종합적인.. > C , C++

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// private:  public:

#include<iostream>
#include<conio.h>

using namespace std;

class A
{
int x;
int y;
char yon;
int tot;
public:
A();
void sum();
void disp()
{
cout << x <<" " << yon << " " << y <<" = " << tot <<endl;
}
};

A::A()
{
cout << " x = ";
cin >> x;
cout << " yon = ";
cin >> yon;
fflush(stdin); // 버퍼 삭제
cout << " y = ";
cin >> y;
}

void A::sum()
{
switch(yon)
{
case '+':tot =x + y; break;
case '-':tot =x - y; break;
case '*':tot =x * y; break;
case '/':tot =x / y; break;
case '%':tot =x % y; break;
default : cout << " error .." <<endl;
exit(0);
}
}
void main()
{
A cc;
cc.sum();
cc.disp();

getch();
}