7_69.cpp

《C++程序设计技能百练》一书的随书光盘内的源代码。

#include<iostream.h>
const int max=100;
class set
{
	int list[max];
	int pc;
public:
	set()
	{
		pc=0;
		cout<<"Constructor called!"<<endl;
	}
	set(int a[],int size)
	{
		if(size>=100)
			pc=100;
		else
			pc=size;
		for(int i=0;i<pc;i++)
			list[i]=a[i];
	}
	set(set& s)
	{
		pc=s.pc;
		for(int i=0;i<pc;i++)
			list[i]=s.list[i];
		cout<<"Copy-initialization Constructor called!"<<endl;
	}
	void empty(){pc=0;}
	bool isempty()
	{
		if(pc==0) 
			return true;
		else 
			return false;
	}
	bool ismemberof(int n)
	{
		for(int i=0;i<pc;i++)
			if(list[i]==n)
				return true;
		return false;
	}
	void add(int n)
	{
		if(ismemberof(n))
		{
			cout<<"The set has included the number!";
			return ;
		}
		else if(pc>max)
		{
			cout<<"The set is full.DO NOT add a number!";
			return;
		}
		else
			list[pc++]=n;
	}
	set intersection(set& SET)
	{
		int a[100],size=0;
		for(int i=0;i<pc;i++)
			for(int j=0;j<SET.pc;j++)
				if(list[i]==SET.list[j])
				{
					a[size++]=list[i];
					break;
				}
		return set(a,size);
	}
	void print()
	{
		cout<<"{";
		for(int i=0;i<pc-1;i++)
			cout<<list[i]<<",";
		if(pc>0)
			cout<<list[pc-1];
		cout<<"}"<<endl;
	}
};
void main()
{
	set A;
	if(A.isempty())
		cout<<"set \'A\' is empty."<<endl;
	else
		cout<<"set \'A\' is not empty."<<endl;
	cout<<"A:";A.print();
    for(int i=1;i<10;i++)
		A.add(i);
	cout<<"A:";A.print();
	set B;
	for(i=1;i<6;i++)
		B.add(i);
	cout<<"B:";B.print();
	B.empty();
    cout<<"B:";B.print();
	for(i=8;i<15;i++)
		B.add(i);
	cout<<"B:";B.print();
	set C(B);
	cout<<"C:";C.print();
	cout<<"A交C:";A.intersection(C).print();
}