程序代码：

#include<iostream.h>

class Myclass
{
private:
    int A,B,C;
    static int sum;
public:
    Myclass(int a,int b,int c)
    {
        A=a;B=b;C=c;
        Myclass::sum=A+B+C;
    }
    void GetNumber();
    void GetSum();
};
void Myclass::GetNumber()
    {
        cout<<"A = "<<A<<"\tB = "<<B<<"\tC = "<<C<<endl;
    }
void Myclass::GetSum()
    {
    cout<<"sum = "<<Myclass::sum<<endl;
    }
int Myclass::sum=0;
void main()
{
    Myclass M(3,7,10),N(14,9,11);
    M.GetSum();
    N.GetSum();
}





为什么结果两个sum都是34