对象的初始状态

#include "iostream.h"
class Calculator
{
private:
 int num1,num2,result;
public:
 void add()
    {
 result=num1+num2;
 }
 void display()
 {
 cout<<"结果为："<<result<<endl;
 }
};
void main()
{
Calculator c1;
c1.add();
c1.display();
}