oop_decorating_3

#include <iostream>
#include <iomanip>
#include <cstdio>
#include <string>
using namespace std;

class Base {
protected:
    Base * obj;
public:
    Base(Base * b): obj(b) {}
    virtual ~Base() {}
    virtual ostream& ins( ostream& os ) const {
        if(obj!= NULL) return obj->ins(os);
        else return os<<"empty";
    }
    virtual bool reg(int fnum, int courseNum, double mark) =0;
    virtual bool decoratedBy(Base * dec) {
        if(obj==NULL) return false;
        if(obj==dec) return true;
        return obj->decoratedBy(dec);
    }
    Base* getOriginal() {
        if(obj==NULL) return this;
        return obj->getOriginal();
    }
};
ostream& operator<<(ostream& os, const Base& obj) {
    return obj.ins(os);
}

Base * courses[8];
Base * getCourse(int n){ return courses[n]; }

class Student: public Base {
    string name;
    int fnum;
    int n;
    double av;
public:
    Student(const string name, int fnum, Base* dec=NULL):
      Base(dec),name(name),fnum(fnum),n(0),av(0.0) {}
    ~Student() {}
    ostream& ins(ostream& os) const {
        os<< name <<",\tF"<< fnum;
        if(n==0)os<<"\tняма положени изпити.";
        else os<<"\tсреден успех: "<<setprecision(2)<<av;
        return os<<endl;
    }
    bool reg(int fnum, int courseNum, double mark) {
        if(fnum!=this->fnum) return false;
        if(!decoratedBy(courses[courseNum])) return false;
        av = (av*n+mark)/(n+1);
        n++;
        return true;
    }
};

class Course: public Base {
    string name;
    int sign;
public:
    Course(const string name, int sign, Base* dec=NULL):
      Base(dec), name(name), sign(sign) {}
    ~Course() {}
    ostream& ins(ostream& os) const {
        os<<"CSCB"<< sign <<" "<< name;
        return os;
    }
    bool reg(int fnum, int courseNum, double m){ return false; }
};

class Choice: public Base {
    int courseNum;
    double mark;
public:
    Choice(int courseNum, Base* dec = NULL):
      Base(dec), courseNum(courseNum), mark(0.) {}
    ~Choice() {}
    ostream& ins(ostream& os) const {
        obj->ins(os);
        os<<'\t';
        courses[courseNum]->ins(os);
        os<<"\n\t\tоценка: ";
        if(mark == 0.) os<<"неположен.";
        else os<<mark;
        return os<<endl;
    }
    bool reg(int fnum, int courseNum, double m) {
        if(obj->reg(fnum, courseNum, m)) {
            if(courseNum == this->courseNum) {
                mark = m;
                return true;
            }
        }return false;
    }
    bool decoratedBy(Base* dec) {
        if(obj == NULL) return false;
        if(dec == courses[courseNum]) return true;
        return obj->decoratedBy(dec);
    }
};

Student * genStudent() {
    static int No = 0;
    char buf[15];
    sprintf(buf,"Student%d", ++No);
    return new Student(buf, 1000+rand()%90000);
}

void fillCourses() {
    courses[0] = new Course("Програмиране с Java", 302 );
    courses[1] = new Course("Основи на математическия анализ", 308);
    courses[2] = new Course("Бази данни и системи за управление на бази данни", 405);
    courses[3] = new Course("Висша математика..", 412);
    courses[4] = new Course("Увод в Microsoft Visual C# .NET", 565);
    courses[5] = new Course("Програмиране с Microsoft Visual C# .NET", 567);
    courses[6] = new Course("Алгоритми и структури данни", 581);
    courses[7] = new Course("Скриптови езици за Интернет (PHP)", 688);
}

void choices(int c[]) {
    int k=0;
    do{
        int t = rand()%8;
        int i=0;
        for(; i<k; i++)if(c[i]==t) break;
        if(i==k){ c[k]=t; k++; }
    }while(k<6);
}

void testDecoration(int n) {
    setlocale(0,"");
    Base ** S;
    S = new Base* [n];

    cout <<"\nСтуденти:\n";
    for(int i=0; i<n; i++) S[i] = genStudent();
    for(int i=0; i<n; i++) cout<<*S[i] << endl;
    system("PAUSE");

    cout <<"\nКурсове:\n";
    for(int i=0; i<8; i++)cout<< *getCourse(i) << endl;
    system("PAUSE");

    int cc[6];
    cout <<"\nИзбрани курсове:\n";
    for(int i=0; i<n; i++) {
        cout <<*S[i] << endl;
        choices(cc);
        for(int k=0; k<6; k++) {
            cout <<'\t'<< *courses[cc[k]] << endl;
            S[i] = new Choice(cc[k],S[i]);
        }
    }
    system("PAUSE");

    cout <<"\nСтуденти с курсове:\n";
    for(int i=0; i<n; i++) {
        cout <<*S[i] << endl;
    }
    system("PAUSE");

    cout<<"\n\tСтуденти по курсове:\n";
    for(int k=0; k<8; k++) {
        cout<<*courses[k]<<endl;
        for(int s=0; s<n; s++) if( S[s]->decoratedBy(courses[k]) )
            cout <<'\t'<<*( S[s]->getOriginal() )<< endl;
    }

    cout<<"F#, C#, mark:";
    int fn, cn;
    double mark;
    cin>> fn >> cn >> mark;
    for( int i=0; i<n; i++) if( S[i]->reg(fn,cn,mark) ) cout << *S[i];
}

int main() {

    fillCourses();
    testDecoration(10);

    system("PAUSE");
    return EXIT_SUCCESS;
}