0; i < 5; i++ )    {        if ( max < num[i] )        {            max = num[i];            k = i;        }    }    cout<<name[k]<<" "<<num[k]<<endl;}int main(){    student t, *p;    p = &t;    (*p).setint();    (*p).setput();    return 0;}