我正在尝试做简单的集合交集,它工作正常,但是当输出来时,它只显示内存地址或垃圾随机值,帮助我,我应用了断点,但它不工作。实际上我是 C++ 新手
#include<iostream>
using namespace std;
class set
{
private:
int size;
int *elem;
public:
set()
{
size = 0;
elem = NULL;
}
set(int s);
~set();
set(set &s);
set intersection(set A, int z);
void inputset();
void outputset();
};
set::set(int s)
{
size = s;
elem = new int[s];
}
void set::inputset()
{
int i;
cout << "Enter the set Element" << endl;
for(i = 0 ; i < size ; i++)
{
cin >> elem[i];
}
}
set set::intersection(set A, int z)
{
int i, j, k = 0;
set R(z);
for(i = 0; i < size; i++)
{
for(j = 0; j < A.size; j++)
{
if(elem[i] == A.elem[j])
{
R.elem[k] = A.elem[j];
k++;
break;
}
}
}
return R;
}
set::~set()
{
delete []elem;
}
set::set(set &s)
{
int i;
if(size > 0)
{
delete []elem;
}
size = s.size;
elem = new int[size];
for(i = 0; i < size; i++)
{
elem[i] = s.elem[i];
}
}
void set::outputset()
{
int i;
cout << "The elements of new set is : " << endl;
for(i = 0; i < size; i++)
{
cout << elem[i] << endl;
}
cout << endl;
}
int main()
{
int x, y, z;
char choice;
cout << "Enter sizeof set A" << endl;
cin >> x;
set S1(x);
S1.inputset();
S1.outputset();
cout << "Enter sizeof set B" << endl;
cin >> y;
set S2(y);
S2.inputset();
S2.outputset();
z = x + y;
set S3(z);
cout << "Enter I for intersection" << endl << "Enter U for union" << endl << "Enter D for difference" << endl;
cin >> choice;
switch(choice)
{
case'I':
S3 = S1.intersection(S2, z);
S3.outputset();
break;
default:
cout << "Invalid entry";
}
return 0;
}