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| #include<iostream>
using namespace std;
class List
{
private:
struct element
{
char* name;
int number;
element *next;
};
element *head;
public:
List();
List operator + (const List &x);
element* getHead() const {return head; }
void insert(char *m, int num);
void removed(int num);
void print();
void move(int num, char *n);
friend List operator -(const List &x, const List &obj);
};
List operator -(const List &x, const List &obj)
{
List *result = new List;
List::element *tmp1 = x.getHead();
while(tmp1)
{
result->insert(tmp1->name,tmp1->number);
tmp1=tmp1->next;
}
List::element *tmp2 = obj.getHead();
while(tmp2)
{
result->move(tmp2->number,tmp2->name);
tmp2 = tmp2->next;
}
return *result;
}
void List::move(int num,char *n)
{
if(!head)
{
cout<<"there is no element exist in the list"<<endl;
}
else
{
while((!strcmp(head->name,n))&&(head->number == num))
{
element *tmp = head;
head = tmp->next;
delete []tmp->name;
delete tmp;
}
{
element *tmp1 = head;
element *tmp2;
while(tmp1->next&& !(tmp1->number == num && !(strcmp(tmp1->name,n))))
{
tmp2 = tmp1->next;
if(tmp1->next->number == num&& !(strcmp(tmp1->next->name,n)))
{
tmp1->next = tmp1->next->next;
delete []tmp2->name;
delete tmp2;
}
else
{
tmp1 = tmp1->next;
}
}
}
}
}
List::List()
{
head = NULL;
cout<<"construction are called "<<endl;
}
List List:: operator + (const List &x)
{
List *result = new List;
element *tmp = this->head;
while (tmp)
{
result->insert(tmp->name, tmp->number);
tmp = tmp->next;
}
element *ptr = x.getHead();
while (ptr)
{
result->insert(ptr->name, ptr->number);
ptr = ptr->next;
}
return *result;
}
void List::insert(char *m, int num)
{
if(!head)
{
head = new element;
head->name = new (char [strlen(m)+1]);
strcpy(head->name,m);
head->number = num;
head->next = NULL;
}
else
{
element *tmp = head;
element *tail;
tail = new element;
tail->name = new (char [strlen(m)+1]);
strcpy(tail->name,m);
tail->number = num;
tail->next = NULL;
if(strcmp(head->name,m) >= 0)
{
head = tail;
tail->next = tmp;
}
else if(!head->next && strcmp(head->name,m) <= 0)
{
head->next = tail;
}
else if(head->next)
{
element *tmp2= head;
element *tmp1 =tmp2->next;
while (tmp1->next)
{
if(strcmp(tmp2->name,m)<=0 &&strcmp(tmp1->name,m)>=0)
{
break;
}
else
{
tmp2 = tmp1;
tmp1 = tmp1->next;
}
}
if(strcmp(tmp2->name,m)<=0 &&strcmp(tmp1->name,m)>=0)
{
tmp2->next = tail;
tail->next = tmp1;
}
else
{
tmp1->next = tail;
}
}
}
}
void List::removed(int num)
{
if(!head)
{
cout<<"there is no element exist in the list"<<endl;
}
else
{
while(head->number == num)
{
element *tmp = head;
head = tmp->next;
delete []tmp->name;
delete tmp;
}
{
element *tmp1 = head;
element *tmp2;
while(tmp1->next&&tmp1->number != num)
{
tmp2 = tmp1->next;
if(tmp1->next->number == num)
{
tmp1->next = tmp1->next->next;
delete []tmp2->name;
delete tmp2;
}
else
{
tmp1 = tmp1->next;
}
}
}
}
}
void List::print()
{
if(!head)
{
cout<<"there is no element exist in this list"<<endl;
}
else
{
element *tmp = head;
while(tmp->next)
{
cout<<tmp->name<<" "<<tmp->number<<endl;
tmp = tmp->next;
}
cout<<tmp->name<<" "<<tmp->number<<endl;
}
}
int main()
{
List A;
A.insert("ala",23);
A.insert("ala",123);
A.insert("ola",13);
A.insert("ela",12);
A.insert("gla",123);
A.insert("hla",123);
A.print();
cout<<"----"<<endl;
List B;
B.insert("ala",23);
B.insert("gla",123);
B.insert("ola",13);
B.insert("rla",12);
B.print();
cout<<"----------"<<endl;
List C;
C = A+B;
C.print();
cout<<"--------"<<endl;
List D;
D = A- B;
D.print();
cout<<"--------"<<endl;
List E;
E= A - A;
E.print();
} |
